[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) › Int64String

```ts
const Int64String: brand(
  "Int64",
  NonEmptyTrimmedString,
  (value) =>
    trySync(
      () => {
        const maybeInt = globalThis.BigInt(value);
        Int64.orThrow(maybeInt);
        return value;
      },
      (): Int64StringError => ({ type: "Int64String", value }),
    ),
);
```

Defined in: [packages/common/src/Type.ts:4084](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Type.ts#L4084)

Stringified [Int64](https://evolu.dev/docs/api-reference/common/Type/variables/Int64).