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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Ivan Kopeykin @vankop
*/
"use strict";
const forEachBail = require("./forEachBail");
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
/** @typedef {{ alias: string|string[], extension: string }} ExtensionAliasOption */
module.exports = class ExtensionAliasPlugin {
/**
* @param {string | ResolveStepHook} source source
* @param {ExtensionAliasOption} options options
* @param {string | ResolveStepHook} target target
*/
constructor(source, options, target) {
this.source = source;
this.options = options;
this.target = target;
}
/**
* @param {Resolver} resolver the resolver
* @returns {void}
*/
apply(resolver) {
const target = resolver.ensureHook(this.target);
const { extension, alias } = this.options;
resolver
.getHook(this.source)
.tapAsync("ExtensionAliasPlugin", (request, resolveContext, callback) => {
const requestPath = request.request;
if (!requestPath || !requestPath.endsWith(extension)) return callback();
const resolve = (alias, callback) => {
resolver.doResolve(
target,
{
...request,
request: `${requestPath.slice(0, -extension.length)}${alias}`,
fullySpecified: true
},
`aliased from extension alias with mapping '${extension}' to '${alias}'`,
resolveContext,
callback
);
};
const stoppingCallback = (err, result) => {
if (err) return callback(err);
if (result) return callback(null, result);
// Don't allow other aliasing or raw request
return callback(null, null);
};
if (typeof alias === "string") {
resolve(alias, stoppingCallback);
} else if (alias.length > 1) {
forEachBail(alias, resolve, stoppingCallback);
} else {
resolve(alias[0], stoppingCallback);
}
});
}
};