import type { MergeContext } from './mergePipeline.js';
export declare function requireState<TState, K extends keyof TState>(context: MergeContext<TState>, key: K): asserts context is MergeContext<TState & Required<Pick<TState, K>>>;
export declare function requireContextProp<TState, K extends keyof MergeContext<TState>>(context: MergeContext<TState>, key: K): asserts context is MergeContext<TState> & Required<Pick<MergeContext<TState>, K>>;
export declare function requireNonEmptyArray<T>(arr: readonly T[], name?: string): asserts arr is readonly [T, ...T[]];