88 lines
2.5 KiB
JavaScript
88 lines
2.5 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const InitFragment = require("../InitFragment");
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const RuntimeGlobals = require("../RuntimeGlobals");
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const Template = require("../Template");
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/** @typedef {import("webpack-sources").Source} Source */
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/** @typedef {import("../Generator").GenerateContext} GenerateContext */
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/**
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* @extends {InitFragment<GenerateContext>}
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*/
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class AwaitDependenciesInitFragment extends InitFragment {
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/**
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* @param {Map<string, string>} dependencies maps an import var to an async module that needs to be awaited
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*/
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constructor(dependencies) {
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super(
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undefined,
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InitFragment.STAGE_ASYNC_DEPENDENCIES,
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0,
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"await-dependencies"
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);
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this.dependencies = dependencies;
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}
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/**
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* @param {AwaitDependenciesInitFragment} other other AwaitDependenciesInitFragment
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* @returns {AwaitDependenciesInitFragment} AwaitDependenciesInitFragment
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*/
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merge(other) {
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const dependencies = new Map(other.dependencies);
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for (const [key, value] of this.dependencies) {
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dependencies.set(key, value);
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}
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return new AwaitDependenciesInitFragment(dependencies);
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}
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/**
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* @param {GenerateContext} context context
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* @returns {string | Source | undefined} the source code that will be included as initialization code
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*/
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getContent({ runtimeRequirements, runtimeTemplate }) {
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runtimeRequirements.add(RuntimeGlobals.module);
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if (this.dependencies.size === 0) {
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return "";
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}
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const importVars = [...this.dependencies.keys()];
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const asyncModuleValues = [...this.dependencies.values()].join(", ");
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const templateInput = [
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`var __webpack_async_dependencies__ = __webpack_handle_async_dependencies__([${asyncModuleValues}]);`
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];
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if (
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this.dependencies.size === 1 ||
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!runtimeTemplate.supportsDestructuring()
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) {
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templateInput.push(
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"var __webpack_async_dependencies_result__ = (__webpack_async_dependencies__.then ? (await __webpack_async_dependencies__)() : __webpack_async_dependencies__);"
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);
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for (const [index, importVar] of importVars.entries()) {
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templateInput.push(
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`${importVar} = __webpack_async_dependencies_result__[${index}];`
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);
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}
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} else {
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const importVarsStr = importVars.join(", ");
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templateInput.push(
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`([${importVarsStr}] = __webpack_async_dependencies__.then ? (await __webpack_async_dependencies__)() : __webpack_async_dependencies__);`
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);
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}
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templateInput.push("");
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return Template.asString(templateInput);
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}
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}
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module.exports = AwaitDependenciesInitFragment;
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