Bundle third-party.js in ESM (#13509)

scripts/build/bundler.mjs

@@ -218,7 +218,7 @@ function* getEsbuildOptions(bundle, buildOptions) {
     esbuildOptions.platform = "node";
     esbuildOptions.external.push(...bundledFiles.map(({ output }) => output));
 
-    if (interopDefault) {
+    if (bundle.format !== "esm" && interopDefault) {
       esbuildOptions.plugins.push(esbuildPluginInteropDefault());
     }
 

scripts/build/config.mjs

@@ -279,11 +279,12 @@ const coreBundles = [
     output: "cli.mjs",
     format: "esm",
     external: ["benchmark"],
-    interopDefault: false,
     replaceModule: [replaceDiffPackageEntry("lib/patch/create.js")],
   },
   {
     input: "src/common/third-party.js",
+    output: "third-party.mjs",
+    format: "esm",
     replaceModule: [
       // cosmiconfig@6 -> import-fresh can't find parentModule, since module is bundled
       {

tests/integration/env.js

@@ -12,7 +12,7 @@ const prettierCli = path.join(
 );
 
 const thirdParty = isProduction
-  ? path.join(PRETTIER_DIR, "./third-party.js")
+  ? path.join(PRETTIER_DIR, "./third-party.mjs")
   : path.join(PRETTIER_DIR, "./src/common/third-party.js");
 
 const projectRoot = path.join(__dirname, "../..");