feat(module): devtools integration (#2196)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

devtools/app/plugins/prettier.client.ts

@@ -0,0 +1,54 @@
+import type { Options } from 'prettier'
+import PrettierWorker from '@/workers/prettier.js?worker&inline'
+
+export interface SimplePrettier {
+  format: (source: string, options?: Options) => Promise<string>
+}
+
+function createPrettierWorkerApi(worker: Worker): SimplePrettier {
+  let counter = 0
+  const handlers: any = {}
+
+  worker.addEventListener('message', (event) => {
+    const { uid, message, error } = event.data
+
+    if (!handlers[uid]) {
+      return
+    }
+
+    const [resolve, reject] = handlers[uid]
+    // eslint-disable-next-line @typescript-eslint/no-dynamic-delete
+    delete handlers[uid]
+
+    if (error) {
+      reject(error)
+    } else {
+      resolve(message)
+    }
+  })
+
+  function postMessage<T>(message: any) {
+    const uid = ++counter
+    return new Promise<T>((resolve, reject) => {
+      handlers[uid] = [resolve, reject]
+      worker.postMessage({ uid, message })
+    })
+  }
+
+  return {
+    format(source: string, options?: Options) {
+      return postMessage({ type: 'format', source, options })
+    }
+  }
+}
+
+export default defineNuxtPlugin(async () => {
+  const worker = new PrettierWorker()
+  const prettier = createPrettierWorkerApi(worker)
+
+  return {
+    provide: {
+      prettier
+    }
+  }
+})