From 48a6e73d5bde02295e9b619ac2bd402d16b8a6c7 Mon Sep 17 00:00:00 2001
From: fisker Cheung <lionkay@gmail.com>
Date: Tue, 27 Jan 2026 08:47:50 +0800
Subject: [PATCH] Improve build script for oxc plugin (#18755)

---
 scripts/build/hacks/build-oxc-wasm-parser.js | 41 +++++++++-----------
 scripts/build/packages/plugin-oxc.js         |  7 +++-
 2 files changed, 23 insertions(+), 25 deletions(-)

diff --git a/scripts/build/hacks/build-oxc-wasm-parser.js b/scripts/build/hacks/build-oxc-wasm-parser.js
index fa1369cba..f6f12cbf0 100644
--- a/scripts/build/hacks/build-oxc-wasm-parser.js
+++ b/scripts/build/hacks/build-oxc-wasm-parser.js
@@ -5,7 +5,6 @@ import spawn from "nano-spawn";
 import { outdent } from "outdent";
 import packageJson from "../../../package.json" with { type: "json" };
 
-const CACHE_VERSION = "v1";
 const TEMPORARY_DIRECTORY = new URL("../../../.tmp/", import.meta.url);
 const DIRECTORY_NAME = "prettier-oxc-wasm-parser";
 const PACKAGE_NAME = "@oxc-parser/binding-wasm32-wasi";
@@ -40,16 +39,22 @@ async function install(version) {
   return directory;
 }
 
+const wasmUrlPattern =
+  /var __wasmUrl = new URL\("(?<wasmFile>.\/[a-z0-9.-]+\.wasm)", import\.meta\.url\)\.href;/;
 async function inlineWasmBinary(directory) {
   const packageDirectory = new URL(
     "./node_modules/@oxc-parser/binding-wasm32-wasi/",
     directory,
   );
   const entryFile = new URL("./browser-bundle.js", packageDirectory);
-  const wasmFile = new URL("./parser.wasm32-wasi.wasm", packageDirectory);
-
   let text = await fs.readFile(entryFile, "utf8");
-  const wasmBase64String = await fs.readFile(wasmFile, "base64");
+
+  const { wasmFile } = text.match(wasmUrlPattern).groups;
+
+  const wasmBase64String = await fs.readFile(
+    new URL(wasmFile, entryFile),
+    "base64",
+  );
 
   text = outdent`
     import { decode as __decode } from "base64-arraybuffer-es6";
@@ -60,17 +65,18 @@ async function inlineWasmBinary(directory) {
     ${text}
   `;
 
+  text = text.replace(wasmUrlPattern, "");
+  text = text.replace(
+    "await fetch(__wasmUrl).then((res) => res.arrayBuffer())",
+    `/* "${wasmFile}" */ __base64ToArrayBuffer(${JSON.stringify(wasmBase64String)})`,
+  );
+
   text = text.replaceAll(
     /new URL\((?<url>".*?"), import\.meta\.url\)/g,
     "{/* $<url> */}",
   );
 
-  text = text.replace(
-    "await fetch(__wasmUrl).then((res) => res.arrayBuffer())",
-    `__base64ToArrayBuffer(${JSON.stringify(wasmBase64String)})`,
-  );
-
-  await fs.writeFile(entryFile, text);
+  return { entry: url.fileURLToPath(entryFile), text, directory };
 }
 
 async function buildOxcWasmParser() {
@@ -79,26 +85,15 @@ async function buildOxcWasmParser() {
     `./${DIRECTORY_NAME}@${version}/`,
     TEMPORARY_DIRECTORY,
   );
-  const entry = new URL(`./index-${CACHE_VERSION}.mjs`, directory);
 
-  if (!existsSync(entry)) {
+  if (!existsSync(directory)) {
     await fs.rm(directory, { recursive: true, force: true });
 
     const installDirectory = await install(version);
     await fs.rename(installDirectory, directory);
-
-    await fs.writeFile(
-      entry,
-      `export {parseSync} from '${PACKAGE_NAME}/browser-bundle.js'`,
-    );
-
-    await inlineWasmBinary(directory);
   }
 
-  return {
-    entry: url.fileURLToPath(entry),
-    directory: url.fileURLToPath(directory),
-  };
+  return await inlineWasmBinary(directory);
 }
 
 export default buildOxcWasmParser;
diff --git a/scripts/build/packages/plugin-oxc.js b/scripts/build/packages/plugin-oxc.js
index b5ffb5301..dafed5a67 100644
--- a/scripts/build/packages/plugin-oxc.js
+++ b/scripts/build/packages/plugin-oxc.js
@@ -21,7 +21,6 @@ const mainModule = {
     {
       input: "index.js",
       output: "index.mjs",
-      prepare: buildOxcWasmParser,
       build: createJavascriptModuleBuilder({
         input: "index.js",
         output: "index.mjs",
@@ -35,7 +34,7 @@ const mainModule = {
       input: "index.js",
       output: "index.browser.mjs",
       build: createJavascriptModuleBuilder(async () => {
-        const { entry } = await buildOxcWasmParser();
+        const { entry, text } = await buildOxcWasmParser();
         return {
           format: "esm",
           platform: "universal",
@@ -45,6 +44,10 @@ const mainModule = {
               module: getPackageFile("oxc-parser/src-js/wasm.js"),
               path: entry,
             },
+            {
+              module: entry,
+              text,
+            },
           ],
           allowedWarnings: ["indirect-require", "package.json"],
         };