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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 !== '.js' && !tsNodeInstance.ignored(nativePath)) {\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"]}
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