Function definePrimitive

definePrimitive<TArgs extends JsonValue, const TReads extends keyof ContextMap>(
primitive: RulePrimitive<TArgs, TReads>,
): RulePrimitive<TArgs, TReads>
Alpha
Identity helper for declaring a primitive. Returns its argument unchanged.

The helper exists so TypeScript can infer TArgs from the annotation on build's parameter, and TReads from the reads tuple. Without it, the args shape must either be repeated as a variable type annotation, or TArgs falls back to its unknown default, discarding the args type at every downstream call site.

Does not validate the id namespace, that check happens at runtime inside RuleRegistry.register.
Type Parameters
- TArgs extends JsonValue
- const TReads extends keyof ContextMap
Parameters
- primitive: RulePrimitive<TArgs, TReads>
  The primitive definition.
Returns RulePrimitive<TArgs, TReads>
The same primitive, unchanged.
Example
The args shape lives only on build's parameter. TypeScript infers TArgs = OlderThanArgs and TReads = 'limeobject', so scope.get('user') inside build would be a compile error.
```
type OlderThanArgs = { days: number };

const olderThan = definePrimitive({
    id: 'limetech.older-than',
    reads: ['limeobject'],
    build: ({ days }: OlderThanArgs) => (scope) =>
        scope.get('limeobject') !== undefined && days > 0,
});
```