webpack/lib/performance/SizeLimitsPlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support 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 Sean Larkin @thelarkinn
*/
"use strict";
const EntrypointsOverSizeLimitWarning = require("./EntrypointsOverSizeLimitWarning");
const AssetsOverSizeLimitWarning = require("./AssetsOverSizeLimitWarning");
const NoAsyncChunksWarning = require("./NoAsyncChunksWarning");

/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Entrypoint")} Entrypoint */

module.exports = class SizeLimitsPlugin {
	constructor(options) {
		this.hints = options.hints;
		this.maxAssetSize = options.maxAssetSize;
		this.maxEntrypointSize = options.maxEntrypointSize;
		this.assetFilter = options.assetFilter;
	}

	/**
	 * @param {Compiler} compiler webpack compiler
	 * @returns {void}
	 */
	apply(compiler) {
		const entrypointSizeLimit = this.maxEntrypointSize;
		const assetSizeLimit = this.maxAssetSize;
		const hints = this.hints;
		const assetFilter =
			this.assetFilter || ((name, source, info) => !info.development);

		compiler.hooks.afterEmit.tap("SizeLimitsPlugin", compilation => {
			const warnings = [];

			/**
			 * @param {Entrypoint} entrypoint an entrypoint
			 * @returns {number} the size of the entrypoint
			 */
			const getEntrypointSize = entrypoint =>
				entrypoint.getFiles().reduce((currentSize, file) => {
					const asset = compilation.getAsset(file);
					if (
						asset &&
						assetFilter(asset.name, asset.source, asset.info) &&
						asset.source
					) {
						return currentSize + (asset.info.size || asset.source.size());
					}

					return currentSize;
				}, 0);

			const assetsOverSizeLimit = [];
			for (const { name, source, info } of compilation.getAssets()) {
				if (!assetFilter(name, source, info) || !source) {
					continue;
				}

				const size = info.size || source.size();
				if (size > assetSizeLimit) {
					assetsOverSizeLimit.push({
						name,
						size
					});
					/** @type {any} */ (source).isOverSizeLimit = true;
				}
			}

			const fileFilter = name => {
				const asset = compilation.getAsset(name);
				return asset && assetFilter(asset.name, asset.source, asset.info);
			};

			const entrypointsOverLimit = [];
			for (const [name, entry] of compilation.entrypoints) {
				const size = getEntrypointSize(entry);

				if (size > entrypointSizeLimit) {
					entrypointsOverLimit.push({
						name: name,
						size: size,
						files: entry.getFiles().filter(fileFilter)
					});
					/** @type {any} */ (entry).isOverSizeLimit = true;
				}
			}

			if (hints) {
				// 1. Individual Chunk: Size < 250kb
				// 2. Collective Initial Chunks [entrypoint] (Each Set?): Size < 250kb
				// 3. No Async Chunks
				// if !1, then 2, if !2 return
				if (assetsOverSizeLimit.length > 0) {
					warnings.push(
						new AssetsOverSizeLimitWarning(assetsOverSizeLimit, assetSizeLimit)
					);
				}
				if (entrypointsOverLimit.length > 0) {
					warnings.push(
						new EntrypointsOverSizeLimitWarning(
							entrypointsOverLimit,
							entrypointSizeLimit
						)
					);
				}

				if (warnings.length > 0) {
					const hasAsyncChunks =
						compilation.chunks.filter(chunk => !chunk.canBeInitial()).length >
						0;

					if (!hasAsyncChunks) {
						warnings.push(new NoAsyncChunksWarning());
					}

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