export declare function isFunction(value: unknown): value is (...args: any[]) => any;
export declare function isNil(value: unknown): value is null | undefined;
export declare function isObject(value: unknown): value is object;
export declare function isArray(value: any): value is any[];
export declare function isBoolean(value: unknown): value is boolean;
export declare function isInteger(value: unknown): value is BigInteger;
export declare function isNumber(value: unknown): value is number;
export declare function isNaN(value: unknown): boolean;
export declare function isString(value: unknown): value is string;
export declare function isSymbol(value: unknown): value is symbol;
export declare function isRegExp(value: unknown): value is RegExp;
export declare const isSet: (value: unknown) => value is Set<unknown>;
export declare const isMap: (value: unknown) => value is Map<unknown, unknown>;
export declare function isEmpty(value: unknown): boolean;
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