[Home](./index.md) > [@contract-case/case-boundary](./case-boundary.md) > [BoundaryStateHandler](./case-boundary.boundarystatehandler.md) > [teardown](./case-boundary.boundarystatehandler.teardown.md) ## BoundaryStateHandler.teardown() method Call the user's state teardown function If the user provided no teardown function, this should be a function that does nothing and returns a `BoundarySuccess` **Signature:** ```typescript teardown(): Promise; ``` **Returns:** Promise<[BoundaryResult](./case-boundary.boundaryresult.md)> Either a `BoundaryFailure` with `kind=BoundaryFailureKindConstants.CASE_CONFIGURATION_ERROR` or a `BoundarySuccess`