import type { FormValue } from "./value.js";
/**
 * A boolean form value.
 */
export interface FormBoolean<TOptional extends boolean = false> extends FormValue {
    type: "boolean";
    /**
     * Whether this boolean is optional, i.e. allows `undefined` values.
     */
    isOptional: TOptional;
    /**
     * Make this boolean optional, i.e. allow `undefined` values.
     */
    optional(): FormBoolean<true>;
}
/**
 * Create a new boolean form value.
 */
export declare function boolean(): FormBoolean<false>;
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