Function getExtendedConfigPathWorker

packages/compiler-cli/src/perform_compile.ts:209–236

(
  configFile: string,
  extendsValue: string,
  host: ConfigurationHost,
  fs: FileSystem,
)

}

function getExtendedConfigPathWorker(
  configFile: string,
  extendsValue: string,
  host: ConfigurationHost,
  fs: FileSystem,
): AbsoluteFsPath | null {
  if (extendsValue.startsWith('.') || fs.isRooted(extendsValue)) {
    const extendedConfigPath = host.resolve(host.dirname(configFile), extendsValue);
    if (host.exists(extendedConfigPath)) {
      return extendedConfigPath;
    }
  } else {
    const parseConfigHost = createParseConfigHost(host, fs);

    // Path isn't a rooted or relative path, resolve like a module.
    const {resolvedModule} = ts.nodeModuleNameResolver(
      extendsValue,
      configFile,
      {moduleResolution: ts.ModuleResolutionKind.NodeNext, resolveJsonModule: true},
      parseConfigHost,
    );
    if (resolvedModule) {
      return absoluteFrom(resolvedModule.resolvedFileName);
    }
  }

  return null;
}

export interface PerformCompilationResult {
  diagnostics: ReadonlyArray<ts.Diagnostic>;