[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [local‑first/Schema](https://evolu.dev/docs/api-reference/common/local-first/Schema) › ValidateSchemaHasId

```ts
type ValidateSchemaHasId<S> = keyof S extends infer TableName
  ? TableName extends keyof S
    ? "id" extends keyof S[TableName]
      ? never
      : SchemaValidationError<`Table "${TableName & string}" is missing required id column.`>
    : never
  : never;
```

Defined in: [packages/common/src/local-first/Schema.ts:293](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/local-first/Schema.ts#L293)