diff --git a/src/lang/wasm.ts b/src/lang/wasm.ts
index 32653b2b0..3555daac2 100644
--- a/src/lang/wasm.ts
+++ b/src/lang/wasm.ts
@@ -25,6 +25,7 @@ import { AppInfo } from 'wasm-lib/kcl/bindings/AppInfo'
 import { CoreDumpManager } from 'lib/coredump'
 import openWindow from 'lib/openWindow'
 import { DefaultPlanes } from 'wasm-lib/kcl/bindings/DefaultPlanes'
+import { rangeTypeFix } from 'lang/workers/types'
 
 export type { Program } from '../wasm-lib/kcl/bindings/Program'
 export type { Value } from '../wasm-lib/kcl/bindings/Value'
@@ -103,9 +104,6 @@ const initialise = async () => {
 
 export const initPromise = initialise()
 
-export const rangeTypeFix = (ranges: number[][]): [number, number][] =>
-  ranges.map(([start, end]) => [start, end])
-
 export const parse = (code: string): Program => {
   try {
     const program: Program = parse_wasm(code)
diff --git a/src/lang/workers/parser.ts b/src/lang/workers/parser.ts
index e5e139bb0..e8370d6fc 100644
--- a/src/lang/workers/parser.ts
+++ b/src/lang/workers/parser.ts
@@ -1,11 +1,14 @@
-import { fileSystemManager } from 'lang/std/fileSystemManager'
-import init, {parse_wasm
-} from 'wasm-lib/pkg/wasm_lib'
-import * as jsrpc from 'json-rpc-2.0'
+import init, { parse_wasm } from 'wasm-lib/pkg/wasm_lib'
 import { Program } from 'lang/wasm'
 import { KclError as RustKclError } from 'wasm-lib/kcl/bindings/KclError'
 import { KCLError } from 'lang/errors'
-import { WasmWorkerEventType, WasmWorkerEvent, WasmWorkerOptions } from './types'
+import {
+  WasmWorkerEventType,
+  WasmWorkerEvent,
+  WasmWorkerOptions,
+  ParserWorkerCall,
+  rangeTypeFix,
+} from 'lang/workers/types'
 
 // Initialise the wasm module.
 const initialise = async (wasmUrl: string) => {
@@ -14,25 +17,6 @@ const initialise = async (wasmUrl: string) => {
   return init(buffer)
 }
 
-export const rangeTypeFix = (ranges: number[][]): [number, number][] =>
-  ranges.map(([start, end]) => [start, end])
-
-export const parse = (code: string): Program => {
-  try {
-    const program: Program = parse_wasm(code)
-    return program
-  } catch (e: any) {
-    const parsed: RustKclError = JSON.parse(e.toString())
-    const kclError = new KCLError(
-      parsed.kind,
-      parsed.msg,
-      rangeTypeFix(parsed.sourceRanges)
-    )
-
-    console.log(kclError)
-    throw kclError
-  }
-}
 onmessage = function (event) {
   const { worker, eventType, eventData }: WasmWorkerEvent = event.data
 
@@ -48,19 +32,22 @@ onmessage = function (event) {
         })
       break
     case WasmWorkerEventType.Call:
-      const data = eventData as Uint8Array
-      intoServer.enqueue(data)
-      const json: jsrpc.JSONRPCRequest = Codec.decode(data)
-      if (null != json.id) {
-        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-        fromServer.responses.get(json.id)!.then((response) => {
-          const encoded = Codec.encode(response as jsrpc.JSONRPCResponse)
-          postMessage(encoded)
-        })
+      const data = eventData as ParserWorkerCall
+      try {
+        const program: Program = parse_wasm(data.code)
+        postMessage(program)
+      } catch (e: any) {
+        const parsed: RustKclError = JSON.parse(e.toString())
+        const kclError = new KCLError(
+          parsed.kind,
+          parsed.msg,
+          rangeTypeFix(parsed.sourceRanges)
+        )
+
+        postMessage(kclError)
       }
       break
     default:
       console.error('Worker: Unknown message type', worker, eventType)
   }
 }
-
diff --git a/src/lang/workers/types.ts b/src/lang/workers/types.ts
index 374edd7f6..46a21b5c3 100644
--- a/src/lang/workers/types.ts
+++ b/src/lang/workers/types.ts
@@ -1,7 +1,8 @@
-
+import { KCLError } from 'lang/errors'
+import { Program } from 'lang/wasm'
 
 export enum WasmWorker {
-    Parser = 'parser',
+  Parser = 'parser',
 }
 export enum WasmWorkerEventType {
   Init = 'init',
@@ -13,10 +14,10 @@ export interface WasmWorkerOptions {
 }
 
 export interface ParserWorkerCall {
-    code: string
+  code: string
 }
 
-
+export type ParserWorkerResponse = Program | KCLError
 
 export interface WasmWorkerEvent {
   eventType: WasmWorkerEventType
@@ -24,4 +25,5 @@ export interface WasmWorkerEvent {
   worker: WasmWorker
 }
 
-
+export const rangeTypeFix = (ranges: number[][]): [number, number][] =>
+  ranges.map(([start, end]) => [start, end])