type PathValue<T, TPath extends readonly PropertyKey[]> = TPath extends [] ? Exclude<T, undefined> : TPath extends [infer THead, ...infer TTail] ? THead extends keyof Exclude<T, undefined> ? PathValue<Exclude<T, undefined>[THead], Extract<TTail, readonly PropertyKey[]>> : never : never;
/**
 * Ensures that a value, or a nested value selected by path, is not `undefined`.
 *
 * @param value - Root value that must be defined.
 * @param path - Property path resolved from `value`.
 * @returns The resolved value narrowed to exclude `undefined`.
 * @throws When the resolved value is `undefined`.
 */
export declare function ensureDefined<T>(value: T): Exclude<T, undefined>;
export declare function ensureDefined<T, const TPath extends readonly [PropertyKey, ...PropertyKey[]]>(value: T, ...path: TPath): PathValue<T, TPath>;
export {};
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