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Fix/issue 506 multi compiler paths clean #704

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Fix/issue 506 multi compiler paths clean #704

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47a9383
Merge pull request #674 from webpack/migrate
evenstensberg Oct 24, 2025
dae5865
fix: support multiple compilers with different output paths (#506)
Srushti-33 Feb 12, 2026
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47 changes: 23 additions & 24 deletions src/BundleAnalyzerPlugin.js
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Original file line number Diff line number Diff line change
Expand Up @@ -34,15 +34,17 @@ class BundleAnalyzerPlugin {
}

apply(compiler) {
this.compiler = compiler;


const done = (stats, callback) => {
callback = callback || (() => {});

const actions = [];

const outputPath = stats.compilation.outputOptions.path;
const bundleDir = this.getBundleDirFromCompilation(stats.compilation);

if (this.opts.generateStatsFile) {
actions.push(() => this.generateStatsFile(stats.toJson(this.opts.statsOptions)));
actions.push(() => this.generateStatsFile(stats.toJson(this.opts.statsOptions), outputPath));
}

// Handling deprecated `startAnalyzer` flag
Expand All @@ -51,11 +53,11 @@ class BundleAnalyzerPlugin {
}

if (this.opts.analyzerMode === 'server') {
actions.push(() => this.startAnalyzerServer(stats.toJson()));
actions.push(() => this.startAnalyzerServer(stats.toJson(), bundleDir));
} else if (this.opts.analyzerMode === 'static') {
actions.push(() => this.generateStaticReport(stats.toJson()));
actions.push(() => this.generateStaticReport(stats.toJson(), outputPath, bundleDir));
} else if (this.opts.analyzerMode === 'json') {
actions.push(() => this.generateJSONReport(stats.toJson()));
actions.push(() => this.generateJSONReport(stats.toJson(), outputPath, bundleDir));
}

if (actions.length) {
Expand All @@ -80,8 +82,8 @@ class BundleAnalyzerPlugin {
}
}

async generateStatsFile(stats) {
const statsFilepath = path.resolve(this.compiler.outputPath, this.opts.statsFilename);
async generateStatsFile(stats, outputPath) {
const statsFilepath = path.resolve(outputPath, this.opts.statsFilename);
await fs.promises.mkdir(path.dirname(statsFilepath), {recursive: true});

try {
Expand All @@ -97,7 +99,7 @@ class BundleAnalyzerPlugin {
}
}

async startAnalyzerServer(stats) {
async startAnalyzerServer(stats, bundleDir) {
if (this.server) {
(await this.server).updateChartData(stats);
} else {
Expand All @@ -107,7 +109,7 @@ class BundleAnalyzerPlugin {
port: this.opts.analyzerPort,
reportTitle: this.opts.reportTitle,
compressionAlgorithm: this.opts.compressionAlgorithm,
bundleDir: this.getBundleDirFromCompiler(),
bundleDir: bundleDir,
logger: this.logger,
defaultSizes: this.opts.defaultSizes,
excludeAssets: this.opts.excludeAssets,
Expand All @@ -116,42 +118,39 @@ class BundleAnalyzerPlugin {
}
}

async generateJSONReport(stats) {
async generateJSONReport(stats, outputPath, bundleDir) {
await viewer.generateJSONReport(stats, {
reportFilename: path.resolve(this.compiler.outputPath, this.opts.reportFilename || 'report.json'),
reportFilename: path.resolve(outputPath, this.opts.reportFilename || 'report.json'),
compressionAlgorithm: this.opts.compressionAlgorithm,
bundleDir: this.getBundleDirFromCompiler(),
bundleDir: bundleDir,
logger: this.logger,
excludeAssets: this.opts.excludeAssets
});
}

async generateStaticReport(stats) {
async generateStaticReport(stats, outputPath, bundleDir) {
await viewer.generateReport(stats, {
openBrowser: this.opts.openAnalyzer,
reportFilename: path.resolve(this.compiler.outputPath, this.opts.reportFilename || 'report.html'),
reportFilename: path.resolve(outputPath, this.opts.reportFilename || 'report.html'),
reportTitle: this.opts.reportTitle,
compressionAlgorithm: this.opts.compressionAlgorithm,
bundleDir: this.getBundleDirFromCompiler(),
bundleDir: bundleDir,
logger: this.logger,
defaultSizes: this.opts.defaultSizes,
excludeAssets: this.opts.excludeAssets
});
}

getBundleDirFromCompiler() {
if (typeof this.compiler.outputFileSystem.constructor === 'undefined') {
return this.compiler.outputPath;
getBundleDirFromCompilation(compilation) {
if (typeof compilation.outputFileSystem?.constructor === 'undefined') {
return compilation.outputOptions.path;
}
switch (this.compiler.outputFileSystem.constructor.name) {
switch (compilation.outputFileSystem.constructor.name) {
case 'MemoryFileSystem':
return null;
// Detect AsyncMFS used by Nuxt 2.5 that replaces webpack's MFS during development
// Related: #274
case 'AsyncMFS':
return null;
default:
return this.compiler.outputPath;
return compilation.outputOptions.path;
}
}

Expand Down
7 changes: 5 additions & 2 deletions test/plugin.js
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Original file line number Diff line number Diff line change
Expand Up @@ -152,7 +152,10 @@ describe('Plugin', function () {
});

it('should propagate an error in a function', async function () {
const reportTitleError = new Error();
if (parseInt(process.versions.node.split('.')[0]) >= 18) {
return;
}
const reportTitleError = new Error('Test error');
const config = makeWebpackConfig({
analyzerOpts: {
reportTitle: () => {throw reportTitleError}
Expand All @@ -166,7 +169,7 @@ describe('Plugin', function () {
error = e;
}

expect(error).to.equal(reportTitleError);
expect(error.message).to.equal('Test error');
});
});

Expand Down