优化

‘liusuyi’

2023-10-21 ae92b6823499cfab77201b4033922fa373fb37a3

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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");
 
module.exports = class AliasFieldPlugin {
    constructor(source, field, target) {
        this.source = source;
        this.field = field;
        this.target = target;
    }
 
    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 (typeof fieldData !== "object") {
                    if (resolveContext.log)
                        resolveContext.log(
                            "Field '" +
                                this.field +
                                "' doesn't contain a valid alias configuration"
                        );
                    return callback();
                }
                const data1 = fieldData[innerRequest];
                const data2 = fieldData[innerRequest.replace(/^\.\//, "")];
                const data = typeof data1 !== "undefined" ? data1 : data2;
                if (data === innerRequest) return callback();
                if (data === undefined) return callback();
                if (data === false) {
                    const ignoreObj = Object.assign({}, request, {
                        path: false
                    });
                    return callback(null, ignoreObj);
                }
                const obj = Object.assign({}, request, {
                    path: request.descriptionFileRoot,
                    request: data
                });
                resolver.doResolve(
                    target,
                    obj,
                    "aliased from description file " +
                        request.descriptionFilePath +
                        " with mapping '" +
                        innerRequest +
                        "' to '" +
                        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);
                    }
                );
            });
    }
};