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import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { createRequire } from 'node:module';
// Without an ESM loader, this polyfill is impossible to apply automatically,
// due to the per-module nature of import.meta. In order to use this polyfill,
// you must import it in every module that uses import.meta, and call it with
// the import.meta object as the argument. When the polyfills are integrated
// with bun build, this could be done automatically by the build process at
// the top of every module file bundled.
export default function polyfillImportMeta(metaIn: ImportMeta) {
const require2 = createRequire(metaIn.url);
const metapath = fileURLToPath(metaIn.url);
const meta: ImportMeta = {
url: metaIn.url,
main: metapath === process.argv[1],
path: metapath,
dir: path.dirname(metapath),
file: path.basename(metapath),
require: require2,
async resolve(id: string, parent?: string) {
return this.resolveSync(id, parent);
},
resolveSync(id: string, parent?: string) {
return require2.resolve(id, {
paths: typeof parent === 'string' ? [
path.resolve(parent.startsWith('file://') ? fileURLToPath(parent) : parent, '..')
] : undefined,
});
},
};
Object.assign(metaIn, meta);
}
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