> For the complete documentation index, see [llms.txt](https://error.angular-package.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://error.angular-package.dev/error/methods.md).
# Methods
| |
| ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| public static define(): Error<Id>
Defines the Error instance with the message built of the given required problem, fix and optional id on the template.
|
| public static isError(): value is Error<Id>
Checks whether the value of any type is an instance of Error of any or the given identification.
|