webpack/lib/DllReferencePlugin.js

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
"use strict";

const parseJson = require("json-parse-better-errors");
const DelegatedSourceDependency = require("./dependencies/DelegatedSourceDependency");
const DelegatedModuleFactoryPlugin = require("./DelegatedModuleFactoryPlugin");
const ExternalModuleFactoryPlugin = require("./ExternalModuleFactoryPlugin");
const DelegatedExportsDependency = require("./dependencies/DelegatedExportsDependency");
const NullFactory = require("./NullFactory");
const makePathsRelative = require("./util/identifier").makePathsRelative;
const WebpackError = require("./WebpackError");

const validateOptions = require("schema-utils");
const schema = require("../schemas/plugins/DllReferencePlugin.json");

class DllReferencePlugin {
	constructor(options) {
		validateOptions(schema, options, "Dll Reference Plugin");
		this.options = options;
	}

	apply(compiler) {
		compiler.hooks.compilation.tap(
			"DllReferencePlugin",
			(compilation, { normalModuleFactory }) => {
				compilation.dependencyFactories.set(
					DelegatedSourceDependency,
					normalModuleFactory
				);
				compilation.dependencyFactories.set(
					DelegatedExportsDependency,
					new NullFactory()
				);
			}
		);

		compiler.hooks.beforeCompile.tapAsync(
			"DllReferencePlugin",
			(params, callback) => {
				const manifest = this.options.manifest;
				if (typeof manifest === "string") {
					params.compilationDependencies.add(manifest);
					compiler.inputFileSystem.readFile(manifest, (err, result) => {
						if (err) return callback(err);
						// Catch errors parsing the manifest so that blank
						// or malformed manifest files don't kill the process.
						try {
							params["dll reference " + manifest] = parseJson(
								result.toString("utf-8")
							);
						} catch (e) {
							// Store the error in the params so that it can
							// be added as a compilation error later on.
							const manifestPath = makePathsRelative(
								compiler.options.context,
								manifest
							);
							params[
								"dll reference parse error " + manifest
							] = new DllManifestError(manifestPath, e.message);
						}
						return callback();
					});
				} else {
					return callback();
				}
			}
		);

		compiler.hooks.compile.tap("DllReferencePlugin", params => {
			let manifest = this.options.manifest;
			if (typeof manifest === "string") {
				// If there was an error parsing the manifest
				// file, exit now because the error will be added
				// as a compilation error in the "compilation" hook.
				if (params["dll reference parse error " + manifest]) {
					return;
				}
				manifest = params["dll reference " + manifest];
			}
			const name = this.options.name || manifest.name;
			const sourceType =
				this.options.sourceType || (manifest && manifest.type) || "var";
			const externals = {};
			const source = "dll-reference " + name;
			externals[source] = name;
			const normalModuleFactory = params.normalModuleFactory;
			new ExternalModuleFactoryPlugin(sourceType, externals).apply(
				normalModuleFactory
			);
			new DelegatedModuleFactoryPlugin({
				source: source,
				type: this.options.type,
				scope: this.options.scope,
				context: this.options.context || compiler.options.context,
				content: this.options.content || manifest.content,
				extensions: this.options.extensions
			}).apply(normalModuleFactory);
		});

		compiler.hooks.compilation.tap(
			"DllReferencePlugin",
			(compilation, params) => {
				let manifest = this.options.manifest;
				if (typeof manifest === "string") {
					// If there was an error parsing the manifest file, add the
					// error as a compilation error to make the compilation fail.
					let e = params["dll reference parse error " + manifest];
					if (e) {
						compilation.errors.push(e);
					}
				}
			}
		);
	}
}

class DllManifestError extends WebpackError {
	constructor(filename, message) {
		super();

		this.name = "DllManifestError";
		this.message = `Dll manifest ${filename}\n${message}`;

		Error.captureStackTrace(this, this.constructor);
	}
}

module.exports = DllReferencePlugin;