# StringKey

Fields, allowed values, and APIs that use StringKey.

Canonical: https://grid.syidax.com/docs/types/StringKey/

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## Type definition

A question mark (?) marks an optional field; readonly marks a value you should not change directly. A union (|) accepts one of the listed forms. Functions are callbacks that Grid invokes at the relevant point.

```typescript
type StringKey<T> = Extract<keyof T, string>;
```

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## Contracts containing this type

- [GridFieldPath](https://grid.syidax.com/docs/types/GridFieldPath.md)
- [GridFieldPathLevel2](https://grid.syidax.com/docs/types/GridFieldPathLevel2.md)