Function variant

variant<T extends TSchema>(variantId: number, schema: T): TEnumVariant<T>
Tags a schema with a variant ID for enum serialization.

Variant IDs must be unique within an enum and in range 0-127 (bit 7 clear).
Type Parameters
- T extends TSchema
Parameters
- variantId: number
  Variant identifier (0-127)
- schema: T
  TypeBox or Relish schema for this variant's value
Returns TEnumVariant<T>
Tagged variant schema
Example
```
import { variant, RNull, RString, RU32 } from '@grounds/schema';

const noneVariant = variant(0, RNull());
const textVariant = variant(1, RString());
const countVariant = variant(2, RU32());
```
See
REnum for combining variants into an enum schema