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