# isEvmSigner · FT4 TypeScript client · Chromia Docs (concept)

> isEvmSigner(signer: Signer ): signer is EvmSigner Type assertion function that checks if the specified signer is an EvmSigner Parameters signer: Signer the

Source: https://docs.chromia.com/pages/ft4-ts-client/functions/authentication.isEvmSigner/

Function

# isEvmSigner

* ```signature
  isEvmSigner(signer: Signer): signer is EvmSigner
  ```

  Type assertion function that checks if the specified signer is an `EvmSigner`

  #### Parameters

  + signer: [Signer](https://docs.chromia.com/pages/ft4-ts-client/types/authentication.Signer/)

    the signer to check

  #### Returns signer is [EvmSigner](https://docs.chromia.com/pages/ft4-ts-client/interfaces/authentication.EvmSigner/)

  true if the specified signer was an `EvmSigner`. Else false.

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-ts-client/functions/authentication.isEvmSigner.html)Generated API reference, mirrored from the live docs