interfaceassert.default.AssertionErrorOptionsinterface AssertionErrorOptionsactual?: unknownThe actual property on the error instance.diff?: 'simple' | 'full'If set to 'full', shows the full diff in assertion errors.expected?: unknownThe expected property on the error instance.message?: stringIf provided, the error message is set to this value.operator?: stringThe operator property on the error instance.stackStartFn?: FunctionIf provided, the generated stack trace omits frames before this function.