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January 18, 2023 20:50
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/*
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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 path = require("path");
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const DescriptionFileUtils = require("./DescriptionFileUtils");
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/** @typedef {import("./Resolver")} Resolver */
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/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
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/** @typedef {{name: string|Array<string>, forceRelative: boolean}} MainFieldOptions */
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const alreadyTriedMainField = Symbol("alreadyTriedMainField");
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module.exports = class MainFieldPlugin {
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/**
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* @param {string | ResolveStepHook} source source
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* @param {MainFieldOptions} options options
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* @param {string | ResolveStepHook} target target
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*/
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constructor(source, options, target) {
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this.source = source;
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this.options = options;
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this.target = target;
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}
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/**
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* @param {Resolver} resolver the resolver
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* @returns {void}
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*/
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apply(resolver) {
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const target = resolver.ensureHook(this.target);
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resolver
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.getHook(this.source)
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.tapAsync("MainFieldPlugin", (request, resolveContext, callback) => {
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if (
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request.path !== request.descriptionFileRoot ||
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request[alreadyTriedMainField] === request.descriptionFilePath ||
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!request.descriptionFilePath
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)
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return callback();
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const filename = path.basename(request.descriptionFilePath);
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let mainModule = DescriptionFileUtils.getField(
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request.descriptionFileData,
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this.options.name
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);
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if (
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!mainModule ||
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typeof mainModule !== "string" ||
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mainModule === "." ||
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mainModule === "./"
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) {
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return callback();
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}
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if (this.options.forceRelative && !/^\.\.?\//.test(mainModule))
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mainModule = "./" + mainModule;
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const obj = {
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...request,
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request: mainModule,
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module: false,
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directory: mainModule.endsWith("/"),
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[alreadyTriedMainField]: request.descriptionFilePath
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};
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return resolver.doResolve(
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target,
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obj,
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"use " +
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mainModule +
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" from " +
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this.options.name +
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" in " +
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filename,
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resolveContext,
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callback
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);
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});
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}
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};