UglifyJsPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const SourceMapConsumer = require("source-map").SourceMapConsumer;
const SourceMapSource = require("webpack-sources").SourceMapSource;
const RawSource = require("webpack-sources").RawSource;
const RequestShortener = require("../RequestShortener");
const ModuleFilenameHelpers = require("../ModuleFilenameHelpers");
const uglify = require("uglify-js");
class UglifyJsPlugin {
constructor(options) {
if(typeof options !== "object" || Array.isArray(options)) options = {};
if(typeof options.compressor !== "undefined") options.compress = options.compressor;
this.options = options;
}
apply(compiler) {
let options = this.options;
options.test = options.test || /\.js($|\?)/i;
let requestShortener = new RequestShortener(compiler.context);
compiler.plugin("compilation", (compilation) => {
if(options.sourceMap) {
compilation.plugin("build-module", (module) => {
// to get detailed location info about errors
module.useSourceMap = true;
});
}
compilation.plugin("optimize-chunk-assets", (chunks, callback) => {
let files = [];
chunks.forEach((chunk) => files.push.apply(files, chunk.files));
files.push.apply(files, compilation.additionalChunkAssets);
files = files.filter(ModuleFilenameHelpers.matchObject.bind(undefined, options));
files.forEach((file) => {
let oldWarnFunction = uglify.AST_Node.warn_function;
let warnings = [];
let sourceMap;
try {
let asset = compilation.assets[file];
if(asset.__UglifyJsPlugin) {
compilation.assets[file] = asset.__UglifyJsPlugin;
return;
}
let input;
let inputSourceMap;
if(options.sourceMap) {
if(asset.sourceAndMap) {
let sourceAndMap = asset.sourceAndMap();
inputSourceMap = sourceAndMap.map;
input = sourceAndMap.source;
} else {
inputSourceMap = asset.map();
input = asset.source();
}
sourceMap = new SourceMapConsumer(inputSourceMap);
uglify.AST_Node.warn_function = (warning) => { // eslint-disable-line camelcase
let match = /\[.+:([0-9]+),([0-9]+)\]/.exec(warning);
let line = +match[1];
let column = +match[2];
let original = sourceMap.originalPositionFor({
line: line,
column: column
});
if(!original || !original.source || original.source === file) return;
warnings.push(warning.replace(/\[.+:([0-9]+),([0-9]+)\]/, "") +
"[" + requestShortener.shorten(original.source) + ":" + original.line + "," + original.column + "]");
};
} else {
input = asset.source();
uglify.AST_Node.warn_function = (warning) => { // eslint-disable-line camelcase
warnings.push(warning);
};
}
uglify.base54.reset();
let ast = uglify.parse(input, {
filename: file
});
if(options.compress !== false) {
ast.figure_out_scope();
let compress = uglify.Compressor(options.compress || {
warnings: false
}); // eslint-disable-line new-cap
ast = ast.transform(compress);
}
if(options.mangle !== false) {
ast.figure_out_scope(options.mangle || {});
ast.compute_char_frequency(options.mangle || {});
ast.mangle_names(options.mangle || {});
if(options.mangle && options.mangle.props) {
uglify.mangle_properties(ast, options.mangle.props);
}
}
let output = {};
output.comments = Object.prototype.hasOwnProperty.call(options, "comments") ? options.comments : /^\**!|@preserve|@license/;
output.beautify = options.beautify;
for(let k in options.output) {
output[k] = options.output[k];
}
let map;
if(options.sourceMap) {
map = uglify.SourceMap({ // eslint-disable-line new-cap
file: file,
root: ""
});
output.source_map = map; // eslint-disable-line camelcase
}
let stream = uglify.OutputStream(output); // eslint-disable-line new-cap
ast.print(stream);
if(map) map = map + "";
stream = stream + "";
asset.__UglifyJsPlugin = compilation.assets[file] = (map ?
new SourceMapSource(stream, file, JSON.parse(map), input, inputSourceMap) :
new RawSource(stream));
if(warnings.length > 0) {
compilation.warnings.push(new Error(file + " from UglifyJs\n" + warnings.join("\n")));
}
} catch(err) {
if(err.line) {
let original = sourceMap && sourceMap.originalPositionFor({
line: err.line,
column: err.col
});
if(original && original.source) {
compilation.errors.push(new Error(file + " from UglifyJs\n" + err.message + " [" + requestShortener.shorten(original.source) + ":" + original.line + "," + original.column + "][" + file + ":" + err.line + "," + err.col + "]"));
} else {
compilation.errors.push(new Error(file + " from UglifyJs\n" + err.message + " [" + file + ":" + err.line + "," + err.col + "]"));
}
} else if(err.msg) {
compilation.errors.push(new Error(file + " from UglifyJs\n" + err.msg));
} else
compilation.errors.push(new Error(file + " from UglifyJs\n" + err.stack));
} finally {
uglify.AST_Node.warn_function = oldWarnFunction; // eslint-disable-line camelcase
}
});
callback();
});
});
}
}
module.exports = UglifyJsPlugin;