webpack/lib/dependencies/RequireEnsureDependency.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 Tobias Koppers @sokra
*/

"use strict";

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

/** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
/** @typedef {import("../AsyncDependenciesBlock")} AsyncDependenciesBlock */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
/** @typedef {import("../javascript/JavascriptParser").Range} Range */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
/** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */

class RequireEnsureDependency extends NullDependency {
	/**
	 * @param {Range} range range
	 * @param {Range} contentRange content range
	 * @param {Range | false} errorHandlerRange error handler range
	 */
	constructor(range, contentRange, errorHandlerRange) {
		super();

		this.range = range;
		this.contentRange = contentRange;
		this.errorHandlerRange = errorHandlerRange;
	}

	get type() {
		return "require.ensure";
	}

	/**
	 * @param {ObjectSerializerContext} context context
	 */
	serialize(context) {
		const { write } = context;

		write(this.range);
		write(this.contentRange);
		write(this.errorHandlerRange);

		super.serialize(context);
	}

	/**
	 * @param {ObjectDeserializerContext} context context
	 */
	deserialize(context) {
		const { read } = context;

		this.range = read();
		this.contentRange = read();
		this.errorHandlerRange = read();

		super.deserialize(context);
	}
}

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

RequireEnsureDependency.Template = class RequireEnsureDependencyTemplate extends (
	NullDependency.Template
) {
	/**
	 * @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,
		{ runtimeTemplate, moduleGraph, chunkGraph, runtimeRequirements }
	) {
		const dep = /** @type {RequireEnsureDependency} */ (dependency);
		const depBlock = /** @type {AsyncDependenciesBlock} */ (
			moduleGraph.getParentBlock(dep)
		);
		const promise = runtimeTemplate.blockPromise({
			chunkGraph,
			block: depBlock,
			message: "require.ensure",
			runtimeRequirements
		});
		const range = dep.range;
		const contentRange = dep.contentRange;
		const errorHandlerRange = dep.errorHandlerRange;
		source.replace(range[0], contentRange[0] - 1, `${promise}.then((`);
		if (errorHandlerRange) {
			source.replace(
				contentRange[1],
				errorHandlerRange[0] - 1,
				`).bind(null, ${RuntimeGlobals.require}))['catch'](`
			);
			source.replace(errorHandlerRange[1], range[1] - 1, ")");
		} else {
			source.replace(
				contentRange[1],
				range[1] - 1,
				`).bind(null, ${RuntimeGlobals.require}))['catch'](${RuntimeGlobals.uncaughtErrorHandler})`
			);
		}
	}
};

module.exports = RequireEnsureDependency;