diff --git a/README.md b/README.md
index a1c80a999..00923e748 100644
--- a/README.md
+++ b/README.md
@@ -302,9 +302,10 @@ _Sample keys only works with the [production build](https://hoppscotch.io)._
 ### Local development environment
 
 1. [Clone this repo](https://help.github.com/en/articles/cloning-a-repository) with git.
-2. Install dependencies by running `pnpm install` within the directory that you cloned (probably `hoppscotch`).
-3. Start the development server with `pnpm run dev`.
-4. Open development site by going to [`http://localhost:3000`](http://localhost:3000) in your browser.
+2. Install pnpm using npm by running `npm install -g pnpm`.
+3. Install dependencies by running `pnpm install` within the directory that you cloned (probably `hoppscotch`).
+4. Start the development server with `pnpm run dev`.
+5. Open development site by going to [`http://localhost:3000`](http://localhost:3000) in your browser.
 
 ### Docker compose
 
@@ -323,9 +324,10 @@ docker run --rm --name hoppscotch -p 3000:3000 hoppscotch/hoppscotch:latest
 ## **Releasing**
 
 1. [Clone this repo](https://help.github.com/en/articles/cloning-a-repository) with git.
-2. Install dependencies by running `pnpm install` within the directory that you cloned (probably `hoppscotch`).
-3. Build the release files with `pnpm run generate`.
-4. Find the built project in `packages/hoppscotch-app/dist`.
+2. Install pnpm using npm by running `npm install -g pnpm`.
+3. Install dependencies by running `pnpm install` within the directory that you cloned (probably `hoppscotch`).
+4. Build the release files with `pnpm run generate`.
+5. Find the built project in `packages/hoppscotch-app/dist`.
 
 ## **Contributing**
 
diff --git a/package.json b/package.json
index 3517f7c8a..48689bb09 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,8 @@
     "generate": "pnpm -r do-build-prod",
     "start": "pnpm -r do-prod-start",
     "lintfix": "pnpm -r do-lintfix",
-    "pre-commit": "pnpm -r do-lintfix"
+    "pre-commit": "pnpm -r do-lintfix",
+    "test": "pnpm -r do-test"
   },
   "workspaces": [
     "./packages/*"
diff --git a/packages/hoppscotch-app/components/http/Request.vue b/packages/hoppscotch-app/components/http/Request.vue
index f4b3b14cc..364625146 100644
--- a/packages/hoppscotch-app/components/http/Request.vue
+++ b/packages/hoppscotch-app/components/http/Request.vue
@@ -232,6 +232,7 @@
 
 <script setup lang="ts">
 import { computed, ref, useContext, watch } from "@nuxtjs/composition-api"
+import { isRight } from "fp-ts/lib/Either"
 import {
   updateRESTResponse,
   restEndpoint$,
@@ -303,25 +304,31 @@ watch(loading, () => {
   }
 })
 
-const newSendRequest = () => {
+const newSendRequest = async () => {
   loading.value = true
 
-  subscribeToStream(
-    runRESTRequest$(),
-    (responseState) => {
-      if (loading.value) {
-        // Check exists because, loading can be set to false
-        // when cancelled
-        updateRESTResponse(responseState)
+  // Double calling is because the function returns a TaskEither than should be executed
+  const streamResult = await runRESTRequest$()()
+
+  // TODO: What if stream fetching failed (script execution errors ?) (isLeft)
+  if (isRight(streamResult)) {
+    subscribeToStream(
+      streamResult.right,
+      (responseState) => {
+        if (loading.value) {
+          // Check exists because, loading can be set to false
+          // when cancelled
+          updateRESTResponse(responseState)
+        }
+      },
+      () => {
+        loading.value = false
+      },
+      () => {
+        loading.value = false
       }
-    },
-    () => {
-      loading.value = false
-    },
-    () => {
-      loading.value = false
-    }
-  )
+    )
+  }
 }
 
 const cancelRequest = () => {
diff --git a/packages/hoppscotch-app/helpers/RequestRunner.ts b/packages/hoppscotch-app/helpers/RequestRunner.ts
index 1b7019fb6..62fb0379e 100644
--- a/packages/hoppscotch-app/helpers/RequestRunner.ts
+++ b/packages/hoppscotch-app/helpers/RequestRunner.ts
@@ -1,155 +1,86 @@
 import { Observable } from "rxjs"
 import { filter } from "rxjs/operators"
-import getEnvironmentVariablesFromScript from "./preRequest"
+import { chain, right, TaskEither } from "fp-ts/lib/TaskEither"
+import { pipe } from "fp-ts/lib/function"
+import { runTestScript, TestDescriptor } from "@hoppscotch/js-sandbox"
+import { isRight } from "fp-ts/lib/Either"
+import {
+  getCombinedEnvVariables,
+  getFinalEnvsFromPreRequest,
+} from "./preRequest"
 import { getEffectiveRESTRequest } from "./utils/EffectiveURL"
 import { HoppRESTResponse } from "./types/HoppRESTResponse"
 import { createRESTNetworkRequestStream } from "./network"
-import runTestScriptWithVariables, {
-  transformResponseForTesting,
-} from "./postwomanTesting"
 import { HoppTestData, HoppTestResult } from "./types/HoppTestResult"
+import { isJSONContentType } from "./utils/contenttypes"
 import { getRESTRequest, setRESTTestResults } from "~/newstore/RESTSession"
 
-/**
- * Runs a REST network request along with all the
- * other side processes (like running test scripts)
- */
-export function runRESTRequest$(): Observable<HoppRESTResponse> {
-  const envs = getEnvironmentVariablesFromScript(
-    getRESTRequest().preRequestScript
+const getTestableBody = (res: HoppRESTResponse & { type: "success" }) => {
+  const contentTypeHeader = res.headers.find(
+    (h) => h.value.toLowerCase() === "content-type"
   )
 
-  const effectiveRequest = getEffectiveRESTRequest(getRESTRequest(), {
-    name: "Env",
-    variables: Object.keys(envs).map((key) => {
-      return {
-        key,
-        value: envs[key],
-      }
-    }),
-  })
+  const rawBody = new TextDecoder("utf-8").decode(res.body)
 
-  const stream = createRESTNetworkRequestStream(effectiveRequest)
+  if (!contentTypeHeader || !isJSONContentType(contentTypeHeader.value))
+    return rawBody
 
-  // Run Test Script when request ran successfully
-  const subscription = stream
-    .pipe(filter((res) => res.type === "success"))
-    .subscribe((res) => {
-      const testReport: {
-        report: "" // ¯\_(ツ)_/¯
-        testResults: Array<
-          | {
-              result: "FAIL"
-              message: string
-              styles: { icon: "close"; class: "cl-error-response" }
+  return JSON.parse(rawBody)
+}
+
+export const runRESTRequest$ = (): TaskEither<
+  string,
+  Observable<HoppRESTResponse>
+> =>
+  pipe(
+    getFinalEnvsFromPreRequest(
+      getRESTRequest().preRequestScript,
+      getCombinedEnvVariables()
+    ),
+    chain((envs) => {
+      const effectiveRequest = getEffectiveRESTRequest(getRESTRequest(), {
+        name: "Env",
+        variables: envs,
+      })
+
+      const stream = createRESTNetworkRequestStream(effectiveRequest)
+
+      // Run Test Script when request ran successfully
+      const subscription = stream
+        .pipe(filter((res) => res.type === "success"))
+        .subscribe(async (res) => {
+          if (res.type === "success") {
+            const runResult = await runTestScript(res.req.testScript, {
+              status: res.statusCode,
+              body: getTestableBody(res),
+              headers: res.headers,
+            })()
+
+            // TODO: Handle script executation fails (isLeft)
+            if (isRight(runResult)) {
+              setRESTTestResults(translateToSandboxTestResults(runResult.right))
             }
-          | {
-              result: "PASS"
-              message: string
-              styles: { icon: "check"; class: "success-response" }
-            }
-          | { startBlock: string; styles: { icon: ""; class: "" } }
-          | { endBlock: true; styles: { icon: ""; class: "" } }
-        >
-        errors: [] // ¯\_(ツ)_/¯
-      } = runTestScriptWithVariables(effectiveRequest.testScript, {
-        response: transformResponseForTesting(res),
-      }) as any
 
-      setRESTTestResults(translateToNewTestResults(testReport))
+            subscription.unsubscribe()
+          }
+        })
 
-      subscription.unsubscribe()
+      return right(stream)
     })
+  )
 
-  return stream
-}
-
-function isTestPass(x: any): x is {
-  result: "PASS"
-  styles: { icon: "check"; class: "success-response" }
-} {
-  return x.result !== undefined && x.result === "PASS"
-}
-
-function isTestFail(x: any): x is {
-  result: "FAIL"
-  message: string
-  styles: { icon: "close"; class: "cl-error-response" }
-} {
-  return x.result !== undefined && x.result === "FAIL"
-}
-
-function isStartBlock(
-  x: any
-): x is { startBlock: string; styles: { icon: ""; class: "" } } {
-  return x.startBlock !== undefined
-}
-
-function isEndBlock(
-  x: any
-): x is { endBlock: true; styles: { icon: ""; class: "" } } {
-  return x.endBlock !== undefined
-}
-
-function translateToNewTestResults(testReport: {
-  report: "" // ¯\_(ツ)_/¯
-  testResults: Array<
-    | {
-        result: "FAIL"
-        message: string
-        styles: { icon: "close"; class: "cl-error-response" }
-      }
-    | {
-        result: "PASS"
-        message: string
-        styles: { icon: "check"; class: "success-response" }
-      }
-    | { startBlock: string; styles: { icon: ""; class: "" } }
-    | { endBlock: true; styles: { icon: ""; class: "" } }
-  >
-  errors: [] // ¯\_(ツ)_/¯
-}): HoppTestResult {
-  // Build a stack of test data which we eventually build up based on the results
-  const testsStack: HoppTestData[] = [
-    {
-      description: "root",
-      tests: [],
-      expectResults: [],
-    },
-  ]
-
-  testReport.testResults.forEach((result) => {
-    // This is a test block start, push an empty test to the stack
-    if (isStartBlock(result)) {
-      testsStack.push({
-        description: result.startBlock,
-        tests: [],
-        expectResults: [],
-      })
-    } else if (isEndBlock(result)) {
-      // End of the block, pop the stack and add it as a child to the current stack top
-      const testData = testsStack.pop()!
-      testsStack[testsStack.length - 1].tests.push(testData)
-    } else if (isTestPass(result)) {
-      // A normal PASS expectation
-      testsStack[testsStack.length - 1].expectResults.push({
-        status: "pass",
-        message: result.message,
-      })
-    } else if (isTestFail(result)) {
-      // A normal FAIL expectation
-      testsStack[testsStack.length - 1].expectResults.push({
-        status: "fail",
-        message: result.message,
-      })
+function translateToSandboxTestResults(
+  testDesc: TestDescriptor
+): HoppTestResult {
+  const translateChildTests = (child: TestDescriptor): HoppTestData => {
+    return {
+      description: child.descriptor,
+      expectResults: child.expectResults,
+      tests: child.children.map(translateChildTests),
     }
-  })
-
-  // We should end up with only the root stack entry
-  if (testsStack.length !== 1) throw new Error("Invalid test result structure")
-
+  }
   return {
-    expectResults: testsStack[0].expectResults,
-    tests: testsStack[0].tests,
+    expectResults: testDesc.expectResults,
+    tests: testDesc.children.map(translateChildTests),
   }
 }
diff --git a/packages/hoppscotch-app/helpers/__tests__/postwomanTesting.spec.js b/packages/hoppscotch-app/helpers/__tests__/postwomanTesting.sample
similarity index 100%
rename from packages/hoppscotch-app/helpers/__tests__/postwomanTesting.spec.js
rename to packages/hoppscotch-app/helpers/__tests__/postwomanTesting.sample
diff --git a/packages/hoppscotch-app/helpers/postwomanTesting.ts b/packages/hoppscotch-app/helpers/postwomanTesting.ts
deleted file mode 100644
index 4057e905a..000000000
--- a/packages/hoppscotch-app/helpers/postwomanTesting.ts
+++ /dev/null
@@ -1,321 +0,0 @@
-import { HoppRESTResponse } from "./types/HoppRESTResponse"
-
-const styles = {
-  PASS: { icon: "check", class: "success-response" },
-  FAIL: { icon: "close", class: "cl-error-response" },
-  ERROR: { icon: "close", class: "cl-error-response" },
-}
-
-type TestScriptResponse = {
-  body: any
-  headers: any[]
-  status: number
-
-  __newRes: HoppRESTResponse
-}
-
-type TestScriptVariables = {
-  response: TestScriptResponse
-}
-
-type TestReportStartBlock = {
-  startBlock: string
-}
-
-type TestReportEndBlock = {
-  endBlock: true
-}
-
-type TestReportEntry = {
-  result: "PASS" | "FAIL" | "ERROR"
-  message: string
-  styles: {
-    icon: string
-  }
-}
-
-type TestReport = TestReportStartBlock | TestReportEntry | TestReportEndBlock
-
-export default function runTestScriptWithVariables(
-  script: string,
-  variables?: TestScriptVariables
-) {
-  const pw = {
-    _errors: [],
-    _testReports: [] as TestReport[],
-    _report: "",
-    expect(value: any) {
-      try {
-        return expect(value, this._testReports)
-      } catch (e: any) {
-        pw._testReports.push({
-          result: "ERROR",
-          message: `${e}`,
-          styles: styles.ERROR,
-        })
-      }
-    },
-    test: (descriptor: string, func: () => void) =>
-      test(descriptor, func, pw._testReports),
-    // globals that the script is allowed to have access to.
-  }
-  Object.assign(pw, variables)
-
-  // run pre-request script within this function so that it has access to the pw object.
-  // eslint-disable-next-line no-new-func
-  new Function("pw", script)(pw)
-
-  return {
-    report: pw._report,
-    errors: pw._errors,
-    testResults: pw._testReports,
-  }
-}
-
-function test(
-  descriptor: string,
-  func: () => void,
-  _testReports: TestReport[]
-) {
-  _testReports.push({ startBlock: descriptor })
-  try {
-    func()
-  } catch (e: any) {
-    _testReports.push({ result: "ERROR", message: e, styles: styles.ERROR })
-  }
-  _testReports.push({ endBlock: true })
-
-  // TODO: Organize and generate text report of each {descriptor: true} section in testReports.
-  // add checkmark or x depending on if each testReport is pass=true or pass=false
-}
-
-function expect(expectValue: any, _testReports: TestReport[]) {
-  return new Expectation(expectValue, null, _testReports)
-}
-
-class Expectation {
-  private expectValue: any
-  private not: true | Expectation
-  private _testReports: TestReport[]
-
-  constructor(
-    expectValue: any,
-    _not: boolean | null,
-    _testReports: TestReport[]
-  ) {
-    this.expectValue = expectValue
-    this.not = _not || new Expectation(this.expectValue, true, _testReports)
-    this._testReports = _testReports // this values is used within Test.it, which wraps Expectation and passes _testReports value.
-  }
-
-  private _satisfies(expectValue: any, targetValue?: any): boolean {
-    // Used for testing if two values match the expectation, which could be === OR !==, depending on if not
-    // was used. Expectation#_satisfies prevents the need to have an if(this.not) branch in every test method.
-    // Signature is _satisfies([expectValue,] targetValue): if only one argument is given, it is assumed the targetValue, and expectValue is set to this.expectValue
-    if (!targetValue) {
-      targetValue = expectValue
-      expectValue = this.expectValue
-    }
-    if (this.not === true) {
-      // test the inverse. this.not is always truthly, but an Expectation that is inverted will always be strictly `true`
-      return expectValue !== targetValue
-    } else {
-      return expectValue === targetValue
-    }
-  }
-
-  _fmtNot(message: string) {
-    // given a string with "(not)" in it, replaces with "not" or "", depending if the expectation is expecting the positive or inverse (this._not)
-    if (this.not === true) {
-      return message.replace("(not)", "not ")
-    } else {
-      return message.replace("(not)", "")
-    }
-  }
-
-  _fail(message: string) {
-    return this._testReports.push({
-      result: "FAIL",
-      message,
-      styles: styles.FAIL,
-    })
-  }
-
-  _pass(message: string) {
-    return this._testReports.push({
-      result: "PASS",
-      message,
-      styles: styles.PASS,
-    })
-  }
-
-  // TEST METHODS DEFINED BELOW
-  // these are the usual methods that would follow expect(...)
-  toBe(value: any) {
-    return this._satisfies(value)
-      ? this._pass(
-          this._fmtNot(`${this.expectValue} do (not)match with ${value}`)
-        )
-      : this._fail(
-          this._fmtNot(`Expected ${this.expectValue} (not)to be ${value}`)
-        )
-  }
-
-  toHaveProperty(value: string) {
-    return this._satisfies(
-      Object.prototype.hasOwnProperty.call(this.expectValue, value),
-      true
-    )
-      ? this._pass(
-          this._fmtNot(`${this.expectValue} do (not)have property ${value}`)
-        )
-      : this._fail(
-          this._fmtNot(
-            `Expected object ${this.expectValue} to (not)have property ${value}`
-          )
-        )
-  }
-
-  toBeLevel2xx() {
-    const code = parseInt(this.expectValue, 10)
-    if (Number.isNaN(code)) {
-      return this._fail(
-        `Expected 200-level status but could not parse value ${this.expectValue}`
-      )
-    }
-    return this._satisfies(code >= 200 && code < 300, true)
-      ? this._pass(
-          this._fmtNot(`${this.expectValue} is (not)a 200-level status`)
-        )
-      : this._fail(
-          this._fmtNot(
-            `Expected ${this.expectValue} to (not)be 200-level status`
-          )
-        )
-  }
-
-  toBeLevel3xx() {
-    const code = parseInt(this.expectValue, 10)
-    if (Number.isNaN(code)) {
-      return this._fail(
-        `Expected 300-level status but could not parse value ${this.expectValue}`
-      )
-    }
-    return this._satisfies(code >= 300 && code < 400, true)
-      ? this._pass(
-          this._fmtNot(`${this.expectValue} is (not)a 300-level status`)
-        )
-      : this._fail(
-          this._fmtNot(
-            `Expected ${this.expectValue} to (not)be 300-level status`
-          )
-        )
-  }
-
-  toBeLevel4xx() {
-    const code = parseInt(this.expectValue, 10)
-    if (Number.isNaN(code)) {
-      return this._fail(
-        `Expected 400-level status but could not parse value ${this.expectValue}`
-      )
-    }
-    return this._satisfies(code >= 400 && code < 500, true)
-      ? this._pass(
-          this._fmtNot(`${this.expectValue} is (not)a 400-level status`)
-        )
-      : this._fail(
-          this._fmtNot(
-            `Expected ${this.expectValue} to (not)be 400-level status`
-          )
-        )
-  }
-
-  toBeLevel5xx() {
-    const code = parseInt(this.expectValue, 10)
-    if (Number.isNaN(code)) {
-      return this._fail(
-        `Expected 500-level status but could not parse value ${this.expectValue}`
-      )
-    }
-    return this._satisfies(code >= 500 && code < 600, true)
-      ? this._pass(
-          this._fmtNot(`${this.expectValue} is (not)a 500-level status`)
-        )
-      : this._fail(
-          this._fmtNot(
-            `Expected ${this.expectValue} to (not)be 500-level status`
-          )
-        )
-  }
-
-  toHaveLength(expectedLength: number) {
-    const actualLength = this.expectValue.length
-    return this._satisfies(actualLength, expectedLength)
-      ? this._pass(
-          this._fmtNot(
-            `Length expectation of (not)being ${expectedLength} is kept`
-          )
-        )
-      : this._fail(
-          this._fmtNot(
-            `Expected length to be ${expectedLength} but actual length was ${actualLength}`
-          )
-        )
-  }
-
-  toBeType(expectedType: string) {
-    const actualType = typeof this.expectValue
-    if (
-      ![
-        "string",
-        "boolean",
-        "number",
-        "object",
-        "undefined",
-        "bigint",
-        "symbol",
-        "function",
-      ].includes(expectedType)
-    ) {
-      return this._fail(
-        this._fmtNot(
-          `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"`
-        )
-      )
-    }
-    return this._satisfies(actualType, expectedType)
-      ? this._pass(this._fmtNot(`The type is (not)"${expectedType}"`))
-      : this._fail(
-          this._fmtNot(
-            `Expected type to be "${expectedType}" but actual type was "${actualType}"`
-          )
-        )
-  }
-}
-
-export function transformResponseForTesting(
-  response: HoppRESTResponse
-): TestScriptResponse {
-  if (response.type === "loading") {
-    throw new Error("Cannot transform loading responses")
-  }
-
-  if (response.type === "network_fail") {
-    throw new Error("Cannot transform failed responses")
-  }
-
-  let body: any = new TextDecoder("utf-8").decode(response.body)
-
-  // Try parsing to JSON
-  try {
-    body = JSON.parse(body)
-  } catch (_) {}
-
-  return {
-    body,
-    headers: response.headers,
-    status: response.statusCode,
-
-    __newRes: response,
-  }
-}
diff --git a/packages/hoppscotch-app/helpers/preRequest.ts b/packages/hoppscotch-app/helpers/preRequest.ts
index 48ce28636..984230795 100644
--- a/packages/hoppscotch-app/helpers/preRequest.ts
+++ b/packages/hoppscotch-app/helpers/preRequest.ts
@@ -1,42 +1,29 @@
+import { runPreRequestScript } from "@hoppscotch/js-sandbox"
 import {
   getCurrentEnvironment,
   getGlobalVariables,
 } from "~/newstore/environments"
 
-export default function getEnvironmentVariablesFromScript(script: string) {
-  const _variables: Record<string, string> = {}
+export const getCombinedEnvVariables = () => {
+  const variables: { key: string; value: string }[] = [...getGlobalVariables()]
 
-  const currentEnv = getCurrentEnvironment()
+  for (const variable of getCurrentEnvironment().variables) {
+    const index = variables.findIndex((v) => variable.key === v.key)
 
-  for (const variable of currentEnv.variables) {
-    _variables[variable.key] = variable.value
-  }
-
-  const globalEnv = getGlobalVariables()
-
-  if (globalEnv) {
-    for (const variable of globalEnv) {
-      _variables[variable.key] = variable.value
+    if (index === -1) {
+      variables.push({
+        key: variable.key,
+        value: variable.value,
+      })
+    } else {
+      variables[index].value = variable.value
     }
   }
 
-  try {
-    // the pw object is the proxy by which pre-request scripts can pass variables to the request.
-    // for security and control purposes, this is the only way a pre-request script should modify variables.
-    const pw = {
-      environment: {
-        set: (key: string, value: string) => (_variables[key] = value),
-      },
-      env: {
-        set: (key: string, value: string) => (_variables[key] = value),
-      },
-      // globals that the script is allowed to have access to.
-    }
-
-    // run pre-request script within this function so that it has access to the pw object.
-    // eslint-disable-next-line no-new-func
-    new Function("pw", script)(pw)
-  } catch (_e) {}
-
-  return _variables
+  return variables
 }
+
+export const getFinalEnvsFromPreRequest = (
+  script: string,
+  envs: { key: string; value: string }[]
+) => runPreRequestScript(script, envs)
diff --git a/packages/hoppscotch-app/package.json b/packages/hoppscotch-app/package.json
index 1edef283f..ed34d162a 100644
--- a/packages/hoppscotch-app/package.json
+++ b/packages/hoppscotch-app/package.json
@@ -22,10 +22,12 @@
     "do-dev": "pnpm run dev",
     "do-build-prod": "pnpm run generate",
     "do-prod-start": "pnpm run start",
-    "do-lintfix": "pnpm run lint"
+    "do-lintfix": "pnpm run lint",
+    "do-test": "pnpm run test"
   },
   "dependencies": {
     "@apollo/client": "^3.4.12",
+    "@hoppscotch/js-sandbox": "workspace:^1.0.0",
     "@nuxtjs/axios": "^5.13.6",
     "@nuxtjs/composition-api": "^0.29.0",
     "@nuxtjs/gtm": "^2.4.0",
@@ -41,6 +43,7 @@
     "core-js": "^3.17.3",
     "esprima": "^4.0.1",
     "firebase": "^9.0.2",
+    "fp-ts": "^2.11.3",
     "fuse.js": "^6.4.6",
     "graphql": "^15.5.3",
     "graphql-language-service-interface": "^2.8.4",
diff --git a/packages/hoppscotch-js-sandbox/.eslintrc.js b/packages/hoppscotch-js-sandbox/.eslintrc.js
new file mode 100644
index 000000000..4a403131a
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/.eslintrc.js
@@ -0,0 +1,29 @@
+module.exports = {
+  root: true,
+  env: {
+    node: true,
+    jest: true,
+    browser: true,
+  },
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    sourceType: "module",
+    requireConfigFile: false,
+    ecmaVersion: 2021,
+  },
+  plugins: ["prettier"],
+  extends: [
+    "prettier/prettier",
+    "eslint:recommended",
+    "plugin:prettier/recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:@typescript-eslint/recommended",
+  ],
+  rules: {
+    semi: [2, "never"],
+    "prettier/prettier": ["warn", { semi: false }],
+    "import/no-named-as-default": "off",
+    "no-undef": "off",
+    "@typescript-eslint/no-explicit-any": "off",
+  },
+}
diff --git a/packages/hoppscotch-js-sandbox/.gitignore b/packages/hoppscotch-js-sandbox/.gitignore
new file mode 100644
index 000000000..3ca1e543f
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/.gitignore
@@ -0,0 +1,5 @@
+node_modules
+coverage
+.husky/
+dist
+lib
\ No newline at end of file
diff --git a/packages/hoppscotch-js-sandbox/.prettierignore b/packages/hoppscotch-js-sandbox/.prettierignore
new file mode 100644
index 000000000..fac841ece
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/.prettierignore
@@ -0,0 +1,8 @@
+.dependabot
+.github
+.hoppscotch
+.vscode
+package-lock.json
+node_modules
+dist
+lib
\ No newline at end of file
diff --git a/packages/hoppscotch-js-sandbox/.prettierrc.js b/packages/hoppscotch-js-sandbox/.prettierrc.js
new file mode 100644
index 000000000..a43ab29de
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/.prettierrc.js
@@ -0,0 +1,3 @@
+module.exports = {
+  semi: false,
+}
diff --git a/packages/hoppscotch-js-sandbox/LICENSE b/packages/hoppscotch-js-sandbox/LICENSE
new file mode 100644
index 000000000..81f990d60
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/packages/hoppscotch-js-sandbox/README.md b/packages/hoppscotch-js-sandbox/README.md
new file mode 100644
index 000000000..77b12a755
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/README.md
@@ -0,0 +1,65 @@
+<div align="center">
+  <a href="https://hoppscotch.io">
+    <img
+      src="https://avatars.githubusercontent.com/u/56705483"
+      alt="Hoppscotch Logo"
+      height="64"
+    />
+  </a>
+</div>
+<div align="center">
+
+# Hoppscotch JavaScript Sandbox <font size=2><sup>ALPHA</sup></font>
+
+</div>
+
+This package deals with providing a JavaScript sandbox for executing various security sensitive external scripts.
+
+## Usage
+
+Install the [npm package](https://www.npmjs.com/package/@hoppscotch/js-sandbox).
+
+```
+npm install --save @hoppscotch/js-sandbox
+```
+
+## How does this work?
+
+This package makes use of [quickjs-empscripten](https://www.npmjs.com/package/quickjs-emscripten) for building sandboxes for running external code on Hoppscotch.
+
+Currently implemented sandboxes:
+- Hoppscotch Test Scripts
+
+## Development
+
+1. Clone the repository
+
+```
+git clone https://github.com/hoppscotch/hopp-js-sandbox
+```
+
+2. Install the package dependencies
+
+```
+npm install
+```
+
+3. Try out the demo [`src/demo.ts`](https://github.com/hoppscotch/hopp-js-sandbox/blob/main/src/demo.ts) using:
+
+```
+npm run demo
+```
+
+## Versioning
+This project follows [Semantic Versioning](https://semver.org/) but as the project is still pre-1.0. The code and the public exposed API should not be considered to be fixed and stable. Things can change at any time!
+
+## License
+This project is licensed under the [MIT License](https://opensource.org/licenses/MIT) - see [`LICENSE`](https://github.com/hoppscotch/hopp-js-sandbox/blob/main/LICENSE) for more details.
+
+<div align="center">
+  <br />
+  <br />
+
+  ###### built with ❤︎ by the [Hoppscotch Team](https://github.com/hoppscotch) and [contributors](https://github.com/AndrewBastin/hopp-js-sandbox/graphs/contributors).
+
+</div>
diff --git a/packages/hoppscotch-js-sandbox/jest.config.js b/packages/hoppscotch-js-sandbox/jest.config.js
new file mode 100644
index 000000000..70aa99805
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/jest.config.js
@@ -0,0 +1,6 @@
+export default {
+  preset: "ts-jest",
+  testEnvironment: "node",
+  collectCoverage: true,
+  setupFilesAfterEnv: ['./jest.setup.ts'],
+}
diff --git a/packages/hoppscotch-js-sandbox/jest.setup.ts b/packages/hoppscotch-js-sandbox/jest.setup.ts
new file mode 100644
index 000000000..562234114
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/jest.setup.ts
@@ -0,0 +1 @@
+require('@relmify/jest-fp-ts');
\ No newline at end of file
diff --git a/packages/hoppscotch-js-sandbox/package.json b/packages/hoppscotch-js-sandbox/package.json
new file mode 100644
index 000000000..8122d774e
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/package.json
@@ -0,0 +1,60 @@
+{
+  "name": "@hoppscotch/js-sandbox",
+  "version": "1.0.0",
+  "description": "JavaScript sandboxes for running external scripts used by Hoppscotch clients",
+  "main": "./lib/index.js",
+  "types": "./lib/",
+  "type": "module",
+  "engines": {
+    "node": ">=14",
+    "pnpm": ">=3"
+  },
+  "scripts": {
+    "demo": "esrun src/demo.ts",
+    "lint": "eslint --ext .ts,.js --ignore-path .gitignore",
+    "test": "npx jest",
+    "build": "npx tsc",
+    "clean": "npx tsc --build --clean",
+    "prepublish": "pnpm run build",
+    "do-lintfix": "pnpm run lint",
+    "do-build-prod": "pnpm run build",
+    "do-test": "pnpm run test"
+  },
+  "keywords": [
+    "hoppscotch",
+    "sandbox",
+    "js-sandbox",
+    "apis",
+    "test-runner"
+  ],
+  "author": "The Hoppscotch Team <support@hoppscotch.io> (https://hoppscotch.com/)",
+  "license": "MIT",
+  "dependencies": {
+    "fp-ts": "^2.11.3",
+    "lodash": "^4.17.21",
+    "quickjs-emscripten": "^0.13.0"
+  },
+  "devDependencies": {
+    "@digitak/esrun": "^1.2.4",
+    "@relmify/jest-fp-ts": "^1.1.1",
+    "@types/jest": "^26.0.23",
+    "@types/lodash": "^4.14.173",
+    "@types/node": "^15.12.5",
+    "@typescript-eslint/eslint-plugin": "^4.28.1",
+    "@typescript-eslint/parser": "^4.28.1",
+    "eslint": "^7.29.0",
+    "eslint-config-prettier": "^8.3.0",
+    "eslint-plugin-prettier": "^3.4.0",
+    "io-ts": "^2.2.16",
+    "jest": "^27.0.6",
+    "prettier": "^2.3.2",
+    "pretty-quick": "^3.1.1",
+    "ts-jest": "^27.0.3",
+    "typescript": "^4.3.5"
+  },
+  "jest": {
+    "setupFilesAfterEnv": [
+      "@relmify/jest-fp-ts"
+    ]
+  }
+}
diff --git a/packages/hoppscotch-js-sandbox/src/__tests__/preRequest.spec.ts b/packages/hoppscotch-js-sandbox/src/__tests__/preRequest.spec.ts
new file mode 100644
index 000000000..2910c5d23
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/__tests__/preRequest.spec.ts
@@ -0,0 +1,64 @@
+import { execPreRequestScript } from "../preRequest"
+import "@relmify/jest-fp-ts"
+
+describe("execPreRequestScript", () => {
+  test("returns the updated envirionment properly", () => {
+    return expect(
+      execPreRequestScript(
+        `
+          pw.env.set("bob", "newbob")
+        `,
+        [{ key: "bob", value: "oldbob" }, { key: "foo", value: "bar" }]
+      )()
+    ).resolves.toEqualRight([
+      { key: "bob", value: "newbob" },
+      { key: "foo", value: "bar" }
+    ])
+  })
+
+  test("fails if the key is not a string", () => {
+    return expect(
+      execPreRequestScript(
+        `
+          pw.env.set(10, "newbob")
+        `,
+        [{ key: "bob", value: "oldbob" }, { key: "foo", value: "bar" }]
+      )()
+    ).resolves.toBeLeft()
+  })
+
+  test("fails if the value is not a string", () => {
+    return expect(
+      execPreRequestScript(
+        `
+          pw.env.set("bob", 10)
+        `,
+        [{ key: "bob", value: "oldbob" }, { key: "foo", value: "bar" }]
+      )()
+    ).resolves.toBeLeft()
+  })
+
+  test("fails for invalid syntax", () => {
+    return expect(
+      execPreRequestScript(
+        `
+          pw.env.set("bob", 
+        `,
+        [{ key: "bob", value: "oldbob" }, { key: "foo", value: "bar" }]
+      )()
+    ).resolves.toBeLeft()
+  })
+
+  test("creates new env variable if doesn't exist", () => {
+    return expect(
+      execPreRequestScript(
+        `
+          pw.env.set("foo", "bar")
+        `,
+        []
+      )()
+    ).resolves.toEqualRight(
+      [{ key: "foo", value: "bar" }]
+    )
+  })
+})
\ No newline at end of file
diff --git a/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toBe.spec.ts b/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toBe.spec.ts
new file mode 100644
index 000000000..9b7cccc31
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toBe.spec.ts
@@ -0,0 +1,98 @@
+import { execTestScript, TestResponse } from "../../../test-runner"
+import "@relmify/jest-fp-ts"
+
+const fakeResponse: TestResponse = {
+  status: 200,
+  body: "hoi",
+  headers: []
+}
+
+describe("toBe", () => {
+  describe("general assertion (no negation)", () => {
+    test("expect equals expected passes assertion", () => {
+      return expect(
+        execTestScript(
+          `
+              pw.expect(2).toBe(2)
+          `,
+          fakeResponse
+        )()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{ status: "pass", message: "Expected '2' to be '2'" }],
+        }),
+      ])
+    })
+
+    test("expect not equals expected fails assertion", () => {
+      return expect(
+        execTestScript(
+          `
+              pw.expect(2).toBe(4)
+          `,
+          fakeResponse
+        )()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{ status: "fail", message: "Expected '2' to be '4'" }],
+        }),
+      ])
+    })
+  })
+
+  describe("general assertion (with negation)", () => {
+    test("expect equals expected fails assertion", () => {
+      return expect(
+        execTestScript(
+          `
+            pw.expect(2).not.toBe(2)
+          `,
+          fakeResponse
+        )()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "fail",
+            message: "Expected '2' to not be '2'",
+          }],
+        }),
+      ])
+    })
+
+    test("expect not equals expected passes assertion", () => {
+      return expect(
+        execTestScript(
+          `
+              pw.expect(2).not.toBe(4)
+          `,
+          fakeResponse
+        )()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "pass",
+            message: "Expected '2' to not be '4'",
+          }],
+        }),
+      ])
+    })
+  })
+})
+
+test("strict checks types", () => {
+  return expect(
+    execTestScript(
+      `
+          pw.expect(2).toBe("2")
+        `,
+        fakeResponse
+    )()
+  ).resolves.toEqualRight([
+    expect.objectContaining({
+      expectResults: [{
+        status: "fail",
+        message: "Expected '2' to be '2'",
+      }],
+    }),
+  ])
+})
diff --git a/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toBeLevelxxx.spec.ts b/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toBeLevelxxx.spec.ts
new file mode 100644
index 000000000..46da1de64
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toBeLevelxxx.spec.ts
@@ -0,0 +1,361 @@
+import { execTestScript, TestResponse } from "../../../test-runner"
+import "@relmify/jest-fp-ts"
+
+const fakeResponse: TestResponse = {
+  status: 200,
+  body: "hoi",
+  headers: []
+}
+
+describe("toBeLevel2xx", () => {
+  test("assertion passes for 200 series with no negation", async () => {
+    for (let i = 200; i < 300; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).toBeLevel2xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "pass",
+            message: `Expected '${i}' to be 200-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("assertion fails for non 200 series with no negation", async () => {
+    for (let i = 300; i < 500; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).toBeLevel2xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "fail",
+            message: `Expected '${i}' to be 200-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("give error if the expect value was not a number with no negation", async () => {
+    await expect(
+      execTestScript(`pw.expect("foo").toBeLevel2xx()`, fakeResponse)()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [{
+          status: "error",
+          message: "Expected 200-level status but could not parse value 'foo'",
+        }],
+      })
+    ])
+  })
+
+  test("assertion fails for 200 series with negation", async () => {
+    for (let i = 200; i < 300; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).not.toBeLevel2xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "fail",
+            message: `Expected '${i}' to not be 200-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("assertion passes for non 200 series with negation", async () => {
+    for (let i = 300; i < 500; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).not.toBeLevel2xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "pass",
+            message: `Expected '${i}' to not be 200-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("give error if the expect value was not a number with negation", async () => {
+    await expect(
+      execTestScript(`pw.expect("foo").not.toBeLevel2xx()`, fakeResponse)()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [{
+          status: "error",
+          message: "Expected 200-level status but could not parse value 'foo'",
+        }],
+      })
+    ])
+  })
+})
+
+describe("toBeLevel3xx", () => {
+  test("assertion passes for 300 series with no negation", async () => {
+    for (let i = 300; i < 400; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).toBeLevel3xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "pass",
+            message: `Expected '${i}' to be 300-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("assertion fails for non 300 series with no negation", async () => {
+    for (let i = 400; i < 500; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).toBeLevel3xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "fail",
+            message: `Expected '${i}' to be 300-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("give error if the expect value is not a number without negation", () => {
+    return expect(
+      execTestScript(`pw.expect("foo").toBeLevel3xx()`, fakeResponse)()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [{
+          status: "error",
+          message: "Expected 300-level status but could not parse value 'foo'",
+        }],
+      })
+    ])
+  })
+
+  test("assertion fails for 400 series with negation", async () => {
+    for (let i = 300; i < 400; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).not.toBeLevel3xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "fail",
+            message: `Expected '${i}' to not be 300-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("assertion passes for non 200 series with negation", async () => {
+    for (let i = 400; i < 500; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).not.toBeLevel3xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "pass",
+            message: `Expected '${i}' to not be 300-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("give error if the expect value is not a number with negation", () => {
+    return expect(
+      execTestScript(`pw.expect("foo").not.toBeLevel3xx()`, fakeResponse)()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [{
+          status: "error",
+          message: "Expected 300-level status but could not parse value 'foo'",
+        }]
+      })
+    ])
+  })
+
+})
+
+describe("toBeLevel4xx", () => {
+  test("assertion passes for 400 series with no negation", async () => {
+    for (let i = 400; i < 500; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).toBeLevel4xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "pass",
+            message: `Expected '${i}' to be 400-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("assertion fails for non 400 series with no negation", async () => {
+    for (let i = 500; i < 600; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).toBeLevel4xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "fail",
+            message: `Expected '${i}' to be 400-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("give error if the expected value is not a number without negation", () => {
+    return expect(
+      execTestScript(`pw.expect("foo").toBeLevel4xx()`, fakeResponse)()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [{
+          status: "error",
+          message: "Expected 400-level status but could not parse value 'foo'",
+        }],
+      })
+    ])
+  })
+
+  test("assertion fails for 400 series with negation", async () => {
+    for (let i = 400; i < 500; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).not.toBeLevel4xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "fail",
+            message: `Expected '${i}' to not be 400-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("assertion passes for non 400 series with negation", async () => {
+    for (let i = 500; i < 600; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).not.toBeLevel4xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "pass",
+            message: `Expected '${i}' to not be 400-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("give error if the expected value is not a number with negation", () => {
+    return expect(
+      execTestScript(`pw.expect("foo").not.toBeLevel4xx()`, fakeResponse)()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [{
+          status: "error",
+          message: "Expected 400-level status but could not parse value 'foo'",
+        }],
+      })
+    ])
+  })
+})
+
+describe("toBeLevel5xx", () => {
+  test("assertion passes for 500 series with no negation", async () => {
+    for (let i = 500; i < 600; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).toBeLevel5xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "pass",
+            message: `Expected '${i}' to be 500-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("assertion fails for non 500 series with no negation", async () => {
+    for (let i = 200; i < 500; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).toBeLevel5xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "fail",
+            message: `Expected '${i}' to be 500-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("give error if the expect value is not a number with no negation", () => {
+    return expect(
+      execTestScript(`pw.expect("foo").toBeLevel5xx()`, fakeResponse)()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [{
+          status: "error",
+          message: "Expected 500-level status but could not parse value 'foo'",
+        }],
+      })
+    ])
+  })
+
+  test("assertion fails for 500 series with negation", async () => {
+    for (let i = 500; i < 600; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).not.toBeLevel5xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "fail",
+            message: `Expected '${i}' to not be 500-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("assertion passes for non 500 series with negation", async () => {
+    for (let i = 200; i < 500; i++) {
+      await expect(
+        execTestScript(`pw.expect(${i}).not.toBeLevel5xx()`, fakeResponse)()
+      ).resolves.toEqualRight([
+        expect.objectContaining({
+          expectResults: [{
+            status: "pass",
+            message: `Expected '${i}' to not be 500-level status`,
+          }],
+        }),
+      ])
+    }
+  })
+
+  test("give error if the expect value is not a number with negation", () => {
+    return expect(
+      execTestScript(`pw.expect("foo").not.toBeLevel5xx()`, fakeResponse)()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [{
+          status: "error",
+          message: "Expected 500-level status but could not parse value 'foo'",
+        }],
+      })
+    ])
+  })
+})
\ No newline at end of file
diff --git a/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toBeType.spec.ts b/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toBeType.spec.ts
new file mode 100644
index 000000000..f9c5132d0
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toBeType.spec.ts
@@ -0,0 +1,157 @@
+import { execTestScript, TestResponse } from "../../../test-runner"
+
+const fakeResponse: TestResponse = {
+  status: 200,
+  body: "hoi",
+  headers: []
+}
+
+describe("toBeType", () => {
+  test("asserts true for valid type expectations with no negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect(2).toBeType("number")
+          pw.expect("2").toBeType("string")
+          pw.expect(true).toBeType("boolean")
+          pw.expect({}).toBeType("object")
+          pw.expect(undefined).toBeType("undefined")
+        `, fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "pass", message: `Expected '2' to be type 'number'` }, 
+          { status: "pass", message: `Expected '2' to be type 'string'` },
+          { status: "pass", message: `Expected 'true' to be type 'boolean'` },
+          { status: "pass", message: `Expected '[object Object]' to be type 'object'` }, 
+          { status: "pass", message: `Expected 'undefined' to be type 'undefined'` },
+        ],
+      }),
+    ])
+  })
+
+  test("asserts false for invalid type expectations with no negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect(2).toBeType("string")
+          pw.expect("2").toBeType("number")
+          pw.expect(true).toBeType("string")
+          pw.expect({}).toBeType("number")
+          pw.expect(undefined).toBeType("number")
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "fail", message: `Expected '2' to be type 'string'`},
+          { status: "fail", message: `Expected '2' to be type 'number'`},
+          { status: "fail", message: `Expected 'true' to be type 'string'`},
+          { status: "fail", message: `Expected '[object Object]' to be type 'number'`},
+          { status: "fail", message: `Expected 'undefined' to be type 'number'`},
+        ],
+      }),
+    ])
+  })
+
+  test("asserts false for valid type expectations with negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect(2).not.toBeType("number")
+          pw.expect("2").not.toBeType("string")
+          pw.expect(true).not.toBeType("boolean")
+          pw.expect({}).not.toBeType("object")
+          pw.expect(undefined).not.toBeType("undefined")
+        `, fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "fail", message: `Expected '2' to not be type 'number'` },
+          { status: "fail", message: `Expected '2' to not be type 'string'` },
+          { status: "fail", message: `Expected 'true' to not be type 'boolean'` },
+          { status: "fail", message: `Expected '[object Object]' to not be type 'object'` },
+          { status: "fail", message: `Expected 'undefined' to not be type 'undefined'` },
+        ],
+      }),
+    ])
+  })
+
+  test("asserts true for invalid type expectations with negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect(2).not.toBeType("string")
+          pw.expect("2").not.toBeType("number")
+          pw.expect(true).not.toBeType("string")
+          pw.expect({}).not.toBeType("number")
+          pw.expect(undefined).not.toBeType("number")
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "pass", message: `Expected '2' to not be type 'string'` },
+          { status: "pass", message: `Expected '2' to not be type 'number'` },
+          { status: "pass", message: `Expected 'true' to not be type 'string'` },
+          { status: "pass", message: `Expected '[object Object]' to not be type 'number'` },
+          { status: "pass", message: `Expected 'undefined' to not be type 'number'` },
+        ],
+      }),
+    ])
+  })
+
+  test("gives error for invalid type names without negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect(2).toBeType("foo")
+          pw.expect("2").toBeType("bar")
+          pw.expect(true).toBeType("baz")
+          pw.expect({}).toBeType("qux")
+          pw.expect(undefined).toBeType("quux")
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "error", message: `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"` },
+          { status: "error", message: `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"` },
+          { status: "error", message: `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"` },
+          { status: "error", message: `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"` },
+          { status: "error", message: `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"` },
+        ]
+      })
+    ])
+  })
+
+  test("gives error for invalid type names with negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect(2).not.toBeType("foo")
+          pw.expect("2").not.toBeType("bar")
+          pw.expect(true).not.toBeType("baz")
+          pw.expect({}).not.toBeType("qux")
+          pw.expect(undefined).not.toBeType("quux")
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "error", message: `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"` },
+          { status: "error", message: `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"` },
+          { status: "error", message: `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"` },
+          { status: "error", message: `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"` },
+          { status: "error", message: `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"` },
+        ]
+      })
+    ])
+  })
+})
diff --git a/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toHaveLength.spec.ts b/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toHaveLength.spec.ts
new file mode 100644
index 000000000..1d8db0c85
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/__tests__/testing/expect/toHaveLength.spec.ts
@@ -0,0 +1,157 @@
+import { execTestScript, TestResponse } from "../../../test-runner"
+
+const fakeResponse: TestResponse = {
+  status: 200,
+  body: "hoi",
+  headers: []
+}
+
+describe("toHaveLength", () => {
+  test("asserts true for valid lengths with no negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect([1, 2, 3, 4]).toHaveLength(4)
+          pw.expect([]).toHaveLength(0)
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "pass", message: "Expected the array to be of length '4'" },
+          { status: "pass", message: "Expected the array to be of length '0'"  },
+        ],
+      }),
+    ])
+  })
+
+  test("asserts false for invalid lengths with no negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect([]).toHaveLength(4)
+          pw.expect([1, 2, 3, 4]).toHaveLength(0)
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "fail", message: "Expected the array to be of length '4'" },
+          { status: "fail", message: "Expected the array to be of length '0'" },
+        ],
+      }),
+    ])
+  })
+
+  test("asserts false for valid lengths with negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect([1, 2, 3, 4]).not.toHaveLength(4)
+          pw.expect([]).not.toHaveLength(0)
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "fail", message: "Expected the array to not be of length '4'" },
+          { status: "fail", message: "Expected the array to not be of length '0'" },
+        ],
+      }),
+    ])
+  })
+
+  test("asserts true for invalid lengths with negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect([]).not.toHaveLength(4)
+          pw.expect([1, 2, 3, 4]).not.toHaveLength(0)
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "pass", message: "Expected the array to not be of length '4'" },
+          { status: "pass", message: "Expected the array to not be of length '0'" },
+        ],
+      }),
+    ])
+  })
+
+  test("gives error if not called on an array or a string with no negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect(5).toHaveLength(0)
+          pw.expect(true).toHaveLength(0)
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "error", message: "Expected toHaveLength to be called for an array or string" },
+          { status: "error", message: "Expected toHaveLength to be called for an array or string" },
+        ]
+      })
+    ])
+  })
+
+  test("gives error if not called on an array or a string with negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect(5).not.toHaveLength(0)
+          pw.expect(true).not.toHaveLength(0)
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "error", message: "Expected toHaveLength to be called for an array or string" },
+          { status: "error", message: "Expected toHaveLength to be called for an array or string" },
+        ]
+      })
+    ])
+  })
+
+  test("gives an error if toHaveLength parameter is not a number without negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect([1, 2, 3, 4]).toHaveLength("a")
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "error", message: "Argument for toHaveLength should be a number" },
+        ],
+      })
+    ])
+  })
+
+  test("gives an error if toHaveLength parameter is not a number with negation", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.expect([1, 2, 3, 4]).not.toHaveLength("a")
+        `,
+        fakeResponse
+      )()
+    ).resolves.toEqualRight([
+      expect.objectContaining({
+        expectResults: [
+          { status: "error", message: "Argument for toHaveLength should be a number" },
+        ],
+      })
+    ])
+  })
+})
diff --git a/packages/hoppscotch-js-sandbox/src/__tests__/testing/test-runner.spec.ts b/packages/hoppscotch-js-sandbox/src/__tests__/testing/test-runner.spec.ts
new file mode 100644
index 000000000..dc93bed2b
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/__tests__/testing/test-runner.spec.ts
@@ -0,0 +1,59 @@
+import { execTestScript, TestResponse } from "../../test-runner"
+
+const fakeResponse: TestResponse = {
+  status: 200,
+  body: "hoi",
+  headers: []
+}
+
+describe("execTestScript function behavior", () => {
+  test("returns a resolved promise for a valid test scripts with all green", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.test("Arithmetic operations", () => {
+            const size = 500 + 500;
+            pw.expect(size).toBe(1000);
+            pw.expect(size - 500).toBe(500);
+            pw.expect(size * 4).toBe(4000);
+            pw.expect(size / 4).toBe(250);
+          });
+        `,
+        fakeResponse
+      )()
+    ).resolves.toBeRight();
+  })
+
+  test("resolves for tests with failed expectations", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.test("Arithmetic operations", () => {
+            const size = 500 + 500;
+            pw.expect(size).toBe(1000);
+            pw.expect(size - 500).not.toBe(500);
+            pw.expect(size * 4).toBe(4000);
+            pw.expect(size / 4).not.toBe(250);
+          });
+        `, fakeResponse
+      )()
+    ).resolves.toBeRight()
+  })
+
+  // TODO: We need a more concrete behavior for this
+  test("rejects for invalid syntax on tests", () => {
+    return expect(
+      execTestScript(
+        `
+          pw.test("Arithmetic operations", () => {
+            const size = 500 + 500;
+            pw.expect(size).
+            pw.expect(size - 500).not.toBe(500);
+            pw.expect(size * 4).toBe(4000);
+            pw.expect(size / 4).not.toBe(250);
+          });
+        `, fakeResponse
+      )()
+    ).resolves.toBeLeft()
+  })
+})
diff --git a/packages/hoppscotch-js-sandbox/src/__tests__/utils.spec.ts b/packages/hoppscotch-js-sandbox/src/__tests__/utils.spec.ts
new file mode 100644
index 000000000..50d03fdb5
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/__tests__/utils.spec.ts
@@ -0,0 +1,57 @@
+import { match } from "fp-ts/lib/Either"
+import { pipe } from "fp-ts/lib/function"
+import * as QuickJS from "quickjs-emscripten"
+import { marshalObjectToVM } from "../utils"
+
+let vm: QuickJS.QuickJSVm
+
+beforeAll(async () => {
+  const qjs = await QuickJS.getQuickJS()
+  vm = qjs.createVm()
+})
+
+afterAll(() => {
+  vm.dispose()
+})
+
+describe("marshalObjectToVM", () => {
+
+  test("successfully marshals simple object into the vm", () => {
+    const testObj = {
+      a: 1
+    }
+
+    const objVMHandle: QuickJS.QuickJSHandle | null = pipe(
+      marshalObjectToVM(vm, testObj),
+      match(
+        (e) => null,
+        (result) => result
+      )
+    )
+
+    expect(objVMHandle).not.toBeNull()
+    expect(vm.dump(objVMHandle!)).toEqual(testObj)
+
+    objVMHandle!.dispose()
+  })
+
+  test("fails marshalling cyclic object into vm", () => {
+    const testObj = {
+      a: 1,
+      b: null as any
+    }
+
+    testObj.b = testObj
+
+    const objVMHandle: QuickJS.QuickJSHandle | null = pipe(
+      marshalObjectToVM(vm, testObj),
+      match(
+        (e) => null,
+        (result) => result
+      )
+    )
+
+    expect(objVMHandle).toBeNull()
+  })
+
+})
\ No newline at end of file
diff --git a/packages/hoppscotch-js-sandbox/src/demo.ts b/packages/hoppscotch-js-sandbox/src/demo.ts
new file mode 100644
index 000000000..8723dc608
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/demo.ts
@@ -0,0 +1,55 @@
+import { runTestScript } from "./index"
+import { TestResponse } from "./test-runner"
+
+
+const dummyResponse: TestResponse = {
+  status: 200,
+  body: "hoi",
+  headers: []
+};
+
+// eslint-disable-next-line prettier/prettier
+(async () => {
+  console.dir(
+    await runTestScript(
+      `
+    pw.test("Arithmetic operations and toBe", () => {
+      const size = 500 + 500;
+      pw.expect(size).toBe(1000);
+      pw.expect(size - 500).toBe(500);
+      pw.expect(size * 4).toBe(4000);
+      pw.expect(size / 4).toBe(250);
+    });
+    pw.test("toBeLevelxxx", () => {
+      pw.expect(200).toBeLevel2xx();
+      pw.expect(204).toBeLevel2xx();
+      pw.expect(300).not.toBeLevel2xx();
+      pw.expect(300).toBeLevel3xx();
+      pw.expect(304).toBeLevel3xx();
+      pw.expect(204).not.toBeLevel3xx();
+      pw.expect(401).toBeLevel4xx();
+      pw.expect(404).toBeLevel4xx();
+      pw.expect(204).not.toBeLevel4xx();
+      pw.expect(501).toBeLevel5xx();
+      pw.expect(504).toBeLevel5xx();
+      pw.expect(204).not.toBeLevel5xx();
+    });
+    pw.test("toBeType", () => {
+      pw.expect("hello").toBeType("string");
+      pw.expect(10).toBeType("number");
+      pw.expect(true).toBeType("boolean");
+      pw.expect("deffonotanumber").not.toBeType("number");
+    });
+    pw.test("toHaveLength", () => {
+      const arr = [1, 2, 3];
+      pw.expect(arr).toHaveLength(3);
+      pw.expect(arr).not.toHaveLength(4);
+    });
+    `,
+    dummyResponse
+    ),
+    {
+      depth: 100,
+    }
+  )
+})()
diff --git a/packages/hoppscotch-js-sandbox/src/global.d.ts b/packages/hoppscotch-js-sandbox/src/global.d.ts
new file mode 100644
index 000000000..7a83e2841
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/global.d.ts
@@ -0,0 +1 @@
+import '@relmify/jest-fp-ts';
\ No newline at end of file
diff --git a/packages/hoppscotch-js-sandbox/src/index.ts b/packages/hoppscotch-js-sandbox/src/index.ts
new file mode 100644
index 000000000..1150342fa
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/index.ts
@@ -0,0 +1,26 @@
+import { pipe } from "fp-ts/lib/function"
+import { chain, right } from "fp-ts/lib/TaskEither"
+import { execPreRequestScript } from "./preRequest"
+import { execTestScript, TestResponse, TestDescriptor as _TestDescriptor } from "./test-runner"
+
+export type TestDescriptor = _TestDescriptor
+/**
+ * Executes a given test script on the test-runner sandbox
+ * @param testScript The string of the script to run
+ * @returns A TaskEither with an error message or a TestDescriptor with the final status
+ */
+export const runTestScript = (
+  testScript: string,
+  response: TestResponse
+) => pipe(
+  execTestScript(testScript, response),
+  chain((results) => right(results[0])) // execTestScript returns an array of descriptors with a single element (extract that)
+)
+
+/**
+ * Executes a given pre-request script on the sandbox
+ * @param preRequestScript The script to run
+ * @param env The envirionment variables active
+ * @returns A TaskEither with an error message or an array of the final environments with the all the script values applied
+ */
+export const runPreRequestScript = execPreRequestScript
\ No newline at end of file
diff --git a/packages/hoppscotch-js-sandbox/src/preRequest.ts b/packages/hoppscotch-js-sandbox/src/preRequest.ts
new file mode 100644
index 000000000..ade271980
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/preRequest.ts
@@ -0,0 +1,77 @@
+import { pipe } from "fp-ts/lib/function";
+import { chain, TaskEither, tryCatch, right, left } from "fp-ts/lib/TaskEither";
+import * as qjs from "quickjs-emscripten";
+import clone from "lodash/clone";
+
+type EnvEntry = {
+  key: string;
+  value: string;
+};
+
+export const execPreRequestScript = (
+  preRequestScript: string,
+  env: EnvEntry[]
+): TaskEither<string, EnvEntry[]> => pipe(
+  tryCatch(
+    async () => await qjs.getQuickJS(),
+    (reason) => `QuickJS initialization failed: ${reason}`
+  ),
+  chain(
+    (QuickJS) => {
+      const finalEnv = clone(env)
+
+      const vm = QuickJS.createVm()
+
+      const pwHandle = vm.newObject()
+
+      const envHandle = vm.newObject()
+
+      const envSetFuncHandle = vm.newFunction("set", (keyHandle, valueHandle) => {
+        const key = vm.dump(keyHandle)
+        const value = vm.dump(valueHandle)
+
+        if (typeof key !== "string") return {
+          error: vm.newString("Expected key to be a string") 
+        }
+
+        if (typeof value !== "string") return {
+          error: vm.newString("Expected value to be a string")
+        }
+
+        const keyIndex = finalEnv.findIndex((env) => env.key === key)
+
+        if (keyIndex === -1) {
+          finalEnv.push({ key, value })
+        } else {
+          finalEnv[keyIndex] = { key, value }
+        }
+
+        return {
+          value: vm.undefined
+        }
+      })
+
+      vm.setProp(envHandle, "set", envSetFuncHandle)
+      envSetFuncHandle.dispose()
+
+      vm.setProp(pwHandle, "env", envHandle)
+      envHandle.dispose()
+
+      vm.setProp(vm.global, "pw", pwHandle)
+      pwHandle.dispose()
+
+      const evalRes = vm.evalCode(preRequestScript)
+
+      if (evalRes.error) {
+        const errorData = vm.dump(evalRes.error)
+        evalRes.error.dispose()
+
+        return left(`Script evaluation failed: ${errorData}`)
+      }
+
+      vm.dispose()
+
+      return right(finalEnv)
+    }
+  )
+)
\ No newline at end of file
diff --git a/packages/hoppscotch-js-sandbox/src/test-runner.ts b/packages/hoppscotch-js-sandbox/src/test-runner.ts
new file mode 100644
index 000000000..ed3df1f5a
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/test-runner.ts
@@ -0,0 +1,367 @@
+import { isLeft } from "fp-ts/lib/Either"
+import { pipe } from "fp-ts/lib/function"
+import { TaskEither, tryCatch, chain, right, left } from "fp-ts/lib/TaskEither"
+import * as qjs from "quickjs-emscripten"
+import { marshalObjectToVM } from "./utils"
+
+/**
+ * The response object structure exposed to the test script
+ */
+export type TestResponse = {
+  /** Status Code of the response */
+  status: number,
+  /** List of headers returned */
+  headers: { key: string, value: string }[],
+  /**
+   * Body of the response, this will be the JSON object if it is a JSON content type, else body string
+   */
+  body: string | object
+}
+
+/**
+ * The result of an expectation statement
+ */
+type ExpectResult =
+  | { status: "pass" | "fail" | "error", message: string } // The expectation failed (fail) or errored (error)
+
+/**
+ * An object defining the result of the execution of a
+ * test block
+ */
+export type TestDescriptor = {
+  /**
+   * The name of the test block
+   */
+  descriptor: string
+
+  /**
+   * Expectation results of the test block
+   */
+  expectResults: ExpectResult[]
+
+  /**
+   * Children test blocks (test blocks inside the test block)
+   */
+  children: TestDescriptor[]
+}
+
+/**
+ * Creates an Expectation object for use inside the sandbox
+ * @param vm The QuickJS sandbox VM instance
+ * @param expectVal The expecting value of the expectation
+ * @param negated Whether the expectation is negated (negative)
+ * @param currTestStack The current state of the test execution stack
+ * @returns Handle to the expectation object in VM
+ */
+function createExpectation(
+  vm: qjs.QuickJSVm,
+  expectVal: any,
+  negated: boolean,
+  currTestStack: TestDescriptor[]
+): qjs.QuickJSHandle {
+  const resultHandle = vm.newObject()
+
+  const toBeFnHandle = vm.newFunction("toBe", (expectedValHandle) => {
+    const expectedVal = vm.dump(expectedValHandle)
+
+    let assertion = expectVal === expectedVal
+    if (negated) assertion = !assertion
+
+    if (assertion) {
+      currTestStack[currTestStack.length - 1].expectResults.push({ 
+        status: "pass",
+        message: `Expected '${expectVal}' to${negated ? " not" : ""} be '${expectedVal}'`
+      })
+    } else {
+      currTestStack[currTestStack.length - 1].expectResults.push({
+        status: "fail",
+        message: `Expected '${expectVal}' to${negated ? " not" : ""} be '${expectedVal}'`,
+      })
+    }
+
+    return { value: vm.undefined }
+  })
+
+  const toBeLevel2xxHandle = vm.newFunction("toBeLevel2xx", () => {
+    // Check if the expected value is a number, else it is an error
+    if (typeof expectVal === "number" && !Number.isNaN(expectVal)) {
+      let assertion = expectVal >= 200 && expectVal <= 299
+      if (negated) assertion = !assertion
+
+      if (assertion) {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "pass",
+          message: `Expected '${expectVal}' to${negated ? " not" : ""} be 200-level status`,
+        })
+      } else {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "fail",
+          message:
+            `Expected '${expectVal}' to${negated ? " not" : ""} be 200-level status`,
+        })
+      }
+    } else {
+      currTestStack[currTestStack.length - 1].expectResults.push({
+        status: "error",
+        message: `Expected 200-level status but could not parse value '${expectVal}'`,
+      })
+    }
+
+    return { value: vm.undefined }
+  })
+
+  const toBeLevel3xxHandle = vm.newFunction("toBeLevel3xx", () => {
+    // Check if the expected value is a number, else it is an error
+    if (typeof expectVal === "number" && !Number.isNaN(expectVal)) {
+      let assertion = expectVal >= 300 && expectVal <= 399
+      if (negated) assertion = !assertion
+
+      if (assertion) {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "pass",
+          message: `Expected '${expectVal}' to${negated ? " not" : ""} be 300-level status`,
+        })
+      } else {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "fail",
+          message:
+            `Expected '${expectVal}' to${negated ? " not" : ""} be 300-level status`,
+        })
+      }
+    } else {
+      currTestStack[currTestStack.length - 1].expectResults.push({
+        status: "error",
+        message: `Expected 300-level status but could not parse value '${expectVal}'`,
+      })
+    }
+
+    return { value: vm.undefined }
+  })
+
+  const toBeLevel4xxHandle = vm.newFunction("toBeLevel4xx", () => {
+    // Check if the expected value is a number, else it is an error
+    if (typeof expectVal === "number" && !Number.isNaN(expectVal)) {
+      let assertion = expectVal >= 400 && expectVal <= 499
+      if (negated) assertion = !assertion
+
+      if (assertion) {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "pass",
+          message: `Expected '${expectVal}' to${negated ? " not" : ""} be 400-level status`,
+        })
+      } else {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "fail",
+          message:
+            `Expected '${expectVal}' to${negated ? " not" : ""} be 400-level status`,
+        })
+      }
+    } else {
+      currTestStack[currTestStack.length - 1].expectResults.push({
+        status: "error",
+        message: `Expected 400-level status but could not parse value '${expectVal}'`,
+      })
+    }
+
+    return { value: vm.undefined }
+  })
+
+  const toBeLevel5xxHandle = vm.newFunction("toBeLevel5xx", () => {
+    // Check if the expected value is a number, else it is an error
+    if (typeof expectVal === "number" && !Number.isNaN(expectVal)) {
+      let assertion = expectVal >= 500 && expectVal <= 599
+      if (negated) assertion = !assertion
+
+      if (assertion) {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "pass",
+          message: `Expected '${expectVal}' to${negated ? " not" : ""} be 500-level status`,
+        })
+      } else {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "fail",
+          message: `Expected '${expectVal}' to${negated ? " not" : ""} be 500-level status`
+        })
+      }
+    } else {
+      currTestStack[currTestStack.length - 1].expectResults.push({
+        status: "error",
+        message: `Expected 500-level status but could not parse value '${expectVal}'`,
+      })
+    }
+    
+    return { value: vm.undefined }
+  })
+
+  const toBeTypeHandle = vm.newFunction("toBeType", (expectedValHandle) => {
+    const expectedType = vm.dump(expectedValHandle)
+
+    // Check if the expectation param is a valid type name string, else error
+    if (["string", "boolean", "number", "object", "undefined", "bigint", "symbol", "function"].includes(expectedType)) {
+      let assertion = typeof expectVal === expectedType
+      if (negated) assertion = !assertion
+
+      if (assertion) {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "pass",
+          message: `Expected '${expectVal}' to${negated ? " not" : ""} be type '${expectedType}'`
+        })
+      } else {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "fail",
+          message: `Expected '${expectVal}' to${negated ? " not" : ""} be type '${expectedType}'`,
+        })
+      }
+    } else {
+      currTestStack[currTestStack.length - 1].expectResults.push({
+        status: "error",
+        message: `Argument for toBeType should be "string", "boolean", "number", "object", "undefined", "bigint", "symbol" or "function"`
+      })
+    }
+
+    return { value: vm.undefined }
+  })
+
+  const toHaveLengthHandle = vm.newFunction(
+    "toHaveLength",
+    (expectedValHandle) => {
+      const expectedLength = vm.dump(expectedValHandle)
+
+      if (!(Array.isArray(expectVal) || typeof expectVal === "string")) {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "error",
+          message: `Expected toHaveLength to be called for an array or string`,
+        })
+
+        return { value: vm.undefined }
+      }
+
+      // Check if the parameter is a number, else error
+      if (typeof expectedLength === "number" && !Number.isNaN(expectedLength)) {
+        let assertion = (expectVal as any[]).length === expectedLength
+        if (negated) assertion = !assertion
+        
+        if (assertion) {
+          currTestStack[currTestStack.length - 1].expectResults.push({
+            status: "pass",
+            message: `Expected the array to${negated ? " not" : ""} be of length '${expectedLength}'`,
+          })
+        } else {
+          currTestStack[currTestStack.length - 1].expectResults.push({
+            status: "fail",
+            message: `Expected the array to${negated ? " not" : ""} be of length '${expectedLength}'`
+          })
+        }
+      } else {
+        currTestStack[currTestStack.length - 1].expectResults.push({
+          status: "error",
+          message: `Argument for toHaveLength should be a number`
+        })
+      }
+      
+      return { value: vm.undefined }
+    }
+  )
+
+  vm.setProp(resultHandle, "toBe", toBeFnHandle)
+  vm.setProp(resultHandle, "toBeLevel2xx", toBeLevel2xxHandle)
+  vm.setProp(resultHandle, "toBeLevel3xx", toBeLevel3xxHandle)
+  vm.setProp(resultHandle, "toBeLevel4xx", toBeLevel4xxHandle)
+  vm.setProp(resultHandle, "toBeLevel5xx", toBeLevel5xxHandle)
+  vm.setProp(resultHandle, "toBeType", toBeTypeHandle)
+  vm.setProp(resultHandle, "toHaveLength", toHaveLengthHandle)
+
+  vm.defineProp(resultHandle, "not", {
+    get: () => {
+      return createExpectation(vm, expectVal, !negated, currTestStack)
+    },
+  })
+
+  toBeFnHandle.dispose()
+  toBeLevel2xxHandle.dispose()
+  toBeLevel3xxHandle.dispose()
+  toBeLevel4xxHandle.dispose()
+  toBeLevel5xxHandle.dispose()
+  toBeTypeHandle.dispose()
+  toHaveLengthHandle.dispose()
+
+  return resultHandle
+}
+
+export const execTestScript = (
+  testScript: string,
+  response: TestResponse
+): TaskEither<string, TestDescriptor[]> => pipe(
+  tryCatch(
+    async () => await qjs.getQuickJS(),
+    (reason) => `QuickJS initialization failed: ${reason}`
+  ),
+  chain(
+    // TODO: Make this more functional ?
+    (QuickJS) => {
+      const vm = QuickJS.createVm()
+
+      const pwHandle = vm.newObject()
+
+      const testRunStack: TestDescriptor[] = [
+        { descriptor: "root", expectResults: [], children: [] },
+      ]
+
+      const testFuncHandle = vm.newFunction(
+        "test",
+        (descriptorHandle, testFuncHandle) => {
+          const descriptor = vm.getString(descriptorHandle)
+
+          testRunStack.push({
+            descriptor,
+            expectResults: [],
+            children: [],
+          })
+
+          const result = vm.unwrapResult(vm.callFunction(testFuncHandle, vm.null))
+          result.dispose()
+
+          const child = testRunStack.pop() as TestDescriptor
+          testRunStack[testRunStack.length - 1].children.push(child)
+        }
+      )
+
+      const expectFnHandle = vm.newFunction("expect", (expectValueHandle) => {
+        const expectVal = vm.dump(expectValueHandle)
+
+        return {
+          value: createExpectation(vm, expectVal, false, testRunStack),
+        }
+      })
+
+      // Marshal response object
+      const responseObjHandle = marshalObjectToVM(vm, response)
+      if (isLeft(responseObjHandle)) return left(`Response marshalling failed: ${responseObjHandle.left}`)
+
+      vm.setProp(pwHandle, "response", responseObjHandle.right)
+      responseObjHandle.right.dispose()
+
+      vm.setProp(pwHandle, "expect", expectFnHandle)
+      expectFnHandle.dispose()
+
+      vm.setProp(pwHandle, "test", testFuncHandle)
+      testFuncHandle.dispose()
+
+      vm.setProp(vm.global, "pw", pwHandle)
+      pwHandle.dispose()
+
+      const evalRes = vm.evalCode(testScript)
+
+      if (evalRes.error) {
+        const errorData = vm.dump(evalRes.error)
+        evalRes.error.dispose()
+
+        return left(`Script evaluation failed: ${errorData}`)
+      }
+
+      vm.dispose()
+
+      return right(testRunStack)
+    }
+  )
+)
\ No newline at end of file
diff --git a/packages/hoppscotch-js-sandbox/src/utils.ts b/packages/hoppscotch-js-sandbox/src/utils.ts
new file mode 100644
index 000000000..854786e45
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/src/utils.ts
@@ -0,0 +1,32 @@
+import { Either, left, right } from "fp-ts/lib/Either";
+import * as QuickJS from "quickjs-emscripten";
+
+export function marshalObjectToVM(vm: QuickJS.QuickJSVm, obj: object): Either<string, QuickJS.QuickJSHandle> {
+  let jsonString
+
+  try {
+    jsonString = JSON.stringify(obj)
+  } catch (e) {
+    return left("Marshaling stringification failed")
+  }
+
+  const vmStringHandle = vm.newString(jsonString)
+
+  const jsonHandle = vm.getProp(vm.global, "JSON")
+  const parseFuncHandle = vm.getProp(jsonHandle, "parse")
+
+  const parseResultHandle = vm.callFunction(parseFuncHandle, vm.undefined, vmStringHandle)
+
+  if (parseResultHandle.error) {
+    parseResultHandle.error.dispose()
+    return left("Marshaling failed")
+  }
+
+  const resultHandle = vm.unwrapResult(parseResultHandle)
+
+  vmStringHandle.dispose()
+  parseFuncHandle.dispose()
+  jsonHandle.dispose()
+  
+  return right(resultHandle)
+}
\ No newline at end of file
diff --git a/packages/hoppscotch-js-sandbox/tsconfig.json b/packages/hoppscotch-js-sandbox/tsconfig.json
new file mode 100644
index 000000000..a84a776b0
--- /dev/null
+++ b/packages/hoppscotch-js-sandbox/tsconfig.json
@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "target": "ES6",
+    "module": "ESNext",
+    "moduleResolution": "Node",
+    "lib": ["ESNext", "ESNext.AsyncIterable", "DOM"],
+    "esModuleInterop": true,
+    "strict": true,
+    "paths": {
+      "~/*": ["./src/*"],
+      "@/*": ["./src/*"]
+    },
+    "types": [
+      "@types/node",
+      "@types/jest",
+      "@relmify/jest-fp-ts"
+    ],
+    "outDir": "./lib/",
+    "rootDir": "./src/",
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true
+  },
+  "include": ["./src", "./src/global.d.ts"],
+  "exclude": ["node_modules", "./src/__tests__", "./src/demo.ts"]
+}
\ No newline at end of file
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index dcbfb660b..a3d0845dc 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -22,6 +22,7 @@ importers:
       '@babel/preset-env': ^7.15.6
       '@commitlint/cli': ^13.1.0
       '@commitlint/config-conventional': ^13.1.0
+      '@hoppscotch/js-sandbox': workspace:^1.0.0
       '@nuxt/types': ^2.15.8
       '@nuxt/typescript-build': ^2.1.0
       '@nuxtjs/axios': ^5.13.6
@@ -63,6 +64,7 @@ importers:
       eslint-plugin-vue: ^7.18.0
       esprima: ^4.0.1
       firebase: ^9.0.2
+      fp-ts: ^2.11.3
       fuse.js: ^6.4.6
       graphql: ^15.5.3
       graphql-language-service-interface: ^2.8.4
@@ -104,6 +106,7 @@ importers:
       yargs-parser: ^20.2.9
     dependencies:
       '@apollo/client': 3.4.12_graphql@15.5.3
+      '@hoppscotch/js-sandbox': link:../hoppscotch-js-sandbox
       '@nuxtjs/axios': 5.13.6
       '@nuxtjs/composition-api': 0.29.0_nuxt@2.15.8
       '@nuxtjs/gtm': 2.4.0
@@ -119,6 +122,7 @@ importers:
       core-js: 3.17.3
       esprima: 4.0.1
       firebase: 9.0.2
+      fp-ts: 2.11.3
       fuse.js: 6.4.6
       graphql: 15.5.3
       graphql-language-service-interface: 2.8.4_graphql@15.5.3
@@ -190,6 +194,49 @@ importers:
       vue-jest: 3.0.7_babel-core@7.0.0-bridge.0
       worker-loader: 3.0.8
 
+  packages/hoppscotch-js-sandbox:
+    specifiers:
+      '@digitak/esrun': ^1.2.4
+      '@relmify/jest-fp-ts': ^1.1.1
+      '@types/jest': ^26.0.23
+      '@types/lodash': ^4.14.173
+      '@types/node': ^15.12.5
+      '@typescript-eslint/eslint-plugin': ^4.28.1
+      '@typescript-eslint/parser': ^4.28.1
+      eslint: ^7.29.0
+      eslint-config-prettier: ^8.3.0
+      eslint-plugin-prettier: ^3.4.0
+      fp-ts: ^2.11.3
+      io-ts: ^2.2.16
+      jest: ^27.0.6
+      lodash: ^4.17.21
+      prettier: ^2.3.2
+      pretty-quick: ^3.1.1
+      quickjs-emscripten: ^0.13.0
+      ts-jest: ^27.0.3
+      typescript: ^4.3.5
+    dependencies:
+      fp-ts: 2.11.3
+      lodash: 4.17.21
+      quickjs-emscripten: 0.13.0
+    devDependencies:
+      '@digitak/esrun': 1.2.7
+      '@relmify/jest-fp-ts': 1.1.1_fp-ts@2.11.3+io-ts@2.2.16
+      '@types/jest': 26.0.24
+      '@types/lodash': 4.14.173
+      '@types/node': 15.14.9
+      '@typescript-eslint/eslint-plugin': 4.31.1_e2d3c88d378335c4183365c112128ce9
+      '@typescript-eslint/parser': 4.31.1_eslint@7.32.0+typescript@4.4.3
+      eslint: 7.32.0
+      eslint-config-prettier: 8.3.0_eslint@7.32.0
+      eslint-plugin-prettier: 3.4.1_6e975bd57c7acf028c1a9ddbbf60c898
+      io-ts: 2.2.16_fp-ts@2.11.3
+      jest: 27.2.0
+      prettier: 2.4.1
+      pretty-quick: 3.1.1_prettier@2.4.1
+      ts-jest: 27.0.5_bd302350a23170fc0ef61cbda3ff9f29
+      typescript: 4.4.3
+
 packages:
 
   /@antfu/utils/0.2.4:
@@ -1706,6 +1753,21 @@ packages:
     engines: {node: '>=4.0.0'}
     dev: false
 
+  /@digitak/esrun/1.2.7:
+    resolution: {integrity: sha512-G+4t0LvYDS684U/9uOaaOb3Qvqiju2oMK/JIk9liENtDswTxwFVnpIG5vpmszIQkuexcfGGN09VJS1mkrmmPJQ==}
+    engines: {node: '>=14.0'}
+    hasBin: true
+    dependencies:
+      '@digitak/grubber': 1.0.2
+      anymatch: 3.1.2
+      chokidar: 3.5.2
+      esbuild: 0.12.28
+    dev: true
+
+  /@digitak/grubber/1.0.2:
+    resolution: {integrity: sha512-cufCjWJh9MEsdMZgg4MAyUYtLdwboyiqIYir+/zroxWQ9XFqrYLin/tj1eJuH3UyW2qoy5RWXF4TbteDZ3zd7Q==}
+    dev: true
+
   /@endemolshinegroup/cosmiconfig-typescript-loader/1.0.2_4f9b016a9697d58bd127ac5ffca32a8d:
     resolution: {integrity: sha512-ZHkXKq2XFFmAUdmSZrmqUSIrRM4O9gtkdpxMmV+LQl7kScUnbo6pMnXu6+FTDgZ12aW6SDoZoOJfS56WD+Eu6A==}
     engines: {node: '>=8.0.0', yarn: '>=1.3.0'}
@@ -2834,6 +2896,17 @@ packages:
       - supports-color
     dev: true
 
+  /@jest/types/26.6.2:
+    resolution: {integrity: sha512-fC6QCp7Sc5sX6g8Tvbmj4XUTbyrik0akgRy03yjXbQaBWWNWGE7SGtJk98m0N8nzegD/7SggrUlivxo5ax4KWQ==}
+    engines: {node: '>= 10.14.2'}
+    dependencies:
+      '@types/istanbul-lib-coverage': 2.0.3
+      '@types/istanbul-reports': 3.0.1
+      '@types/node': 16.9.2
+      '@types/yargs': 15.0.14
+      chalk: 4.1.2
+    dev: true
+
   /@jest/types/27.1.1:
     resolution: {integrity: sha512-yqJPDDseb0mXgKqmNqypCsb85C22K1aY5+LUxh7syIM9n/b0AsaltxNy+o6tt29VcfGDpYEve175bm3uOhcehA==}
     engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
@@ -3735,6 +3808,19 @@ packages:
     resolution: {integrity: sha1-p3c2C1s5oaLlEG+OhY8v0tBgxXA=}
     dev: false
 
+  /@relmify/jest-fp-ts/1.1.1_fp-ts@2.11.3+io-ts@2.2.16:
+    resolution: {integrity: sha512-cuYK27gjDoEZIzvUuLRvgmqp/t5BlGWMrsVj+kzGlsgYny9xYCAMMRBd38HcFciG6aVTVKrLKqsYNidvU+4vzA==}
+    peerDependencies:
+      fp-ts: 2.x
+      io-ts: 2.x
+    dependencies:
+      expect: 26.6.2
+      fp-ts: 2.11.3
+      io-ts: 2.2.16_fp-ts@2.11.3
+      jest-get-type: 26.3.0
+      jest-matcher-utils: 26.6.2
+    dev: true
+
   /@samverschueren/stream-to-observable/0.3.1_rxjs@6.6.7:
     resolution: {integrity: sha512-c/qwwcHyafOQuVQJj0IlBjf5yYgBI7YPJ77k4fOJYesb41jio65eaJODRUmfYKhTOFBrIZ66kgvGPlNbjuoRdQ==}
     engines: {node: '>=6'}
@@ -4079,6 +4165,13 @@ packages:
       '@types/istanbul-lib-report': 3.0.0
     dev: true
 
+  /@types/jest/26.0.24:
+    resolution: {integrity: sha512-E/X5Vib8BWqZNRlDxj9vYXhsDwPYbPINqKF9BsnSoon4RQ0D9moEuLD8txgyypFLH7J4+Lho9Nr/c8H0Fi+17w==}
+    dependencies:
+      jest-diff: 26.6.2
+      pretty-format: 26.6.2
+    dev: true
+
   /@types/jest/27.0.1:
     resolution: {integrity: sha512-HTLpVXHrY69556ozYkcq47TtQJXpcWAWfkoqz+ZGz2JnmZhzlRjprCIyFnetSy8gpDWwTTGBcRVv1J1I1vBrHw==}
     dependencies:
@@ -4175,6 +4268,10 @@ packages:
     resolution: {integrity: sha512-hcTWqk7DR/HrN9Xe7AlJwuCaL13Vcd9/g/T54YrJz4Q3ESM5mr33YCzW2bOfzSIc3aZMeGBvbLGvgN6mIJ0I5Q==}
     dev: false
 
+  /@types/node/15.14.9:
+    resolution: {integrity: sha512-qjd88DrCxupx/kJD5yQgZdcYKZKSIGBVDIBE1/LTGcNm3d2Np/jxojkdePDdfnBHJc5W7vSMpbJ1aB7p/Py69A==}
+    dev: true
+
   /@types/node/16.9.2:
     resolution: {integrity: sha512-ZHty/hKoOLZvSz6BtP1g7tc7nUeJhoCf3flLjh8ZEv1vFKBWHXcnMbJMyN/pftSljNyy0kNW/UqI3DccnBnZ8w==}
 
@@ -4372,6 +4469,12 @@ packages:
     resolution: {integrity: sha512-7tFImggNeNBVMsn0vLrpn1H1uPrUBdnARPTpZoitY37ZrdJREzf7I16tMrlK3hen349gr1NYh8CmZQa7CTG6Aw==}
     dev: true
 
+  /@types/yargs/15.0.14:
+    resolution: {integrity: sha512-yEJzHoxf6SyQGhBhIYGXQDSCkJjB6HohDShto7m8vaKg9Yp0Yn8+71J9eakh2bnPg6BfsH9PRMhiRTZnd4eXGQ==}
+    dependencies:
+      '@types/yargs-parser': 20.2.1
+    dev: true
+
   /@types/yargs/16.0.4:
     resolution: {integrity: sha512-T8Yc9wt/5LbJyCaLiHPReJa0kApcIgJ7Bn735GjItUfh08Z1pJvu8QZqb9s+mMvKV6WUQRV7K2R46YbjMXTTJw==}
     dependencies:
@@ -7762,6 +7865,11 @@ packages:
       streamsearch: 0.1.2
     dev: false
 
+  /diff-sequences/26.6.2:
+    resolution: {integrity: sha512-Mv/TDa3nZ9sbc5soK+OoA74BsS3mL37yixCvUAQkiuA4Wz6YtwP/K47n2rv2ovzHZvoiQeA5FTQOschKkEwB0Q==}
+    engines: {node: '>= 10.14.2'}
+    dev: true
+
   /diff-sequences/27.0.6:
     resolution: {integrity: sha512-ag6wfpBFyNXZ0p8pcuIDS//D8H062ZQJ3fzYxjpmeKjnz8W4pekL3AI8VohmyZmsWW2PWaHgjsmqR6L13101VQ==}
     engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
@@ -8264,6 +8372,23 @@ packages:
       - supports-color
     dev: true
 
+  /eslint-plugin-prettier/3.4.1_6e975bd57c7acf028c1a9ddbbf60c898:
+    resolution: {integrity: sha512-htg25EUYUeIhKHXjOinK4BgCcDwtLHjqaxCDsMy5nbnUMkKFvIhMVCp+5GFUXQ4Nr8lBsPqtGAqBenbpFqAA2g==}
+    engines: {node: '>=6.0.0'}
+    peerDependencies:
+      eslint: '>=5.0.0'
+      eslint-config-prettier: '*'
+      prettier: '>=1.13.0'
+    peerDependenciesMeta:
+      eslint-config-prettier:
+        optional: true
+    dependencies:
+      eslint: 7.32.0
+      eslint-config-prettier: 8.3.0_eslint@7.32.0
+      prettier: 2.4.1
+      prettier-linter-helpers: 1.0.0
+    dev: true
+
   /eslint-plugin-prettier/4.0.0_6e975bd57c7acf028c1a9ddbbf60c898:
     resolution: {integrity: sha512-98MqmCJ7vJodoQK359bqQWaxOE0CS8paAz/GgjaZLyex4TTk3g9HugoO89EqWCrFiOqn9EVvcoo7gZzONCWVwQ==}
     engines: {node: '>=6.0.0'}
@@ -8600,6 +8725,18 @@ packages:
       snapdragon: 0.8.2
       to-regex: 3.0.2
 
+  /expect/26.6.2:
+    resolution: {integrity: sha512-9/hlOBkQl2l/PLHJx6JjoDF6xPKcJEsUlWKb23rKE7KzeDqUZKXKNMW27KIue5JMdBV9HgmoJPcc8HtO85t9IA==}
+    engines: {node: '>= 10.14.2'}
+    dependencies:
+      '@jest/types': 26.6.2
+      ansi-styles: 4.3.0
+      jest-get-type: 26.3.0
+      jest-matcher-utils: 26.6.2
+      jest-message-util: 26.6.2
+      jest-regex-util: 26.0.0
+    dev: true
+
   /expect/27.2.0:
     resolution: {integrity: sha512-oOTbawMQv7AK1FZURbPTgGSzmhxkjFzoARSvDjOMnOpeWuYQx1tP6rXu9MIX5mrACmyCAM7fSNP8IJO2f1p0CQ==}
     engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
@@ -9064,6 +9201,10 @@ packages:
     engines: {node: '>= 0.6'}
     dev: false
 
+  /fp-ts/2.11.3:
+    resolution: {integrity: sha512-qHI5iaVSFNFmdl6yDensWfFMk32iafAINCnqx8m486DV1+Jht/bTnA9CyahL+Xm7h2y3erinviVBIAWvv5bPYw==}
+    dev: false
+
   /fragment-cache/0.2.1:
     resolution: {integrity: sha1-QpD60n8T6Jvn8zeZxrxaCr//DRk=}
     engines: {node: '>=0.10.0'}
@@ -10291,6 +10432,14 @@ packages:
     dependencies:
       loose-envify: 1.4.0
 
+  /io-ts/2.2.16_fp-ts@2.11.3:
+    resolution: {integrity: sha512-y5TTSa6VP6le0hhmIyN0dqEXkrZeJLeC5KApJq6VLci3UEKF80lZ+KuoUs02RhBxNWlrqSNxzfI7otLX1Euv8Q==}
+    peerDependencies:
+      fp-ts: ^2.5.0
+    dependencies:
+      fp-ts: 2.11.3
+    dev: true
+
   /ip/1.1.5:
     resolution: {integrity: sha1-vd7XARQpCCjAoDnnLvJfWq7ENUo=}
     dev: false
@@ -10879,6 +11028,16 @@ packages:
       - utf-8-validate
     dev: true
 
+  /jest-diff/26.6.2:
+    resolution: {integrity: sha512-6m+9Z3Gv9wN0WFVasqjCL/06+EFCMTqDEUl/b87HYK2rAPTyfz4ZIuSlPhY51PIQRWx5TaxeF1qmXKe9gfN3sA==}
+    engines: {node: '>= 10.14.2'}
+    dependencies:
+      chalk: 4.1.2
+      diff-sequences: 26.6.2
+      jest-get-type: 26.3.0
+      pretty-format: 26.6.2
+    dev: true
+
   /jest-diff/27.2.0:
     resolution: {integrity: sha512-QSO9WC6btFYWtRJ3Hac0sRrkspf7B01mGrrQEiCW6TobtViJ9RWL0EmOs/WnBsZDsI/Y2IoSHZA2x6offu0sYw==}
     engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
@@ -10937,6 +11096,11 @@ packages:
       jest-util: 27.2.0
     dev: true
 
+  /jest-get-type/26.3.0:
+    resolution: {integrity: sha512-TpfaviN1R2pQWkIihlfEanwOXK0zcxrKEE4MlU6Tn7keoXdN6/3gK/xl0yEh8DOunn5pOVGKf8hB4R9gVh04ig==}
+    engines: {node: '>= 10.14.2'}
+    dev: true
+
   /jest-get-type/27.0.6:
     resolution: {integrity: sha512-XTkK5exIeUbbveehcSR8w0bhH+c0yloW/Wpl+9vZrjzztCPWrxhHwkIFpZzCt71oRBsgxmuUfxEqOYoZI2macg==}
     engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
@@ -10996,6 +11160,16 @@ packages:
       pretty-format: 27.2.0
     dev: true
 
+  /jest-matcher-utils/26.6.2:
+    resolution: {integrity: sha512-llnc8vQgYcNqDrqRDXWwMr9i7rS5XFiCwvh6DTP7Jqa2mqpcCBBlpCbn+trkG0KNhPu/h8rzyBkriOtBstvWhw==}
+    engines: {node: '>= 10.14.2'}
+    dependencies:
+      chalk: 4.1.2
+      jest-diff: 26.6.2
+      jest-get-type: 26.3.0
+      pretty-format: 26.6.2
+    dev: true
+
   /jest-matcher-utils/27.2.0:
     resolution: {integrity: sha512-F+LG3iTwJ0gPjxBX6HCyrARFXq6jjiqhwBQeskkJQgSLeF1j6ui1RTV08SR7O51XTUhtc8zqpDj8iCG4RGmdKw==}
     engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
@@ -11006,6 +11180,21 @@ packages:
       pretty-format: 27.2.0
     dev: true
 
+  /jest-message-util/26.6.2:
+    resolution: {integrity: sha512-rGiLePzQ3AzwUshu2+Rn+UMFk0pHN58sOG+IaJbk5Jxuqo3NYO1U2/MIR4S1sKgsoYSXSzdtSa0TgrmtUwEbmA==}
+    engines: {node: '>= 10.14.2'}
+    dependencies:
+      '@babel/code-frame': 7.14.5
+      '@jest/types': 26.6.2
+      '@types/stack-utils': 2.0.1
+      chalk: 4.1.2
+      graceful-fs: 4.2.8
+      micromatch: 4.0.4
+      pretty-format: 26.6.2
+      slash: 3.0.0
+      stack-utils: 2.0.5
+    dev: true
+
   /jest-message-util/27.2.0:
     resolution: {integrity: sha512-y+sfT/94CiP8rKXgwCOzO1mUazIEdEhrLjuiu+RKmCP+8O/TJTSne9dqQRbFIHBtlR2+q7cddJlWGir8UATu5w==}
     engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
@@ -11041,6 +11230,11 @@ packages:
       jest-resolve: 27.2.0
     dev: true
 
+  /jest-regex-util/26.0.0:
+    resolution: {integrity: sha512-Gv3ZIs/nA48/Zvjrl34bf+oD76JHiGDUxNOVgUjh3j890sblXryjY4rss71fPtD/njchl6PSE2hIhvyWa1eT0A==}
+    engines: {node: '>= 10.14.2'}
+    dev: true
+
   /jest-regex-util/27.0.6:
     resolution: {integrity: sha512-SUhPzBsGa1IKm8hx2F4NfTGGp+r7BXJ4CulsZ1k2kI+mGLG+lxGrs76veN2LF/aUdGosJBzKgXmNCw+BzFqBDQ==}
     engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
@@ -14071,6 +14265,16 @@ packages:
       renderkid: 2.0.7
     dev: false
 
+  /pretty-format/26.6.2:
+    resolution: {integrity: sha512-7AeGuCYNGmycyQbCqd/3PWH4eOoX/OiCa0uphp57NVTeAGdJGaAliecxwBDHYQCIvrW7aDBZCYeNTP/WX69mkg==}
+    engines: {node: '>= 10'}
+    dependencies:
+      '@jest/types': 26.6.2
+      ansi-regex: 5.0.1
+      ansi-styles: 4.3.0
+      react-is: 17.0.2
+    dev: true
+
   /pretty-format/27.2.0:
     resolution: {integrity: sha512-KyJdmgBkMscLqo8A7K77omgLx5PWPiXJswtTtFV7XgVZv2+qPk6UivpXXO+5k6ZEbWIbLoKdx1pZ6ldINzbwTA==}
     engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
@@ -14429,6 +14633,10 @@ packages:
     engines: {node: '>=10'}
     dev: true
 
+  /quickjs-emscripten/0.13.0:
+    resolution: {integrity: sha512-+8oz1u1Xs1I/FlQuH7p0xb9/GTPNvcLDTbfSmIgUoe4wtFrDtgxlHekmEaToXZyFJ3/rJYzjuG4djjfXTn+3lA==}
+    dev: false
+
   /randombytes/2.1.0:
     resolution: {integrity: sha512-vYl3iOX+4CKUWuxGi9Ukhie6fsqXqS9FE2Zaic4tNFD2N2QQaXOMFbuKK4QmDHC0JO6B1Zp41J0LpT0oR68amQ==}
     dependencies:
@@ -16455,6 +16663,37 @@ packages:
       yargs-parser: 20.2.9
     dev: true
 
+  /ts-jest/27.0.5_bd302350a23170fc0ef61cbda3ff9f29:
+    resolution: {integrity: sha512-lIJApzfTaSSbtlksfFNHkWOzLJuuSm4faFAfo5kvzOiRAuoN4/eKxVJ2zEAho8aecE04qX6K1pAzfH5QHL1/8w==}
+    engines: {node: ^10.13.0 || ^12.13.0 || ^14.15.0 || >=15.0.0}
+    hasBin: true
+    peerDependencies:
+      '@babel/core': '>=7.0.0-beta.0 <8'
+      '@types/jest': ^27.0.0
+      babel-jest: '>=27.0.0 <28'
+      jest: ^27.0.0
+      typescript: '>=3.8 <5.0'
+    peerDependenciesMeta:
+      '@babel/core':
+        optional: true
+      '@types/jest':
+        optional: true
+      babel-jest:
+        optional: true
+    dependencies:
+      '@types/jest': 26.0.24
+      bs-logger: 0.2.6
+      fast-json-stable-stringify: 2.1.0
+      jest: 27.2.0
+      jest-util: 27.2.0
+      json5: 2.2.0
+      lodash: 4.17.21
+      make-error: 1.3.6
+      semver: 7.3.5
+      typescript: 4.4.3
+      yargs-parser: 20.2.9
+    dev: true
+
   /ts-loader/8.3.0_typescript@4.2.4:
     resolution: {integrity: sha512-MgGly4I6cStsJy27ViE32UoqxPTN9Xly4anxxVyaIWR+9BGxboV4EyJBGfR3RePV7Ksjj3rHmPZJeIt+7o4Vag==}
     engines: {node: '>=10.0.0'}