fix: do not salt the hash of a chunk no minimizer would be handed

The salt makes a chunk's name vary with what its minimizer is and what it is run with, which is only true of a chunk one of them rewrites. Where `test` names something else, or every minimizer's own filter declines the name, the chunk is left alone and salting it renamed a file nothing here had touched.

The name is read off the template while the hash inside it is still being computed, so every hash placeholder stands for one character: what is asked of the name is its path and extension, which no hash carries. A template a function names is unknowable, and salts as before.

Author: alexander-akait

src/index.js

@@ -256,6 +256,34 @@ const declaredStage = (compiler, implementation) => {
   return latest;
 };
 
+/**
+ * The name a chunk's JavaScript asset will take, as far as it is knowable
+ * while the hash that name contains is still being computed.
+ * @param {Compilation} compilation compilation
+ * @param {import("webpack").Chunk} chunk chunk
+ * @returns {string | undefined} the name, or undefined where a function names it
+ */
+const chunkAssetName = (compilation, chunk) => {
+  const { outputOptions } = compilation;
+  const template =
+    chunk.filenameTemplate ||
+    (chunk.canBeInitial()
+      ? outputOptions.filename
+      : outputOptions.chunkFilename);
+
+  if (typeof template !== "string") {
+    return undefined;
+  }
+
+  // Every hash stands for one character it has not got yet: what is being
+  // asked of the name is its path and extension, which no hash carries.
+  return template
+    .replace(/\[(?:full|chunk|content)hash(?::\d+)?]/gi, "0")
+    .replace(/\[name]/gi, String(chunk.name || chunk.id || ""))
+    .replace(/\[id]/gi, String(chunk.id || ""))
+    .replace(/\[runtime]/gi, String(chunk.runtime || ""));
+};
+
 /**
  * The names an implementation's work goes under in an asset's info, which is
  * the union where several ran as one chain.
@@ -562,6 +590,31 @@ class MinimizerPlugin {
     return !(exclude && (matchPart(name, exclude) || matchPart(bare, exclude)));
   }
 
+  /**
+   * Whether any configured minimizer would be handed an asset of this name,
+   * by the plugin's own `test`/`include`/`exclude` and then by its own filter.
+   * @private
+   * @param {Compiler} compiler compiler
+   * @param {string} name asset name
+   * @returns {boolean} true when one of them would take it
+   */
+  minifiesName(compiler, name) {
+    if (!this.matchesName(compiler, name)) {
+      return false;
+    }
+
+    const { filters } = this.options.minimizer;
+
+    return this.minimizers().some((implementation, i) => {
+      const decides =
+        filters && typeof filters[i] === "function"
+          ? filters[i]
+          : implementation.filter;
+
+      return typeof decides !== "function" || decides(name, {}) !== false;
+    });
+  }
+
   /**
    * @private
    * @param {Compiler} compiler compiler
@@ -2283,9 +2336,20 @@ class MinimizerPlugin {
         options: this.options.minimizer.options,
       });
 
-      // The salt is the name this plugin shipped under, and every `[contenthash]`
-      // is taken over it: renaming it would rename every file a user serves.
       hooks.chunkHash.tap(pluginName, (chunk, hash) => {
+        const willBe = chunkAssetName(compilation, chunk);
+
+        // A chunk no minimizer here would be handed cannot vary with them, so
+        // salting it would rename a file this instance never rewrites.
+        if (
+          typeof willBe === "string" &&
+          !this.minifiesName(compiler, willBe)
+        ) {
+          return;
+        }
+
+        // The salt is the name this plugin shipped under, and every
+        // `[fullhash]` is taken over it: renaming it would rename every file.
         hash.update("TerserPlugin");
         hash.update(data);
       });

test/__snapshots__/test-option.test.js.snap

@@ -715,7 +715,7 @@ __webpack_require__.r(__webpack_exports__);
 /***/ }
 
 }]);",
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   "importExport.js?var=__hash0__": "/******/ (() => { // webpackBootstrap
 /******/ 	"use strict";
 
@@ -766,7 +766,7 @@ __webpack_require__.r(__webpack_exports__);
 /***/ }
 
 }]);",
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   "importExport.js?var=__hash0__": "/******/ (() => { // webpackBootstrap
 /******/ 	"use strict";
 

test/generate-option.test.js

@@ -1970,6 +1970,86 @@ describe("generate beside the minifier", () => {
     expect(getErrors(stats)).toEqual([]);
   });
 
+  it("should not rename a bundle no minimizer of its own would touch", async () => {
+    /**
+     * @param {boolean} withPlugin whether to apply the plugin
+     * @returns {Promise<string[]>} the emitted JavaScript names
+     */
+    const namesFrom = async (withPlugin) => {
+      const compiler = getCompiler({
+        entry: path.resolve(__dirname, "./fixtures/images.js"),
+        output: {
+          path: path.resolve(__dirname, "./dist"),
+          filename: "[name].[fullhash].js",
+        },
+        module: { rules: IMAGE_RULES },
+      });
+
+      if (withPlugin) {
+        new MinimizerPlugin({
+          test: /\.png$/i,
+          generate: {
+            implementation: (input) => ({
+              code: Buffer.from(Object.values(input)[0]),
+            }),
+            type: "asset",
+            filename: "[path][name].copy[ext]",
+          },
+        }).apply(compiler);
+      }
+
+      const stats = await compile(compiler);
+
+      return Object.keys(stats.compilation.assets)
+        .filter((name) => name.endsWith(".js"))
+        .sort();
+    };
+
+    // `test` names images, so no minimizer here is ever handed the bundle:
+    // salting its hash would rename a file this instance never rewrites.
+    expect(await namesFrom(true)).toEqual(await namesFrom(false));
+  });
+
+  it("should still rename when a minimizer would be handed the bundle", async () => {
+    /**
+     * @param {EXPECTED_ANY} minimizerOptions what to run terser with
+     * @returns {Promise<string[]>} the emitted JavaScript names
+     */
+    const namesFrom = async (minimizerOptions) => {
+      const compiler = getCompiler({
+        entry: path.resolve(__dirname, "./fixtures/images.js"),
+        output: {
+          path: path.resolve(__dirname, "./dist"),
+          filename: "[name].[fullhash].js",
+        },
+        module: { rules: IMAGE_RULES },
+      });
+
+      new MinimizerPlugin({
+        minimizerOptions,
+        generate: {
+          implementation: (input) => ({
+            code: Buffer.from(Object.values(input)[0]),
+          }),
+          type: "asset",
+          filename: "[path][name].copy[ext]",
+        },
+      }).apply(compiler);
+
+      const stats = await compile(compiler);
+
+      return Object.keys(stats.compilation.assets)
+        .filter((name) => name.endsWith(".js"))
+        .sort();
+    };
+
+    // The guard above must not cost the salt its job: what terser is run with
+    // still varies the name of what it rewrote.
+    expect(await namesFrom({ mangle: true })).not.toEqual(
+      await namesFrom({ mangle: false }),
+    );
+  });
+
   it("should still minify when only a generator was configured", async () => {
     const compiler = getCompiler({
       entry: path.resolve(__dirname, "./fixtures/images.js"),

types/index.d.ts

@@ -62,6 +62,15 @@ declare class MinimizerPlugin<T = import("terser").MinifyOptions> {
    * @returns {boolean} true when it is to be minified
    */
   private matchesName;
+  /**
+   * Whether any configured minimizer would be handed an asset of this name,
+   * by the plugin's own `test`/`include`/`exclude` and then by its own filter.
+   * @private
+   * @param {Compiler} compiler compiler
+   * @param {string} name asset name
+   * @returns {boolean} true when one of them would take it
+   */
+  private minifiesName;
   /**
    * @private
    * @param {Compiler} compiler compiler