webpack/lib/performance/EmbeddedSourceMapsPlugin.js

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Alexander Akait @alexander-akait
*/

"use strict";

const EmbeddedSourceMapsWarning = require("../errors/EmbeddedSourceMapsWarning");

/** @import { PerformanceOptions } from "../../declarations/WebpackOptions" */
/** @import Compiler from "../Compiler" */

const PLUGIN_NAME = "EmbeddedSourceMapsPlugin";

// The two families that put the map inside the bundle rather than beside it:
// `eval` carries one per module, `inline` appends the whole map as a data url.
const EMBEDS_MAP_REGEXP = /^eval|inline/;

class EmbeddedSourceMapsPlugin {
	/**
	 * Creates an instance of EmbeddedSourceMapsPlugin.
	 * @param {PerformanceOptions} options the plugin options
	 */
	constructor(options) {
		/** @type {PerformanceOptions["hints"]} */
		this.hints = options.hints;
	}

	/**
	 * Applies the plugin by registering its hooks on the compiler.
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		const hints = this.hints;

		if (!hints) return;

		const { devtool, mode } = compiler.options;

		// Only production: embedding is what these devtools are for everywhere
		// else, and the cost is only paid by the people loading the site.
		if (mode !== "production" || !devtool) return;

		// One devtool, or one per source type — either way it is the setting
		// that embeds which the report has to name.
		const embedding = (
			typeof devtool === "string" ? [devtool] : devtool.map((it) => it.use)
		).find((it) => typeof it === "string" && EMBEDS_MAP_REGEXP.test(it));

		if (!embedding) return;

		compiler.hooks.compilation.tap(PLUGIN_NAME, (compilation) => {
			// `afterSeal` is past the hash, which folds every message into it — a
			// hint reported earlier would change the build's identity.
			compilation.hooks.afterSeal.tap(PLUGIN_NAME, () => {
				const warning = new EmbeddedSourceMapsWarning(embedding);

				if (hints === "error") {
					compilation.errors.push(warning);
				} else if (hints === "stats") {
					compilation.hints.push(warning);
				} else {
					compilation.warnings.push(warning);
				}
			});
		});
	}
}

module.exports = EmbeddedSourceMapsPlugin;