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BannerPlugin.js
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Mon, Nov 18, 08:26

BannerPlugin.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { validate } = require("schema-utils");
const { ConcatSource } = require("webpack-sources");
const Compilation = require("./Compilation");
const ModuleFilenameHelpers = require("./ModuleFilenameHelpers");
const Template = require("./Template");
const schema = require("../schemas/plugins/BannerPlugin.json");
/** @typedef {import("../declarations/plugins/BannerPlugin").BannerPluginArgument} BannerPluginArgument */
/** @typedef {import("../declarations/plugins/BannerPlugin").BannerPluginOptions} BannerPluginOptions */
/** @typedef {import("./Compiler")} Compiler */
const wrapComment = str => {
if (!str.includes("\n")) {
return Template.toComment(str);
}
return `/*!\n * ${str
.replace(/\*\//g, "* /")
.split("\n")
.join("\n * ")
.replace(/\s+\n/g, "\n")
.trimRight()}\n */`;
};
class BannerPlugin {
/**
* @param {BannerPluginArgument} options options object
*/
constructor(options) {
if (typeof options === "string" || typeof options === "function") {
options = {
banner: options
};
}
validate(schema, options, {
name: "Banner Plugin",
baseDataPath: "options"
});
this.options = options;
const bannerOption = options.banner;
if (typeof bannerOption === "function") {
const getBanner = bannerOption;
this.banner = this.options.raw
? getBanner
: data => wrapComment(getBanner(data));
} else {
const banner = this.options.raw
? bannerOption
: wrapComment(bannerOption);
this.banner = () => banner;
}
}
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
const options = this.options;
const banner = this.banner;
const matchObject = ModuleFilenameHelpers.matchObject.bind(
undefined,
options
);
compiler.hooks.compilation.tap("BannerPlugin", compilation => {
compilation.hooks.processAssets.tap(
{
name: "BannerPlugin",
stage: Compilation.PROCESS_ASSETS_STAGE_ADDITIONS
},
() => {
for (const chunk of compilation.chunks) {
if (options.entryOnly && !chunk.canBeInitial()) {
continue;
}
for (const file of chunk.files) {
if (!matchObject(file)) {
continue;
}
const data = {
chunk,
filename: file
};
const comment = compilation.getPath(banner, data);
compilation.updateAsset(
file,
old => new ConcatSource(comment, "\n", old)
);
}
}
}
);
});
}
}
module.exports = BannerPlugin;

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