import { Result } from "../result";
import { ConstraintType } from "../type";
export type ValidTypeString = "undefined" | "object" | "boolean" | "number" | "bigint" | "string" | "symbol" | "function";
export declare class TypeOf<T> extends ConstraintType<T> {
    readonly typestring: ValidTypeString;
    constructor(t: ValidTypeString);
    check(val: any): Result<T>;
}
export declare function typeOf<T>(t: ValidTypeString): TypeOf<T>;