init

马宇豪

2024-07-16 f591c27b57e2418c9495bc02ae8cfff84d35bc18

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Tobias Koppers @sokra
*/
 
"use strict";
 
const InitFragment = require("../InitFragment");
const RuntimeGlobals = require("../RuntimeGlobals");
const Template = require("../Template");
 
/** @typedef {import("webpack-sources").Source} Source */
/** @typedef {import("../Generator").GenerateContext} GenerateContext */
 
/**
 * @typedef {GenerateContext} Context
 */
class AwaitDependenciesInitFragment extends InitFragment {
    /**
     * @param {Set<string>} promises the promises that should be awaited
     */
    constructor(promises) {
        super(
            undefined,
            InitFragment.STAGE_ASYNC_DEPENDENCIES,
            0,
            "await-dependencies"
        );
        this.promises = promises;
    }
 
    merge(other) {
        const promises = new Set(other.promises);
        for (const p of this.promises) {
            promises.add(p);
        }
        return new AwaitDependenciesInitFragment(promises);
    }
 
    /**
     * @param {Context} context context
     * @returns {string|Source} the source code that will be included as initialization code
     */
    getContent({ runtimeRequirements }) {
        runtimeRequirements.add(RuntimeGlobals.module);
        const promises = this.promises;
        if (promises.size === 0) {
            return "";
        }
        if (promises.size === 1) {
            for (const p of promises) {
                return Template.asString([
                    `var __webpack_async_dependencies__ = __webpack_handle_async_dependencies__([${p}]);`,
                    `${p} = (__webpack_async_dependencies__.then ? (await __webpack_async_dependencies__)() : __webpack_async_dependencies__)[0];`,
                    ""
                ]);
            }
        }
        const sepPromises = Array.from(promises).join(", ");
        // TODO check if destructuring is supported
        return Template.asString([
            `var __webpack_async_dependencies__ = __webpack_handle_async_dependencies__([${sepPromises}]);`,
            `([${sepPromises}] = __webpack_async_dependencies__.then ? (await __webpack_async_dependencies__)() : __webpack_async_dependencies__);`,
            ""
        ]);
    }
}
 
module.exports = AwaitDependenciesInitFragment;