Function log

packages/core/src/actions/log.ts:73–102

(
  value: ResolvableLogValue<TContext, TExpressionEvent, TParams, TEvent> = ({
    context,
    event
  }) => ({ context, event }),
  label?: string
)

 * @param label The label to give to the logged expression.
 */
export function log<
  TContext extends MachineContext,
  TExpressionEvent extends EventObject,
  TParams extends ParameterizedObject['params'] | undefined,
  TEvent extends EventObject
>(
  value: ResolvableLogValue<TContext, TExpressionEvent, TParams, TEvent> = ({
    context,
    event
  }) => ({ context, event }),
  label?: string
): LogAction<TContext, TExpressionEvent, TParams, TEvent> {
  function log(
    _args: ActionArgs<TContext, TExpressionEvent, TEvent>,
    _params: TParams
  ) {
    if (isDevelopment) {
      throw new Error(`This isn't supposed to be called`);
    }
  }

  log.type = 'xstate.log';
  log.value = value;
  log.label = label;

  log.resolve = resolveLog;
  log.execute = executeLog;

  return log;
}