[Home](./index.md) > [rc-js-util](./rc-js-util.md) > [\_Production](./rc-js-util._production.md) ## \_Production class Utilities for production builds. **Signature:** ```typescript export declare class _Production ``` ## Methods

Method	Modifiers	Description
[assertValueIsNever(\_value)](./rc-js-util._production.assertvalueisnever.md)	`static`	A function that will error if ever called. The parameter is asserted to be never, useful with switch statements, union types etc.
[createError(message)](./rc-js-util._production.createerror.md)	`static`	Creates an `Error` with the given message. If `_BUILD.DEBUG` is true and `_BUILD.DISABLE_BREAKPOINT_FLAG` is false or unset then a breakpoint will be hit first. Should not be used for "expected" errors (bad input etc).
[error(message)](./rc-js-util._production.error.md)	`static`