mirror of https://github.com/nodejs/node.git
60 lines
1.4 KiB
JavaScript
60 lines
1.4 KiB
JavaScript
import module from 'node:module';
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import { readFileSync } from 'node:fs';
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/** @type {string} */
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let GET_BUILTIN;
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export function initialize(data) {
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GET_BUILTIN = data.GET_BUILTIN;
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}
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export async function resolve(specifier, context, next) {
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const def = await next(specifier, context);
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if (def.url.startsWith('node:')) {
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return {
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shortCircuit: true,
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url: `custom-${def.url}`,
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importAttributes: context.importAttributes,
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};
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}
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return def;
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}
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export function load(url, context, next) {
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if (url.startsWith('custom-node:')) {
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const urlObj = new URL(url);
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return {
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shortCircuit: true,
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source: generateBuiltinModule(urlObj.pathname),
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format: 'commonjs',
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};
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} else if (context.format === undefined || context.format === null || context.format === 'commonjs') {
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return {
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shortCircuit: true,
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source: readFileSync(new URL(url)),
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format: 'commonjs',
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};
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}
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return next(url);
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}
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function generateBuiltinModule(builtinName) {
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const builtinInstance = module._load(builtinName);
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const builtinExports = [
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...Object.keys(builtinInstance),
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];
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return `\
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const $builtinInstance = ${GET_BUILTIN}(${JSON.stringify(builtinName)});
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module.exports = $builtinInstance;
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module.exports.__fromLoader = true;
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// We need this for CJS-module-lexer can parse the exported names.
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${
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builtinExports
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.map(name => `exports.${name} = $builtinInstance.${name};`)
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.join('\n')
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}
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`;
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}
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