[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Type](https://evolu.dev/docs/api-reference/common/Type) › TransformError

```ts
type TransformError<Name, OwnError, OutputError> =
  OwnError | [OutputError] extends [never]
  ? never
  : TransformOutputError<Name, OutputError>;
```

Defined in: [packages/common/src/Type.ts:2490](https://github.com/evoluhq/evolu/blob/f0109fb501a593010e858e39248dde1200eeb2d7/packages/common/src/Type.ts#L2490)

An error produced by [transform](https://evolu.dev/docs/api-reference/common/Type/functions/transform) while decoding or validating its
output.