refactor: bring js-sandbox project to the monorepo

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)
+    }
+  )
+)