isPermanent

Returns true if an error is a permanent failure instead of a temporary one (broken network, 500, rate limit etc.)

A permanent error is an error returned by Stream's API (IE a validation error on the input) Any permanent error will always have a stream error code

Temporary errors are retried. Network not being available is a common example of a temporary error.

See the error codes here https://getstream.io/chat/docs/api_errors_response/?language=js