Refactor to use make-synchronized (#18)

examples/format-file.js

@@ -0,0 +1,13 @@
+import * as fs from "node:fs/promises";
+import * as prettier from "prettier";
+import makeSynchronized from "make-synchronized";
+
+export default makeSynchronized(import.meta, async function formatFile(file) {
+  const config = await prettier.resolveConfig(file);
+  const content = await fs.readFile(file, "utf8");
+  const formatted = await prettier.format(content, {
+    ...config,
+    filepath: file,
+  });
+  await fs.writeFile(file, formatted);
+});

examples/run-format-file.js

@@ -0,0 +1,6 @@
+import * as url from "node:url";
+import formatFile from "./format-file.js";
+
+console.log(
+  formatFile(url.fileURLToPath(new URL("../readme.md", import.meta.url))),
+);

index.cjs

@@ -1,168 +1,10 @@
 "use strict";
 
-const {
-  Worker,
-  receiveMessageOnPort,
-  MessageChannel,
-} = require("worker_threads");
-const url = require("url");
-const path = require("path");
+const { makeModuleSynchronized } = require("make-synchronized");
 
-/**
-@template {keyof PrettierSynchronizedFunctions} FunctionName
-@typedef {(...args: Parameters<Prettier[FunctionName]>) => Awaited<ReturnType<Prettier[FunctionName]>> } PrettierSyncFunction
-*/
-
-/**
-@typedef {import("prettier")} Prettier
-@typedef {{ [FunctionName in typeof PRETTIER_ASYNC_FUNCTIONS[number]]: PrettierSyncFunction<FunctionName> }} PrettierSynchronizedFunctions
-@typedef {{ [PropertyName in typeof PRETTIER_STATIC_PROPERTIES[number]]: Prettier[PropertyName] }} PrettierStaticProperties
-@typedef {PrettierSynchronizedFunctions & PrettierStaticProperties} SynchronizedPrettier
-*/
-
-const PRETTIER_ASYNC_FUNCTIONS = /** @type {const} */ ([
-  "formatWithCursor",
-  "format",
-  "check",
-  "resolveConfig",
-  "resolveConfigFile",
-  "clearConfigCache",
-  "getFileInfo",
-  "getSupportInfo",
-]);
-
-const PRETTIER_STATIC_PROPERTIES = /** @type {const} */ ([
-  "version",
-  "util",
-  "doc",
-]);
-
-/** @type {Worker | undefined} */
-let worker;
-function createWorker() {
-  if (!worker) {
-    worker = new Worker(require.resolve("./worker.js"));
-    worker.unref();
-  }
-
-  return worker;
-}
-
-/**
- * @template {keyof PrettierSynchronizedFunctions} FunctionName
- * @param {FunctionName} functionName
- * @param {string} prettierEntry
- * @returns {PrettierSyncFunction<FunctionName>}
- */
-function createSynchronizedFunction(functionName, prettierEntry) {
-  return (...args) => {
-    const signal = new Int32Array(new SharedArrayBuffer(4));
-    const { port1: localPort, port2: workerPort } = new MessageChannel();
-    const worker = createWorker();
-
-    worker.postMessage(
-      { signal, port: workerPort, functionName, args, prettierEntry },
-      [workerPort],
-    );
-
-    Atomics.wait(signal, 0, 0);
-
-    const {
-      message: { result, error, errorData },
-    } = receiveMessageOnPort(localPort);
-
-    if (error) {
-      throw Object.assign(error, errorData);
-    }
-
-    return result;
-  };
-}
-
-/**
- * @template {keyof PrettierStaticProperties} Property
- * @param {Property} property
- * @param {string} prettierEntry
- */
-function getProperty(property, prettierEntry) {
-  return /** @type {Prettier} */ (require(prettierEntry))[property];
-}
-
-/**
- * @template {keyof SynchronizedPrettier} ExportName
- * @param {() => SynchronizedPrettier[ExportName]} getter
- */
-function createDescriptor(getter) {
-  let value;
-  return {
-    get: () => {
-      value ??= getter();
-      return value;
-    },
-    enumerable: true,
-  };
-}
-
-/**
- * @param {string | URL} entry
- */
-function toImportId(entry) {
-  if (entry instanceof URL) {
-    return entry.href;
-  }
-
-  if (typeof entry === "string" && path.isAbsolute(entry)) {
-    return url.pathToFileURL(entry).href;
-  }
-
-  return entry;
-}
-
-/**
- * @param {string | URL} entry
- */
-function toRequireId(entry) {
-  if (entry instanceof URL || entry.startsWith("file:")) {
-    return url.fileURLToPath(entry);
-  }
-
-  return entry;
-}
-
-/**
- * @param {object} options
- * @param {string | URL} options.prettierEntry - Path or URL to prettier entry.
- * @returns {SynchronizedPrettier}
- */
 function createSynchronizedPrettier({ prettierEntry }) {
-  const importId = toImportId(prettierEntry);
-  const requireId = toRequireId(prettierEntry);
-
-  const prettier = Object.defineProperties(
-    Object.create(null),
-    Object.fromEntries(
-      [
-        ...PRETTIER_ASYNC_FUNCTIONS.map((functionName) => {
-          return /** @type {const} */ ([
-            functionName,
-            () => createSynchronizedFunction(functionName, importId),
-          ]);
-        }),
-        ...PRETTIER_STATIC_PROPERTIES.map((property) => {
-          return /** @type {const} */ ([
-            property,
-            () => getProperty(property, requireId),
-          ]);
-        }),
-      ].map(([property, getter]) => {
-        return /** @type {const} */ ([property, createDescriptor(getter)]);
-      }),
-    ),
-  );
-
-  return prettier;
+  return makeModuleSynchronized(prettierEntry);
 }
 
 module.exports = createSynchronizedPrettier({ prettierEntry: "prettier" });
-// @ts-expect-error Property 'createSynchronizedPrettier' for named export compatibility
 module.exports.createSynchronizedPrettier = createSynchronizedPrettier;

package.json

@@ -44,17 +44,20 @@
     ]
   },
   "peerDependencies": {
-    "prettier": "^3.0.0"
+    "prettier": "*"
   },
   "devDependencies": {
-    "@types/node": "20.4.1",
-    "c8": "8.0.0",
+    "@types/node": "20.11.5",
+    "c8": "9.1.0",
     "npm-run-all": "4.1.5",
-    "prettier": "3.0.0"
+    "prettier": "3.2.4"
   },
   "packageManager": "[email protected]",
   "publishConfig": {
     "access": "public",
     "registry": "https://registry.npmjs.org/"
+  },
+  "dependencies": {
+    "make-synchronized": "^0.2.1"
   }
 }

readme.md

@@ -31,6 +31,26 @@ synchronizedPrettier.format("foo( )", { parser: "babel" });
 // => 'foo();\n'
 ```
 
+This package is a simple wrapper of [`make-synchronized`](https://github.com/fisker/make-synchronized), currently only the functions and primitive values exported from `prettier` is functional, functions not exported directly (eg: `prettier.__debug.parse`) doesn't work, but it can be supported, if you want more functionality, please [open an issue](https://github.com/prettier/prettier-synchronized/issues/new).
+
+For more complex use cases, it more reasonable to extract into a separate file, and run with [`make-synchronized`](https://github.com/fisker/make-synchronized), example
+
+```js
+import * as fs from "node:fs/promises";
+import * as prettier from "prettier";
+import makeSynchronized from "make-synchronized";
+
+export default makeSynchronized(import.meta, async function formatFile(file) {
+  const config = await prettier.resolveConfig(file);
+  const content = await fs.readFile(file, "utf8");
+  const formatted = await prettier.format(content, {
+    ...config,
+    filepath: file,
+  });
+  await fs.writeFile(file, formatted);
+});
+```
+
 ### `createSynchronizedPrettier(options)`
 
 #### `options`

test.js

@@ -31,7 +31,6 @@ test("version", () => {
   const fakePrettierRelatedPath = "./a-fake-prettier-to-test.cjs";
   const fakePrettierUrl = new URL(fakePrettierRelatedPath, import.meta.url);
   for (const prettierEntry of [
-    fakePrettierRelatedPath,
     fakePrettierUrl,
     fakePrettierUrl.href,
     fileURLToPath(fakePrettierUrl),

tsconfig.json

@@ -4,7 +4,7 @@
     "checkJs": true,
     "noEmit": true,
     "target": "esnext",
-    "module": "NodeNext"
+    "module": "NodeNext",
   },
-  "files": ["index.cjs"]
+  "files": ["index.cjs"],
 }