export declare function isString(any: unknown): any is string;
export declare function isBoolean(any: unknown): any is boolean;
export declare function isNumber(any: unknown): any is number;
export declare function isArray(any: unknown): any is unknown[];
export declare function isVarName(varName: string): boolean;
export declare function isUndefined(any: unknown): any is undefined;
export declare function isNever(never: never): void;