source: trip-planner-front/node_modules/webpack/lib/runtime/AsyncModuleRuntimeModule.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
*/

"use strict";

const RuntimeGlobals = require("../RuntimeGlobals");
const Template = require("../Template");
const HelperRuntimeModule = require("./HelperRuntimeModule");

class AsyncModuleRuntimeModule extends HelperRuntimeModule {
        constructor() {
                super("async module");
        }

        /**
         * @returns {string} runtime code
         */
        generate() {
                const { runtimeTemplate } = this.compilation;
                const fn = RuntimeGlobals.asyncModule;
                return Template.asString([
                        'var webpackThen = typeof Symbol === "function" ? Symbol("webpack then") : "__webpack_then__";',
                        'var webpackExports = typeof Symbol === "function" ? Symbol("webpack exports") : "__webpack_exports__";',
                        `var completeQueue = ${runtimeTemplate.basicFunction("queue", [
                                "if(queue) {",
                                Template.indent([
                                        `queue.forEach(${runtimeTemplate.expressionFunction(
                                                "fn.r--",
                                                "fn"
                                        )});`,
                                        `queue.forEach(${runtimeTemplate.expressionFunction(
                                                "fn.r-- ? fn.r++ : fn()",
                                                "fn"
                                        )});`
                                ]),
                                "}"
                        ])}`,
                        `var completeFunction = ${runtimeTemplate.expressionFunction(
                                "!--fn.r && fn()",
                                "fn"
                        )};`,
                        `var queueFunction = ${runtimeTemplate.expressionFunction(
                                "queue ? queue.push(fn) : completeFunction(fn)",
                                "queue, fn"
                        )};`,
                        `var wrapDeps = ${runtimeTemplate.returningFunction(
                                `deps.map(${runtimeTemplate.basicFunction("dep", [
                                        'if(dep !== null && typeof dep === "object") {',
                                        Template.indent([
                                                "if(dep[webpackThen]) return dep;",
                                                "if(dep.then) {",
                                                Template.indent([
                                                        "var queue = [];",
                                                        `dep.then(${runtimeTemplate.basicFunction("r", [
                                                                "obj[webpackExports] = r;",
                                                                "completeQueue(queue);",
                                                                "queue = 0;"
                                                        ])});`,
                                                        `var obj = {};
                                                        obj[webpackThen] = ${runtimeTemplate.expressionFunction(
                                                                "queueFunction(queue, fn), dep.catch(reject)",
                                                                "fn, reject"
                                                        )};`,
                                                        "return obj;"
                                                ]),
                                                "}"
                                        ]),
                                        "}",
                                        `var ret = {};
                                        ret[webpackThen] = ${runtimeTemplate.expressionFunction(
                                                "completeFunction(fn)",
                                                "fn"
                                        )};
                                        ret[webpackExports] = dep;
                                        return ret;`
                                ])})`,
                                "deps"
                        )};`,
                        `${fn} = ${runtimeTemplate.basicFunction("module, body, hasAwait", [
                                "var queue = hasAwait && [];",
                                "var exports = module.exports;",
                                "var currentDeps;",
                                "var outerResolve;",
                                "var reject;",
                                "var isEvaluating = true;",
                                "var nested = false;",
                                `var whenAll = ${runtimeTemplate.basicFunction(
                                        "deps, onResolve, onReject",
                                        [
                                                "if (nested) return;",
                                                "nested = true;",
                                                "onResolve.r += deps.length;",
                                                `deps.map(${runtimeTemplate.expressionFunction(
                                                        "dep[webpackThen](onResolve, onReject)",
                                                        "dep, i"
                                                )});`,
                                                "nested = false;"
                                        ]
                                )};`,
                                `var promise = new Promise(${runtimeTemplate.basicFunction(
                                        "resolve, rej",
                                        [
                                                "reject = rej;",
                                                `outerResolve = ${runtimeTemplate.expressionFunction(
                                                        "resolve(exports), completeQueue(queue), queue = 0"
                                                )};`
                                        ]
                                )});`,
                                "promise[webpackExports] = exports;",
                                `promise[webpackThen] = ${runtimeTemplate.basicFunction(
                                        "fn, rejectFn",
                                        [
                                                "if (isEvaluating) { return completeFunction(fn); }",
                                                "if (currentDeps) whenAll(currentDeps, fn, rejectFn);",
                                                "queueFunction(queue, fn);",
                                                "promise.catch(rejectFn);"
                                        ]
                                )};`,
                                "module.exports = promise;",
                                `body(${runtimeTemplate.basicFunction("deps", [
                                        "if(!deps) return outerResolve();",
                                        "currentDeps = wrapDeps(deps);",
                                        "var fn, result;",
                                        `var promise = new Promise(${runtimeTemplate.basicFunction(
                                                "resolve, reject",
                                                [
                                                        `fn = ${runtimeTemplate.expressionFunction(
                                                                `resolve(result = currentDeps.map(${runtimeTemplate.returningFunction(
                                                                        "d[webpackExports]",
                                                                        "d"
                                                                )}))`
                                                        )};`,
                                                        "fn.r = 0;",
                                                        "whenAll(currentDeps, fn, reject);"
                                                ]
                                        )});`,
                                        "return fn.r ? promise : result;"
                                ])}).then(outerResolve, reject);`,
                                "isEvaluating = false;"
                        ])};`
                ]);
        }
}

module.exports = AsyncModuleRuntimeModule;