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 path = require("path");
const DescriptionFileUtils = require("./DescriptionFileUtils");
 
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").JsonObject} JsonObject */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
 
/** @typedef {{name: string|Array<string>, forceRelative: boolean}} MainFieldOptions */
 
const alreadyTriedMainField = Symbol("alreadyTriedMainField");
 
module.exports = class MainFieldPlugin {
    /**
     * @param {string | ResolveStepHook} source source
     * @param {MainFieldOptions} options options
     * @param {string | ResolveStepHook} target target
     */
    constructor(source, options, target) {
        this.source = source;
        this.options = options;
        this.target = target;
    }
 
    /**
     * @param {Resolver} resolver the resolver
     * @returns {void}
     */
    apply(resolver) {
        const target = resolver.ensureHook(this.target);
        resolver
            .getHook(this.source)
            .tapAsync("MainFieldPlugin", (request, resolveContext, callback) => {
                if (
                    request.path !== request.descriptionFileRoot ||
                    /** @type {ResolveRequest & { [alreadyTriedMainField]?: string }} */
                    (request)[alreadyTriedMainField] === request.descriptionFilePath ||
                    !request.descriptionFilePath
                )
                    return callback();
                const filename = path.basename(request.descriptionFilePath);
                let mainModule =
                    /** @type {string|null|undefined} */
                    (
                        DescriptionFileUtils.getField(
                            /** @type {JsonObject} */ (request.descriptionFileData),
                            this.options.name
                        )
                    );
 
                if (
                    !mainModule ||
                    typeof mainModule !== "string" ||
                    mainModule === "." ||
                    mainModule === "./"
                ) {
                    return callback();
                }
                if (this.options.forceRelative && !/^\.\.?\//.test(mainModule))
                    mainModule = "./" + mainModule;
                /** @type {ResolveRequest & { [alreadyTriedMainField]?: string }} */
                const obj = {
                    ...request,
                    request: mainModule,
                    module: false,
                    directory: mainModule.endsWith("/"),
                    [alreadyTriedMainField]: request.descriptionFilePath
                };
                return resolver.doResolve(
                    target,
                    obj,
                    "use " +
                        mainModule +
                        " from " +
                        this.options.name +
                        " in " +
                        filename,
                    resolveContext,
                    callback
                );
            });
    }
};