src event.ts

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  interface BehaviorContext {
  props: Record<string, any>;
  state: Record<string, { get: () => unknown; set: (v: unknown) => void }>;
  refs: Record<string, any>;
  prevProps?: Record<string, unknown>;
}
 
interface EventOptions<E> {
  description?: string;
  handler?: (event: E, context: BehaviorContext) => void | boolean;
}
 
interface EventDef<E> {
  __type: 'event';
  options: EventOptions<E>;
}
 
export function event<E>(options: EventOptions<E>): EventDef<E> {
  return {
    __type: 'event',
    options,
  };
}