Class Spinner

packages/angular_devkit/build_angular/src/utils/spinner.ts:13–58

import { isTTY } from './tty';

export class Spinner {
  private readonly spinner: Ora;

  /** When false, only fail messages will be displayed. */
  enabled = true;
  readonly #isTTY = isTTY();

  constructor(text?: string) {
    this.spinner = ora({
      text: text === undefined ? undefined : text + '\n',
      // The below 2 options are needed because otherwise CTRL+C will be delayed
      // when the underlying process is sync.
      hideCursor: false,
      discardStdin: false,
      isEnabled: this.#isTTY,
    });
  }

  set text(text: string) {
    this.spinner.text = text;
  }

  get isSpinning(): boolean {
    return this.spinner.isSpinning || !this.#isTTY;
  }

  succeed(text?: string): void {
    if (this.enabled) {
      this.spinner.succeed(text);
    }
  }

  fail(text?: string): void {
    this.spinner.fail(text && colors.redBright(text));
  }

  stop(): void {
    this.spinner.stop();
  }

  start(text?: string): void {
    if (this.enabled) {
      this.spinner.start(text);
    }
  }
}