Class NullTree

packages/angular_devkit/schematics/src/tree/null.ts:58–122

// eslint-disable-next-line @typescript-eslint/no-unsafe-declaration-merging
export class NullTree implements Tree {
  constructor() {
    this[TreeSymbol] = () => this;
  }

  branch(): Tree {
    return new NullTree();
  }
  merge(_other: Tree, _strategy?: MergeStrategy): void {}

  readonly root: DirEntry = new NullTreeDirEntry(normalize('/'));

  // Simple readonly file system operations.
  exists(_path: string) {
    return false;
  }
  read(_path: string) {
    return null;
  }
  readText(path: string): string {
    throw new FileDoesNotExistException(path);
  }
  readJson(path: string): JsonValue {
    throw new FileDoesNotExistException(path);
  }
  get(_path: string) {
    return null;
  }
  getDir(path: string): NullTreeDirEntry {
    return new NullTreeDirEntry(normalize('/' + path));
  }
  visit(): void {}

  // Change content of host files.
  beginUpdate(path: string): never {
    throw new FileDoesNotExistException(path);
  }
  commitUpdate(record: UpdateRecorder): never {
    throw new FileDoesNotExistException(
      record instanceof UpdateRecorderBase ? record.path : '<unknown>',
    );
  }

  // Change structure of the host.
  copy(path: string, _to: string): never {
    throw new FileDoesNotExistException(path);
  }
  delete(path: string): never {
    throw new FileDoesNotExistException(path);
  }
  create(path: string, _content: Buffer | string): never {
    throw new CannotCreateFileException(path);
  }
  rename(path: string, _to: string): never {
    throw new FileDoesNotExistException(path);
  }
  overwrite(path: string, _content: Buffer | string): never {
    throw new FileDoesNotExistException(path);