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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);
}
);
});
}
};