BannerPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const ConcatSource = require("webpack-sources").ConcatSource;
const ModuleFilenameHelpers = require("./ModuleFilenameHelpers");
const wrapComment = (str) => {
if(!str.includes("\n")) return `/*! ${str} */`;
return `/*!\n * ${str.split("\n").join("\n * ")}\n */`;
};
class BannerPlugin {
constructor(options) {
if(arguments.length > 1)
throw new Error("BannerPlugin only takes one argument (pass an options object)");
if(typeof options === "string")
options = {
banner: options
};
this.options = options || {};
this.banner = this.options.raw ? options.banner : wrapComment(options.banner);
}
apply(compiler) {
const options = this.options;
const banner = this.banner;
compiler.plugin("compilation", (compilation) => {
compilation.plugin("optimize-chunk-assets", (chunks, callback) => {
chunks.forEach((chunk) => {
if(options.entryOnly && !chunk.isInitial()) return;
chunk.files
.filter(ModuleFilenameHelpers.matchObject.bind(undefined, options))
.forEach((file) => {
let basename;
let query = "";
let filename = file;
const hash = compilation.hash;
const querySplit = filename.indexOf("?");
if(querySplit >= 0) {
query = filename.substr(querySplit);
filename = filename.substr(0, querySplit);
}
const lastSlashIndex = filename.lastIndexOf("/");
if(lastSlashIndex === -1) {
basename = filename;
} else {
basename = filename.substr(lastSlashIndex + 1);
}
const comment = compilation.getPath(banner, {
hash,
chunk,
filename,
basename,
query,
});
return compilation.assets[file] = new ConcatSource(comment, "\n", compilation.assets[file]);
});
});
callback();
});
});
}
}
module.exports = BannerPlugin;