import type { MessageExpressionPart } from './formatted-parts.ts';
export declare const BIDI_ISOLATE: unique symbol;
/**
 * The base for all resolved message values.
 *
 * @typeParam T - The uniquely identifying `type` of the message value.
 * @typeParam P - The `"type"` used in the formatted-parts representation of the message value.
 */
export interface MessageValue<T extends string, P extends string = T> {
    readonly type: T;
    readonly dir?: 'ltr' | 'rtl' | 'auto';
    readonly options?: Readonly<object>;
    selectKey?: (keys: Set<string>) => string | null;
    toParts?: () => MessageExpressionPart<P>[];
    toString?: () => string;
    valueOf?: () => unknown;
    /** @private */
    [BIDI_ISOLATE]?: boolean;
}