--- /dev/null
+export declare function boolean(value: any): value is boolean;
+export declare function string(value: any): value is string;
+export declare function number(value: any): value is number;
+export declare function error(value: any): value is Error;
+export declare function func(value: any): value is Function;
+export declare function array<T>(value: any): value is T[];
+export declare function stringArray(value: any): value is string[];
+export declare function typedArray<T>(value: any, check: (value: any) => boolean): value is T[];
+export declare function thenable<T>(value: any): value is Thenable<T>;