102 lines
2.7 KiB
JavaScript
102 lines
2.7 KiB
JavaScript
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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 DescriptionFileUtils = require("./DescriptionFileUtils");
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const getInnerRequest = require("./getInnerRequest");
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/** @typedef {import("./Resolver")} Resolver */
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/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
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/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
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module.exports = class AliasFieldPlugin {
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/**
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* @param {string | ResolveStepHook} source source
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* @param {string | Array<string>} field field
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* @param {string | ResolveStepHook} target target
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*/
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constructor(source, field, target) {
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this.source = source;
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this.field = field;
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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("AliasFieldPlugin", (request, resolveContext, callback) => {
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if (!request.descriptionFileData) return callback();
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const innerRequest = getInnerRequest(resolver, request);
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if (!innerRequest) return callback();
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const fieldData = DescriptionFileUtils.getField(
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request.descriptionFileData,
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this.field
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);
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if (fieldData === null || typeof fieldData !== "object") {
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if (resolveContext.log)
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resolveContext.log(
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"Field '" +
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this.field +
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"' doesn't contain a valid alias configuration"
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);
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return callback();
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}
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const data = Object.prototype.hasOwnProperty.call(
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fieldData,
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innerRequest
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)
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? fieldData[innerRequest]
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: innerRequest.startsWith("./")
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? fieldData[innerRequest.slice(2)]
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: undefined;
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if (data === innerRequest) return callback();
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if (data === undefined) return callback();
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if (data === false) {
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/** @type {ResolveRequest} */
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const ignoreObj = {
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...request,
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path: false
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};
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if (typeof resolveContext.yield === "function") {
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resolveContext.yield(ignoreObj);
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return callback(null, null);
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}
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return callback(null, ignoreObj);
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}
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const obj = {
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...request,
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path: request.descriptionFileRoot,
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request: data,
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fullySpecified: false
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};
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resolver.doResolve(
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target,
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obj,
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"aliased from description file " +
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request.descriptionFilePath +
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" with mapping '" +
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innerRequest +
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"' to '" +
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data +
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"'",
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resolveContext,
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(err, result) => {
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if (err) return callback(err);
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// Don't allow other aliasing or raw request
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if (result === undefined) return callback(null, null);
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callback(null, result);
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}
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);
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});
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}
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};
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