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experimentalLoader.ts
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experimentalLoader.ts
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/**
* Copyright (c) Microsoft Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import fs from 'fs';
import url from 'url';
import { transformHook, resolveHook } from './transform';
// Node < 18.6: defaultResolve takes 3 arguments.
// Node >= 18.6: nextResolve from the chain takes 2 arguments.
async function resolve(specifier: string, context: { parentURL?: string }, defaultResolve: Function) {
if (context.parentURL && context.parentURL.startsWith('file://')) {
const filename = url.fileURLToPath(context.parentURL);
const resolved = resolveHook(filename, specifier);
if (resolved !== undefined)
specifier = url.pathToFileURL(resolved).toString();
}
return defaultResolve(specifier, context, defaultResolve);
}
// Node < 18.6: defaultLoad takes 3 arguments.
// Node >= 18.6: nextLoad from the chain takes 2 arguments.
async function load(moduleUrl: string, context: any, defaultLoad: Function) {
if (moduleUrl.startsWith('file://') && (moduleUrl.endsWith('.ts') || moduleUrl.endsWith('.tsx'))) {
const filename = url.fileURLToPath(moduleUrl);
const code = fs.readFileSync(filename, 'utf-8');
const source = transformHook(code, filename, moduleUrl);
// shortCurcuit is required by Node >= 18.6 to designate no more loaders should be called.
return { format: 'module', source, shortCircuit: true };
}
return defaultLoad(moduleUrl, context, defaultLoad);
}
module.exports = { resolve, load };