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We should always see `null` or `''`\n    if (hostname) {\n      // TODO file://./foo sets `hostname` to `'.'`.  Perhaps we should special-case this.\n      return defer()\n    }\n\n    // pathname is the path to be resolved\n\n    return nodeResolveImplementation.defaultResolve(specifier, context, defaultResolve)\n  }\n\n  type Format = 'builtin'\t| 'commonjs' | 'dynamic' | 'json' | 'module' | 'wasm'\n  async function getFormat (url: string, context: {}, defaultGetFormat: typeof getFormat): Promise<{format: Format}> {\n    const defer = (overrideUrl: string = url) => defaultGetFormat(overrideUrl, context, defaultGetFormat)\n\n    const parsed = parseUrl(url)\n\n    if (!isFileUrlOrNodeStyleSpecifier(parsed)) {\n      return defer()\n    }\n\n    const { pathname } = parsed\n    assert(pathname !== null, 'ESM getFormat() hook: URL should never have null pathname')\n\n    const nativePath = fileURLToPath(url)\n\n    // If file has .ts, .tsx, or .jsx extension, then ask node how it would treat this file if it were .js\n    const ext = extname(nativePath)\n    if (ext === '.ts' || ext === '.tsx' || ext === '.jsx') {\n      return defer(formatUrl(pathToFileURL(nativePath + '.js')))\n    }\n\n    return defer()\n  }\n\n  async function transformSource (source: string | Buffer, context: {url: string, format: Format}, defaultTransformSource: typeof transformSource): Promise<{source: string | Buffer}> {\n    const defer = () => defaultTransformSource(source, context, defaultTransformSource)\n\n    const sourceAsString = typeof source === 'string' ? source : source.toString('utf8')\n\n    const { url } = context\n    const parsed = parseUrl(url)\n\n    if (!isFileUrlOrNodeStyleSpecifier(parsed)) {\n      return defer()\n    }\n    const nativePath = fileURLToPath(url)\n\n    if (tsNodeInstance.ignored(nativePath)) {\n      return defer()\n    }\n\n    const emittedJs = tsNodeInstance.compile(sourceAsString, nativePath)\n\n    return { source: emittedJs }\n  }\n}\n"]}