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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").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();
}
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) {
/** @type {ResolveRequest} */
const ignoreObj = {
...request,
path: false
};
return callback(null, ignoreObj);
}
const obj = {
...request,
path: request.descriptionFileRoot,
request: data,
fullySpecified: false
};
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);
}
);
});
}
};