source: frontend/node_modules/webpack/lib/dependencies/RequireEnsureDependency.js

/*
        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 {
        /**
         * Creates an instance of RequireEnsureDependency.
         * @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";
        }

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

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

                super.serialize(context);
        }

        /**
         * Restores this instance from the provided deserializer 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
) {
        /**
         * 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,
                { 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;