export declare class Checks {
    /**
     * Verifies that a boolean condition is met or throws an Error if it is not.
     *
     * @param checkResult Determines the outcome of the check via it's truthyness.
     * @param subjectOfCheck The error message if `checkResult` is falsy.
     * @param code The code of the error if `checkResult is falsy.
     */
    static truthy(checkResult: unknown, subjectOfCheck?: string, code?: string): void;
    /**
     * Verifies that a string is indeed not a blank string.
     * Blank string can be one that only has whitespace characters for example.
     *
     * @param value The value that will be asserted for being a non-blank string.
     * @param subject The error message if `value` is a blank string.
     * @param code The code of the error if `checkResult is falsy.
     */
    static nonBlankString(value: unknown, subject?: string, code?: string): void;
}