Use bson library to parse to json

packages/server/src/jsRunner/bundles/bsonPackage.ts

@@ -1 +1,4 @@
+import { EJSON } from "bson"
+
 export { deserialize } from "bson"
+export const toJson = EJSON.deserialize

packages/server/src/utilities/scriptRunner.ts

@@ -26,8 +26,8 @@ class ScriptRunner {
       // 1. Serialise the data from potential BSON to buffer before passing it to the isolate
       // 2. Deserialise the data within the isolate, to get the original data
       // 3. Process script
-      // 4. Stringify and parse result in order to convert the result from BSON to json
-      script = `return JSON.parse(JSON.stringify((function(){data=deserialize(data).data;${script}})()));`
+      // 4. Stringify the result in order to convert the result from BSON to json
+      script = `return toJson((function(){data=deserialize(data, { validation: { utf8: true } }).data;${script}})());`
     }
 
     this.vm.code = script
@@ -93,7 +93,7 @@ class IsolatedVM {
   set code(code: string) {
     code = `const fn=function(){${code}};results.out=fn();`
     if (this.#bsonModule) {
-      code = `import {deserialize} from "compiled_module";${code}`
+      code = `import {deserialize, toJson} from "compiled_module";${code}`
     }
     this.#script = this.#isolate.compileModuleSync(code)
   }