import type { MessageExpressionPart } from '../formatted-parts.ts';
import type { MessageValue } from '../message-value.ts';
import type { MessageFunctionContext } from '../resolve/function-context.ts';
/**
 * The resolved value of a {@link DefaultFunctions.string | :string} expression,
 * or of an expression with a literal operand and no function.
 */
export interface MessageString extends MessageValue<'string'> {
    readonly type: 'string';
    readonly dir: 'ltr' | 'rtl' | 'auto';
    selectKey(keys: Set<string>): string | null;
    toParts(): [MessageStringPart];
    toString(): string;
    valueOf(): string;
}
/**
 * The formatted part for a {@link MessageString} value.
 *
 * @category Formatted Parts
 */
export interface MessageStringPart extends MessageExpressionPart<'string'> {
    type: 'string';
    locale: string;
    value: string;
}
export declare function string(ctx: Pick<MessageFunctionContext, 'dir' | 'locales'>, _options: Record<string, unknown>, operand?: unknown): MessageString;