102 lines
3.0 KiB
JavaScript
102 lines
3.0 KiB
JavaScript
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/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Ivan Kopeykin @vankop
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*/
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"use strict";
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const forEachBail = require("./forEachBail");
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/** @typedef {import("./Resolver")} Resolver */
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/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
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/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
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/** @typedef {{ alias: string|string[], extension: string }} ExtensionAliasOption */
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module.exports = class ExtensionAliasPlugin {
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/**
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* @param {string | ResolveStepHook} source source
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* @param {ExtensionAliasOption} options options
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* @param {string | ResolveStepHook} target target
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*/
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constructor(source, options, target) {
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this.source = source;
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this.options = options;
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this.target = target;
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}
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/**
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* @param {Resolver} resolver the resolver
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* @returns {void}
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*/
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apply(resolver) {
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const target = resolver.ensureHook(this.target);
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const { extension, alias } = this.options;
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resolver
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.getHook(this.source)
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.tapAsync("ExtensionAliasPlugin", (request, resolveContext, callback) => {
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const requestPath = request.request;
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if (!requestPath || !requestPath.endsWith(extension)) return callback();
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const isAliasString = typeof alias === "string";
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/**
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* @param {string} alias extension alias
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* @param {(err?: null|Error, result?: null|ResolveRequest) => void} callback callback
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* @param {number} [index] index
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* @returns {void}
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*/
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const resolve = (alias, callback, index) => {
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const newRequest = `${requestPath.slice(
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0,
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-extension.length
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)}${alias}`;
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return resolver.doResolve(
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target,
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{
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...request,
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request: newRequest,
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fullySpecified: true
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},
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`aliased from extension alias with mapping '${extension}' to '${alias}'`,
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resolveContext,
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(err, result) => {
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// Throw error if we are on the last alias (for multiple aliases) and it failed, always throw if we are not an array or we have only one alias
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if (!isAliasString && index) {
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if (index !== this.options.alias.length) {
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if (resolveContext.log) {
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resolveContext.log(
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`Failed to alias from extension alias with mapping '${extension}' to '${alias}' for '${newRequest}': ${err}`
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);
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}
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return callback(null, result);
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}
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return callback(err, result);
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} else {
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callback(err, result);
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}
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}
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);
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};
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/**
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* @param {null|Error} [err] error
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* @param {null|ResolveRequest} [result] result
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* @returns {void}
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*/
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const stoppingCallback = (err, result) => {
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if (err) return callback(err);
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if (result) return callback(null, result);
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// Don't allow other aliasing or raw request
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return callback(null, null);
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};
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if (isAliasString) {
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resolve(alias, stoppingCallback);
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} else if (alias.length > 1) {
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forEachBail(alias, resolve, stoppingCallback);
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} else {
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resolve(alias[0], stoppingCallback);
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}
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});
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}
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};
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