import type { Control } from '../../Control.js';
import { type NewableOrPrimitive } from '../../matchers/basic/a.js';
declare module '../../expect.js' {
    interface Validators<T> {
        /**
         * Asserts that the value is an instance of a provided class or a primitive
         * type. It is compatible with built-in types like strings, numbers, and
         * dates.
         *
         * If you want to match a nested value, use the matcher `expect.a(type)`
         * instead.
         *
         * @param type - The class or primitive constructor to match against.
         *
         * @example
         * ```ts
         * // Primitives
         * expect(123).toBeA(Number)
         * expect('foo').not.toBeA(Boolean)
         *
         * // Classes
         * expect(new Person('John', 'Doe')).toBeA(Person)
         * ```
         */
        toBeA<C extends NewableOrPrimitive>(type: C): void;
    }
}
export declare function toBeA(control: Control, type: NewableOrPrimitive): void;
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