webpack/lib/dependencies/ModuleInitFragmentDependency.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 Natsu @xiaoxiaojx
*/

"use strict";

const InitFragment = require("../InitFragment");
const makeSerializable = require("../util/makeSerializable");
const NullDependency = require("./NullDependency");

/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
/**
 * A dependency that adds an init fragment to the module
 */
class ModuleInitFragmentDependency extends NullDependency {
	/**
	 * Creates an instance of ModuleInitFragmentDependency.
	 * @param {string} initCode the initialization code
	 * @param {string[]} runtimeRequirements runtime requirements
	 * @param {string=} key unique key to avoid emitting the same initialization code twice
	 */
	constructor(initCode, runtimeRequirements, key) {
		super();
		this.initCode = initCode;
		this.runtimeRequirements = runtimeRequirements;
		this.key = key;
	}

	/**
	 * Serializes this instance into the provided serializer context.
	 * @param {ObjectSerializerContext} context context
	 */
	serialize(context) {
		const { write } = context;
		write(this.initCode);
		write(this.runtimeRequirements);
		write(this.key);
		super.serialize(context);
	}

	/**
	 * Restores this instance from the provided deserializer context.
	 * @param {ObjectDeserializerContext} context context
	 */
	deserialize(context) {
		const { read } = context;
		this.initCode = read();
		this.runtimeRequirements = read();
		this.key = read();
		super.deserialize(context);
	}
}

makeSerializable(
	ModuleInitFragmentDependency,
	"webpack/lib/dependencies/ModuleInitFragmentDependency"
);

ModuleInitFragmentDependency.Template = class ModuleInitFragmentDependencyTemplate extends (
	NullDependency.Template
) {
	/**
	 * Applies the plugin by registering its hooks on the compiler.
	 * @param {Dependency} dependency the dependency for which the template should be applied
	 * @param {ReplaceSource} source the current replace source which can be modified
	 * @param {DependencyTemplateContext} templateContext the context object
	 * @returns {void}
	 */
	apply(dependency, source, { initFragments, runtimeRequirements }) {
		const dep = /** @type {ModuleInitFragmentDependency} */ (dependency);
		for (const req of dep.runtimeRequirements) {
			runtimeRequirements.add(req);
		}
		initFragments.push(
			new InitFragment(
				dep.initCode,
				InitFragment.STAGE_CONSTANTS,
				0,
				dep.key,
				undefined
			)
		);
	}
};

module.exports = ModuleInitFragmentDependency;