Fix encoding in postcss-parser build (#8534)

Co-authored-by: Georgii Dolzhykov <thorn.mailbox@gmail.com>
Co-authored-by: fisker <lionkay@gmail.com>

scripts/build/build.js

@@ -4,6 +4,7 @@ const chalk = require("chalk");
 const execa = require("execa");
 const minimist = require("minimist");
 const path = require("path");
+const fs = require("fs");
 const stringWidth = require("string-width");
 
 const bundler = require("./bundler");
@@ -36,21 +37,33 @@ function fitTerminal(input) {
 }
 
 async function createBundle(bundleConfig, cache) {
-  const { output } = bundleConfig;
+  const { output, target } = bundleConfig;
   process.stdout.write(fitTerminal(output));
 
-  return bundler(bundleConfig, cache)
-    .catch((error) => {
-      console.log(FAIL + "\n");
-      handleError(error);
-    })
-    .then((result) => {
-      if (result.cached) {
-        console.log(CACHED);
-      } else {
-        console.log(OK);
+  try {
+    const { cached } = await bundler(bundleConfig, cache);
+
+    if (cached) {
+      console.log(CACHED);
+      return;
+    }
+
+    // Files including U+FFEE can't load in Chrome Extension
+    // `prettier-chrome-extension` https://github.com/prettier/prettier-chrome-extension
+    // details https://github.com/prettier/prettier/pull/8534
+    if (target === "universal") {
+      const file = path.join("dist", output);
+      const content = fs.readFileSync(file, "utf8");
+      if (content.includes("\ufffe")) {
+        throw new Error("Bundled umd file should not have U+FFFE character.");
       }
-    });
+    }
+
+    console.log(OK);
+  } catch (error) {
+    console.log(FAIL + "\n");
+    handleError(error);
+  }
 }
 
 function handleError(error) {

scripts/build/config.js

@@ -47,6 +47,10 @@ const parsers = [
       // prevent terser generate extra .LICENSE file
       extractComments: false,
       terserOptions: {
+        // prevent U+FFFE in the output
+        output: {
+          ascii_only: true,
+        },
         mangle: {
           // postcss need keep_fnames when minify
           keep_fnames: true,