Method action

src/command.ts:147–150

* Sets the function to be run for the command. * @param fn the function to be run. * @return the command, for chaining.

(fn: ActionFunction)

   * @return the command, for chaining.
   */
  action(fn: ActionFunction): Command {
    this.actionFn = fn;
    return this;
  }

  /**
   * Registers the command with the client. This is used to initially set up