export declare function hasProp<K extends PropertyKey>(data: unknown, prop: K): data is Record<K, unknown>;
export declare const isDefined: <T>(val: T | undefined) => val is T;
export declare const notNull: <T>(val: T | null) => val is T;
export declare const isJust: <T>(val: T | null) => val is T;
export declare const isValue: <T>(val: T | null | undefined) => val is T;
export declare const isBool: (val: unknown) => val is boolean;
export declare function isCryptoKey(val: unknown): val is CryptoKey;
export declare const isNum: (val: unknown) => val is number;
export declare const isString: (val: unknown) => val is string;
export declare const isObject: <T>(val: unknown) => val is Record<string, T>;
export declare const isBlob: (val: unknown) => val is Blob;