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index.js
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index.js
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import crypto from 'crypto';
import path from 'path';
import { SourceMapConsumer } from 'source-map';
import { SourceMapSource, RawSource, ConcatSource } from 'webpack-sources';
import RequestShortener from 'webpack/lib/RequestShortener';
import {
ModuleFilenameHelpers,
SourceMapDevToolPlugin,
javascript,
version as webpackVersion,
} from 'webpack';
import validateOptions from 'schema-utils';
import serialize from 'serialize-javascript';
import terserPackageJson from 'terser/package.json';
import schema from './options.json';
import TaskRunner from './TaskRunner';
const warningRegex = /\[.+:([0-9]+),([0-9]+)\]/;
class TerserPlugin {
constructor(options = {}) {
validateOptions(schema, options, {
name: 'Terser Plugin',
baseDataPath: 'options',
});
const {
minify,
terserOptions = {},
test = /\.m?js(\?.*)?$/i,
chunkFilter = () => true,
warningsFilter = () => true,
extractComments = true,
sourceMap,
cache = true,
cacheKeys = (defaultCacheKeys) => defaultCacheKeys,
parallel = true,
include,
exclude,
} = options;
this.options = {
test,
chunkFilter,
warningsFilter,
extractComments,
sourceMap,
cache,
cacheKeys,
parallel,
include,
exclude,
minify,
terserOptions,
};
}
static isSourceMap(input) {
// All required options for `new SourceMapConsumer(...options)`
// https://github.com/mozilla/source-map#new-sourcemapconsumerrawsourcemap
return Boolean(
input &&
input.version &&
input.sources &&
Array.isArray(input.sources) &&
typeof input.mappings === 'string'
);
}
static buildSourceMap(inputSourceMap) {
if (!inputSourceMap || !TerserPlugin.isSourceMap(inputSourceMap)) {
return null;
}
return new SourceMapConsumer(inputSourceMap);
}
static buildError(error, file, sourceMap, requestShortener) {
// Handling error which should have line, col, filename and message
if (error.line) {
const original =
sourceMap &&
sourceMap.originalPositionFor({
line: error.line,
column: error.col,
});
if (original && original.source && requestShortener) {
return new Error(
`${file} from Terser\n${error.message} [${requestShortener.shorten(
original.source
)}:${original.line},${original.column}][${file}:${error.line},${
error.col
}]${
error.stack
? `\n${error.stack
.split('\n')
.slice(1)
.join('\n')}`
: ''
}`
);
}
return new Error(
`${file} from Terser\n${error.message} [${file}:${error.line},${
error.col
}]${
error.stack
? `\n${error.stack
.split('\n')
.slice(1)
.join('\n')}`
: ''
}`
);
}
if (error.stack) {
return new Error(`${file} from Terser\n${error.stack}`);
}
return new Error(`${file} from Terser\n${error.message}`);
}
static buildWarning(
warning,
file,
sourceMap,
requestShortener,
warningsFilter
) {
let warningMessage = warning;
let locationMessage = '';
let source = null;
if (sourceMap) {
const match = warningRegex.exec(warning);
if (match) {
const line = +match[1];
const column = +match[2];
const original = sourceMap.originalPositionFor({
line,
column,
});
if (
original &&
original.source &&
original.source !== file &&
requestShortener
) {
({ source } = original);
warningMessage = `${warningMessage.replace(warningRegex, '')}`;
locationMessage = `[${requestShortener.shorten(original.source)}:${
original.line
},${original.column}]`;
}
}
}
// Todo change order in next major release
if (warningsFilter && !warningsFilter(warning, source, file)) {
return null;
}
return `Terser Plugin: ${warningMessage}${locationMessage}`;
}
static removeQueryString(filename) {
let targetFilename = filename;
const queryStringIdx = targetFilename.indexOf('?');
if (queryStringIdx >= 0) {
targetFilename = targetFilename.substr(0, queryStringIdx);
}
return targetFilename;
}
static hasAsset(commentFilename, assets) {
const assetFilenames = Object.keys(assets).map((assetFilename) =>
TerserPlugin.removeQueryString(assetFilename)
);
return assetFilenames.includes(
TerserPlugin.removeQueryString(commentFilename)
);
}
static isWebpack4() {
return webpackVersion[0] === '4';
}
apply(compiler) {
const { devtool, output, plugins } = compiler.options;
this.options.sourceMap =
typeof this.options.sourceMap === 'undefined'
? (devtool &&
!devtool.includes('eval') &&
!devtool.includes('cheap') &&
(devtool.includes('source-map') ||
// Todo remove when `webpack@5` support will be dropped
devtool.includes('sourcemap'))) ||
(plugins &&
plugins.some(
(plugin) =>
plugin instanceof SourceMapDevToolPlugin &&
plugin.options &&
plugin.options.columns
))
: Boolean(this.options.sourceMap);
if (
typeof this.options.terserOptions.module === 'undefined' &&
typeof output.module !== 'undefined'
) {
this.options.terserOptions.module = output.module;
}
if (
typeof this.options.terserOptions.ecma === 'undefined' &&
typeof output.ecmaVersion !== 'undefined'
) {
this.options.terserOptions.ecma = output.ecmaVersion;
}
const optimizeFn = async (compilation, chunks) => {
const processedAssets = new WeakSet();
const matchObject = ModuleFilenameHelpers.matchObject.bind(
// eslint-disable-next-line no-undefined
undefined,
this.options
);
const additionalChunkAssets = Array.from(
compilation.additionalChunkAssets || []
);
const filteredChunks = Array.from(chunks).filter(
(chunk) => this.options.chunkFilter && this.options.chunkFilter(chunk)
);
const chunksFiles = filteredChunks.reduce(
(acc, chunk) => acc.concat(Array.from(chunk.files || [])),
[]
);
const files = [].concat(additionalChunkAssets).concat(chunksFiles);
const tasks = [];
files.forEach((file) => {
if (!matchObject(file)) {
return;
}
let inputSourceMap;
const asset = compilation.assets[file];
if (processedAssets.has(asset)) {
return;
}
try {
let input;
if (this.options.sourceMap && asset.sourceAndMap) {
const { source, map } = asset.sourceAndMap();
input = source;
if (TerserPlugin.isSourceMap(map)) {
inputSourceMap = map;
} else {
inputSourceMap = map;
compilation.warnings.push(
new Error(`${file} contains invalid source map`)
);
}
} else {
input = asset.source();
inputSourceMap = null;
}
// Handling comment extraction
let commentsFilename = false;
if (this.options.extractComments) {
commentsFilename =
this.options.extractComments.filename ||
'[file].LICENSE.txt[query]';
if (TerserPlugin.isWebpack4()) {
// Todo remove this in next major release
if (typeof commentsFilename === 'function') {
commentsFilename = commentsFilename.bind(null, file);
}
}
let query = '';
let filename = file;
const querySplit = filename.indexOf('?');
if (querySplit >= 0) {
query = filename.substr(querySplit);
filename = filename.substr(0, querySplit);
}
const lastSlashIndex = filename.lastIndexOf('/');
const basename =
lastSlashIndex === -1
? filename
: filename.substr(lastSlashIndex + 1);
const data = { filename, basename, query };
commentsFilename = compilation.getPath(commentsFilename, data);
}
if (
commentsFilename &&
TerserPlugin.hasAsset(commentsFilename, compilation.assets)
) {
// Todo make error and stop uglifing in next major release
compilation.warnings.push(
new Error(
`The comment file "${TerserPlugin.removeQueryString(
commentsFilename
)}" conflicts with an existing asset, this may lead to code corruption, please use a different name`
)
);
}
const task = {
asset,
file,
input,
inputSourceMap,
commentsFilename,
extractComments: this.options.extractComments,
terserOptions: this.options.terserOptions,
minify: this.options.minify,
};
if (TerserPlugin.isWebpack4()) {
if (this.options.cache) {
const defaultCacheKeys = {
terser: terserPackageJson.version,
// eslint-disable-next-line global-require
'terser-webpack-plugin': require('../package.json').version,
'terser-webpack-plugin-options': this.options,
nodeVersion: process.version,
filename: file,
contentHash: crypto
.createHash('md4')
.update(input)
.digest('hex'),
};
task.cacheKeys = this.options.cacheKeys(defaultCacheKeys, file);
}
} else {
task.cacheKeys = {
terser: terserPackageJson.version,
// eslint-disable-next-line global-require
'terser-webpack-plugin': require('../package.json').version,
'terser-webpack-plugin-options': this.options,
};
}
tasks.push(task);
} catch (error) {
compilation.errors.push(
TerserPlugin.buildError(
error,
file,
TerserPlugin.buildSourceMap(inputSourceMap),
new RequestShortener(compiler.context)
)
);
}
});
if (tasks.length === 0) {
return Promise.resolve();
}
const CacheEngine = TerserPlugin.isWebpack4()
? // eslint-disable-next-line global-require
require('./Webpack4Cache').default
: // eslint-disable-next-line global-require
require('./Webpack5Cache').default;
const taskRunner = new TaskRunner({
cache: new CacheEngine(compilation, this.options),
parallel: this.options.parallel,
});
const completedTasks = await taskRunner.run(tasks);
await taskRunner.exit();
completedTasks.forEach((completedTask, index) => {
const { file, input, inputSourceMap, commentsFilename } = tasks[index];
const { error, map, code, warnings } = completedTask;
let { extractedComments } = completedTask;
let sourceMap = null;
if (error || (warnings && warnings.length > 0)) {
sourceMap = TerserPlugin.buildSourceMap(inputSourceMap);
}
// Handling results
// Error case: add errors, and go to next file
if (error) {
compilation.errors.push(
TerserPlugin.buildError(
error,
file,
sourceMap,
new RequestShortener(compiler.context)
)
);
return;
}
let outputSource;
if (map) {
outputSource = new SourceMapSource(
code,
file,
map,
input,
inputSourceMap,
true
);
} else {
outputSource = new RawSource(code);
}
// Write extracted comments to commentsFilename
if (
commentsFilename &&
extractedComments &&
extractedComments.length > 0
) {
if (commentsFilename in compilation.assets) {
const commentsFileSource = compilation.assets[
commentsFilename
].source();
extractedComments = extractedComments.filter(
(comment) => !commentsFileSource.includes(comment)
);
}
if (extractedComments.length > 0) {
// Add a banner to the original file
if (this.options.extractComments.banner !== false) {
let banner =
this.options.extractComments.banner ||
`For license information please see ${path
.relative(path.dirname(file), commentsFilename)
.replace(/\\/g, '/')}`;
if (typeof banner === 'function') {
banner = banner(commentsFilename);
}
if (banner) {
outputSource = new ConcatSource(
`/*! ${banner} */\n`,
outputSource
);
}
}
const commentsSource = new RawSource(
`${extractedComments.join('\n\n')}\n`
);
if (commentsFilename in compilation.assets) {
// commentsFile already exists, append new comments...
if (
compilation.assets[commentsFilename] instanceof ConcatSource
) {
compilation.assets[commentsFilename].add('\n');
compilation.assets[commentsFilename].add(commentsSource);
} else {
// eslint-disable-next-line no-param-reassign
compilation.assets[commentsFilename] = new ConcatSource(
compilation.assets[commentsFilename],
'\n',
commentsSource
);
}
} else {
// eslint-disable-next-line no-param-reassign
compilation.assets[commentsFilename] = commentsSource;
}
}
}
// Updating assets
// eslint-disable-next-line no-param-reassign
processedAssets.add((compilation.assets[file] = outputSource));
// Handling warnings
if (warnings && warnings.length > 0) {
warnings.forEach((warning) => {
const builtWarning = TerserPlugin.buildWarning(
warning,
file,
sourceMap,
new RequestShortener(compiler.context),
this.options.warningsFilter
);
if (builtWarning) {
compilation.warnings.push(builtWarning);
}
});
}
});
return Promise.resolve();
};
const plugin = { name: this.constructor.name };
compiler.hooks.compilation.tap(plugin, (compilation) => {
if (this.options.sourceMap) {
compilation.hooks.buildModule.tap(plugin, (moduleArg) => {
// to get detailed location info about errors
// eslint-disable-next-line no-param-reassign
moduleArg.useSourceMap = true;
});
}
if (!TerserPlugin.isWebpack4()) {
const hooks = javascript.JavascriptModulesPlugin.getCompilationHooks(
compilation
);
const data = serialize({
terser: terserPackageJson.version,
terserOptions: this.options.terserOptions,
});
hooks.chunkHash.tap(plugin, (chunk, hash) => {
hash.update('TerserPlugin');
hash.update(data);
});
} else {
// Todo remove after drop `webpack@4` compatibility
const { mainTemplate, chunkTemplate } = compilation;
const data = serialize({
terser: terserPackageJson.version,
terserOptions: this.options.terserOptions,
});
// Regenerate `contenthash` for minified assets
for (const template of [mainTemplate, chunkTemplate]) {
template.hooks.hashForChunk.tap(plugin, (hash) => {
hash.update('TerserPlugin');
hash.update(data);
});
}
}
compilation.hooks.optimizeChunkAssets.tapPromise(
plugin,
optimizeFn.bind(this, compilation)
);
});
}
}
export default TerserPlugin;