Fix diff package import (#12462)

Co-authored-by: Sosuke Suzuki <aosukeke@gmail.com>

scripts/build/config.mjs

@@ -23,6 +23,20 @@ const { require } = createEsmUtils(import.meta);
  * @property {string[]} ignore - paths of CJS modules to ignore
  */
 
+/*
+`diff` use deprecated folder mapping "./" in the "exports" field,
+so we can't `require("diff/lib/diff/array.js")` directory.
+To reduce the bundle size
+
+We can switch to deep require once https://github.com/kpdecker/jsdiff/pull/351 get merged
+*/
+const replaceDiffPackageEntry = (file) => ({
+  [require.resolve("diff")]: path.join(
+    path.dirname(require.resolve("diff/package.json")),
+    file
+  ),
+});
+
 /** @type {Bundle[]} */
 const parsers = [
   {
@@ -229,6 +243,7 @@ const coreBundles = [
         replacement: "const utilInspect = require('util').inspect",
       },
     ],
+    replaceModule: replaceDiffPackageEntry("lib/diff/array.js"),
   },
   {
     input: "src/document/index.js",
@@ -248,6 +263,7 @@ const coreBundles = [
       ),
       [createRequire(require.resolve("vnopts")).resolve("chalk")]:
         require.resolve("./shims/chalk.cjs"),
+      ...replaceDiffPackageEntry("lib/diff/array.js"),
     },
   },
   {
@@ -260,6 +276,7 @@ const coreBundles = [
     input: "src/cli/index.js",
     output: "cli.js",
     external: ["benchmark"],
+    replaceModule: replaceDiffPackageEntry("lib/patch/create.js"),
   },
   {
     input: "src/common/third-party.js",

src/cli/format.js

@@ -17,18 +17,9 @@ const getOptionsForFile = require("./options/get-options-for-file.js");
 const isTTY = require("./is-tty.js");
 
 function diff(a, b) {
-  // Use `diff/lib/patch/create.js` instead of `diff` to reduce bundle size
-  return require("diff/lib/patch/create.js").createTwoFilesPatch(
-    "",
-    "",
-    a,
-    b,
-    "",
-    "",
-    {
-      context: 2,
-    }
-  );
+  return require("diff").createTwoFilesPatch("", "", a, b, "", "", {
+    context: 2,
+  });
 }
 
 function handleError(context, filename, error, printedFilename) {

src/main/core.js

@@ -1,7 +1,6 @@
 "use strict";
 
-// Use `diff/lib/diff/array.js` instead of `diff` to reduce bundle size
-const { diffArrays } = require("diff/lib/diff/array.js");
+const { diffArrays } = require("diff");
 
 const {
   printer: { printDocToString },