webpack/lib/asset/AssetModulesPlugin.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 Yuta Hiroto @hiroppy
*/

"use strict";

const { cleverMerge } = require("../util/cleverMerge");
const { compareModulesByIdentifier } = require("../util/comparators");
const createSchemaValidation = require("../util/create-schema-validation");
const memoize = require("../util/memoize");

/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Module")} Module */

const getSchema = name => {
	const { definitions } = require("../../schemas/WebpackOptions.json");
	return {
		definitions,
		oneOf: [{ $ref: `#/definitions/${name}` }]
	};
};

const generatorValidationOptions = {
	name: "Asset Modules Plugin",
	baseDataPath: "generator"
};
const validateGeneratorOptions = {
	asset: createSchemaValidation(
		require("../../schemas/plugins/asset/AssetGeneratorOptions.check.js"),
		() => getSchema("AssetGeneratorOptions"),
		generatorValidationOptions
	),
	"asset/resource": createSchemaValidation(
		require("../../schemas/plugins/asset/AssetResourceGeneratorOptions.check.js"),
		() => getSchema("AssetResourceGeneratorOptions"),
		generatorValidationOptions
	),
	"asset/inline": createSchemaValidation(
		require("../../schemas/plugins/asset/AssetInlineGeneratorOptions.check.js"),
		() => getSchema("AssetInlineGeneratorOptions"),
		generatorValidationOptions
	)
};

const validateParserOptions = createSchemaValidation(
	require("../../schemas/plugins/asset/AssetParserOptions.check.js"),
	() => getSchema("AssetParserOptions"),
	{
		name: "Asset Modules Plugin",
		baseDataPath: "parser"
	}
);

const getAssetGenerator = memoize(() => require("./AssetGenerator"));
const getAssetParser = memoize(() => require("./AssetParser"));
const getAssetSourceParser = memoize(() => require("./AssetSourceParser"));
const getAssetSourceGenerator = memoize(() =>
	require("./AssetSourceGenerator")
);

const type = "asset";
const plugin = "AssetModulesPlugin";

class AssetModulesPlugin {
	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			plugin,
			(compilation, { normalModuleFactory }) => {
				normalModuleFactory.hooks.createParser
					.for("asset")
					.tap(plugin, parserOptions => {
						validateParserOptions(parserOptions);
						parserOptions = cleverMerge(
							compiler.options.module.parser.asset,
							parserOptions
						);

						let dataUrlCondition = parserOptions.dataUrlCondition;
						if (!dataUrlCondition || typeof dataUrlCondition === "object") {
							dataUrlCondition = {
								maxSize: 8096,
								...dataUrlCondition
							};
						}

						const AssetParser = getAssetParser();

						return new AssetParser(dataUrlCondition);
					});
				normalModuleFactory.hooks.createParser
					.for("asset/inline")
					.tap(plugin, parserOptions => {
						const AssetParser = getAssetParser();

						return new AssetParser(true);
					});
				normalModuleFactory.hooks.createParser
					.for("asset/resource")
					.tap(plugin, parserOptions => {
						const AssetParser = getAssetParser();

						return new AssetParser(false);
					});
				normalModuleFactory.hooks.createParser
					.for("asset/source")
					.tap(plugin, parserOptions => {
						const AssetSourceParser = getAssetSourceParser();

						return new AssetSourceParser();
					});

				for (const type of ["asset", "asset/inline", "asset/resource"]) {
					normalModuleFactory.hooks.createGenerator
						.for(type)
						.tap(plugin, generatorOptions => {
							validateGeneratorOptions[type](generatorOptions);

							let dataUrl = undefined;
							if (type !== "asset/resource") {
								dataUrl = generatorOptions.dataUrl;
								if (!dataUrl || typeof dataUrl === "object") {
									dataUrl = {
										encoding: undefined,
										mimetype: undefined,
										...dataUrl
									};
								}
							}

							let filename = undefined;
							let publicPath = undefined;
							if (type !== "asset/inline") {
								filename = generatorOptions.filename;
								publicPath = generatorOptions.publicPath;
							}

							const AssetGenerator = getAssetGenerator();

							return new AssetGenerator(
								dataUrl,
								filename,
								publicPath,
								generatorOptions.emit !== false
							);
						});
				}
				normalModuleFactory.hooks.createGenerator
					.for("asset/source")
					.tap(plugin, () => {
						const AssetSourceGenerator = getAssetSourceGenerator();

						return new AssetSourceGenerator();
					});

				compilation.hooks.renderManifest.tap(plugin, (result, options) => {
					const { chunkGraph } = compilation;
					const { chunk, codeGenerationResults } = options;

					const modules = chunkGraph.getOrderedChunkModulesIterableBySourceType(
						chunk,
						"asset",
						compareModulesByIdentifier
					);
					if (modules) {
						for (const module of modules) {
							try {
								const codeGenResult = codeGenerationResults.get(
									module,
									chunk.runtime
								);
								result.push({
									render: () => codeGenResult.sources.get(type),
									filename:
										module.buildInfo.filename ||
										codeGenResult.data.get("filename"),
									info:
										module.buildInfo.assetInfo ||
										codeGenResult.data.get("assetInfo"),
									auxiliary: true,
									identifier: `assetModule${chunkGraph.getModuleId(module)}`,
									hash:
										module.buildInfo.fullContentHash ||
										codeGenResult.data.get("fullContentHash")
								});
							} catch (e) {
								e.message += `\nduring rendering of asset ${module.identifier()}`;
								throw e;
							}
						}
					}

					return result;
				});

				compilation.hooks.prepareModuleExecution.tap(
					"AssetModulesPlugin",
					(options, context) => {
						const { codeGenerationResult } = options;
						const source = codeGenerationResult.sources.get("asset");
						if (source === undefined) return;
						context.assets.set(codeGenerationResult.data.get("filename"), {
							source,
							info: codeGenerationResult.data.get("assetInfo")
						});
					}
				);
			}
		);
	}
}

module.exports = AssetModulesPlugin;