/
builtin-named-exports-loader.mjs
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/
builtin-named-exports-loader.mjs
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import module from 'module';
const GET_BUILTIN = `$__get_builtin_hole_${Date.now()}`;
export function getGlobalPreloadCode() {
return `Object.defineProperty(globalThis, ${JSON.stringify(GET_BUILTIN)}, {
value: (builtinName) => {
return getBuiltin(builtinName);
},
enumerable: false,
configurable: false,
});
`;
}
export function resolve(specifier, context, defaultResolve) {
const def = defaultResolve(specifier, context);
if (def.url.startsWith('node:')) {
return {
url: `custom-${def.url}`,
};
}
return def;
}
export function getSource(url, context, defaultGetSource) {
if (url.startsWith('custom-node:')) {
const urlObj = new URL(url);
return {
source: generateBuiltinModule(urlObj.pathname),
format: 'module',
};
}
return defaultGetSource(url, context);
}
export function getFormat(url, context, defaultGetFormat) {
if (url.startsWith('custom-node:')) {
return { format: 'module' };
}
return defaultGetFormat(url, context, defaultGetFormat);
}
function generateBuiltinModule(builtinName) {
const builtinInstance = module._load(builtinName);
const builtinExports = [
...Object.keys(builtinInstance),
];
return `\
const $builtinInstance = ${GET_BUILTIN}(${JSON.stringify(builtinName)});
export const __fromLoader = true;
export default $builtinInstance;
${
builtinExports
.map(name => `export const ${name} = $builtinInstance.${name};`)
.join('\n')
}
`;
}