import { type ImmutableArray } from "../util/array.js";
import type { SchemaOptions } from "./Schema.js";
import { Schema } from "./Schema.js";
export type ChoiceOptions<K extends string> = ImmutableArray<K> | {
    readonly [KK in K]: unknown;
};
export type ChoiceOption<K extends string> = readonly [K, unknown];
/** Get the options for a choice field as an array. */
export declare function getChoiceEntries<K extends string>(options: ChoiceOptions<K>): ImmutableArray<ChoiceOption<K>>;
/** Get the keys for a choice field as an array. */
export declare function getChoiceKeys<K extends string>(options: ChoiceOptions<K>): ImmutableArray<K>;
/** Get the options for a choice field as an array. */
export declare function isOption<K extends string>(options: ChoiceOptions<K>, option: string): option is K;
/** Allowed options for `ChoiceSchema` */
export interface ChoiceSchemaOptions<K extends string> extends Omit<SchemaOptions, "value"> {
    /** Specify correct options using a dictionary of entries. */
    readonly options: ChoiceOptions<K>;
    /** Default option for the value. */
    readonly value?: K;
}
/** Choose from an allowed set of values. */
export declare class ChoiceSchema<K extends string> extends Schema<K> implements Iterable<ChoiceOption<K>> {
    readonly value: K;
    readonly options: ChoiceOptions<K>;
    constructor({ one, title, placeholder, options, value, ...rest }: ChoiceSchemaOptions<K>);
    validate(unsafeValue?: unknown): K;
    [Symbol.iterator](): Iterator<ChoiceOption<K>>;
    keys(): ImmutableArray<K>;
    entries(): ImmutableArray<ChoiceOption<K>>;
}
/** Choose from an allowed set of values. */
export declare function CHOICE<K extends string>(options: ChoiceOptions<K>): ChoiceSchema<K>;