import { LiteralBase, Spec } from './types.js';
/**
 * Creates a literal validator spec. When `literal(undefined)` is used as a property validator
 * inside `object` or `struct` and that property is not present in the validated object
 * the validation will fail.
 *
 * @param value Literal value: constant string, number, boolean, null or undefined value
 */
export declare const literal: <Literal extends LiteralBase>(value: Literal) => Spec<[
    Literal extends string ? 'string-literal' : 'non-string-literal'
], 'validator', Literal>;