export type { KeysOfUnion } from 'type-fest';
export interface Instance {
    on(type: string, handle: (...args: any[]) => void): void;
    off(type: string, handle: (...args: any[]) => void): void;
    [key: string]: any;
}
export type OptionalId<T> = T extends {
    id: string;
} ? Omit<T, 'id'> & {
    id?: string;
} : T;
export type OptionalSource<T> = T extends {
    source: string;
} ? Omit<T, 'source'> & {
    source?: string;
} : T;