refactor: port postman and insomnia importers

packages/hoppscotch-app/helpers/import-export/import/insomnia.ts

@@ -0,0 +1,54 @@
+import * as TE from "fp-ts/TaskEither"
+import { HoppRESTRequest } from "@hoppscotch/data"
+import { step } from "../steps"
+import { parsePostmanCollection } from "./postman"
+import { defineImporter, IMPORTER_INVALID_FILE_FORMAT } from "."
+import { parseInsomniaCollection } from "~/helpers/utils/parseInsomniaCollection"
+import { Collection } from "~/newstore/collections"
+
+// This Importer definition is less than ideal,
+// would love an attempt at refactoring this
+
+export default defineImporter({
+  name: "Insomnia Collection",
+  steps: [
+    step({
+      stepName: "FILE_OR_URL_IMPORT",
+      metadata: {
+        acceptedFileTypes: ".json",
+      },
+    }),
+  ] as const,
+  importer: ([fileContent]) => {
+    try {
+      let collections = parseInsomniaCollection(fileContent)
+      const content = JSON.stringify(collections)
+
+      if (collections[0]) {
+        const [name, folders, requests] = Object.keys(collections[0])
+        if (
+          name === "name" &&
+          folders === "folders" &&
+          requests === "requests"
+        ) {
+          return TE.right(collections as Collection<HoppRESTRequest>[])
+        }
+
+        return TE.left(IMPORTER_INVALID_FILE_FORMAT)
+      } else if (
+        collections.info &&
+        collections.info.schema.includes("v2.1.0")
+      ) {
+        // replace the variables, postman uses {{var}}, Hoppscotch uses <<var>>
+        collections = JSON.parse(content.replaceAll(/{{([a-z]+)}}/gi, "<<$1>>"))
+        collections = [parsePostmanCollection(collections)]
+
+        return TE.right(collections as Collection<HoppRESTRequest>[])
+      } else {
+        return TE.left(IMPORTER_INVALID_FILE_FORMAT)
+      }
+    } catch (_e) {
+      return TE.left(IMPORTER_INVALID_FILE_FORMAT)
+    }
+  },
+})