webpack/lib/BannerPlugin.js

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
var ConcatSource = require("webpack-core/lib/ConcatSource");

function wrapComment(str) {
	if(str.indexOf("\n") < 0) return "/*! " + str + " */";
	return "/*!\n * " + str.split("\n").join("\n * ") + "\n */";
}

function BannerPlugin(banner, options) {
	if(!options) options = {};
	this.banner = options.raw ? banner : wrapComment(banner);
	this.entryOnly = options.entryOnly;
}
module.exports = BannerPlugin;
BannerPlugin.prototype.apply = function(compiler) {
	var banner = this.banner;
	var entryOnly = this.entryOnly;
	compiler.plugin("compilation", function(compilation) {
		compilation.plugin("optimize-chunk-assets", function(chunks, callback) {
			chunks.forEach(function(chunk) {
				if(entryOnly && !chunk.initial) return;
				chunk.files.forEach(function(file) {
					compilation.assets[file] = new ConcatSource(banner, "\n", compilation.assets[file]);
				});
			});
			callback();
		});
	});
};