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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const forEachBail = require("./forEachBail");
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
/** @typedef {{alias: string|Array<string>|false, name: string, onlyModule?: boolean}} AliasOption */
module.exports = class AliasPlugin {
/**
* @param {string | ResolveStepHook} source source
* @param {AliasOption | Array<AliasOption>} options options
* @param {string | ResolveStepHook} target target
*/
constructor(source, options, target) {
this.source = source;
this.options = Array.isArray(options) ? options : [options];
this.target = target;
}
/**
* @param {Resolver} resolver the resolver
* @returns {void}
*/
apply(resolver) {
const target = resolver.ensureHook(this.target);
resolver
.getHook(this.source)
.tapAsync("AliasPlugin", (request, resolveContext, callback) => {
const innerRequest = request.request || request.path;
if (!innerRequest) return callback();
forEachBail(
this.options,
(item, callback) => {
let shouldStop = false;
if (
innerRequest === item.name ||
(!item.onlyModule && innerRequest.startsWith(item.name + "/"))
) {
const remainingRequest = innerRequest.substr(item.name.length);
const resolveWithAlias = (alias, callback) => {
if (alias === false) {
const ignoreObj = {
...request,
path: false
};
return callback(null, ignoreObj);
}
if (
innerRequest !== alias &&
!innerRequest.startsWith(alias + "/")
) {
shouldStop = true;
const newRequestStr = alias + remainingRequest;
const obj = {
...request,
request: newRequestStr,
fullySpecified: false
};
return resolver.doResolve(
target,
obj,
"aliased with mapping '" +
item.name +
"': '" +
alias +
"' to '" +
newRequestStr +
"'",
resolveContext,
(err, result) => {
if (err) return callback(err);
if (result) return callback(null, result);
return callback();
}
);
}
return callback();
};
const stoppingCallback = (err, result) => {
if (err) return callback(err);
if (result) return callback(null, result);
// Don't allow other aliasing or raw request
if (shouldStop) return callback(null, null);
return callback();
};
if (Array.isArray(item.alias)) {
return forEachBail(
item.alias,
resolveWithAlias,
stoppingCallback
);
} else {
return resolveWithAlias(item.alias, stoppingCallback);
}
}
return callback();
},
callback
);
});
}
};