Method start

cli/unstable_spinner.ts:217–243

* Starts the spinner. * * @example Usage * ```ts ignore * import { Spinner } from "@std/cli/unstable-spinner"; * * const spinner = new Spinner({ message: "Loading..." }); * spinner.start(); * ```

()

   * ```
   */
  start() {
    if (this.#intervalId !== null || this.#output.writable.locked) {
      return;
    }

    let i = 0;
    const noColor = Deno.noColor;

    // Updates the spinner after the given interval.
    const updateFrame = () => {
      const color = this.#color ?? "";
      const frame = encoder.encode(
        noColor
          ? this.#spinner[i] + " " + this.message
          : color + this.#spinner[i] + COLOR_RESET + " " + this.message,
      );
      // call writeSync once to reduce flickering
      const writeData = new Uint8Array(LINE_CLEAR.length + frame.length);
      writeData.set(LINE_CLEAR);
      writeData.set(frame, LINE_CLEAR.length);
      this.#output.writeSync(writeData);
      i = (i + 1) % this.#spinner.length;
    };

    this.#intervalId = setInterval(updateFrame, this.#interval);
    updateFrame();
  }

  /**
   * Stops the spinner.