Method assertOpen

lib/terminal.ts:1221–1228

* Assert terminal is open (throw if not)

()

   * Assert terminal is open (throw if not)
   */
  private assertOpen(): void {
    if (this.isDisposed) {
      throw new Error('Terminal has been disposed');
    }
    if (!this.isOpen) {
      throw new Error('Terminal must be opened before use. Call terminal.open(parent) first.');
    }
  }

  /**
   * Handle mouse move for link hover detection and scrollbar dragging