export interface MessageCatalog {
    required: string;
    minLength: string;
    maxLength: string;
    min: string;
    max: string;
    pattern: string;
    email: string;
    /** currency: more than two decimal places. */
    decimals: string;
    /** number with `integer: true`: a fraction. */
    integer: string;
    dateDisabled: string;
    compareEq: string;
    compareNe: string;
    compareGt: string;
    compareGte: string;
    compareLt: string;
    compareLte: string;
    fileTooLarge: string;
    fileTypeNotAllowed: string;
    fileRejectedTooLarge: string;
    uploading: string;
    uploadFailed: string;
    removeFile: string;
    chooseFile: string;
    chooseFiles: string;
    orDropHere: string;
    uploadMaxSize: string;
    retry: string;
    addRow: string;
    removeRow: string;
    minRows: string;
    maxRows: string;
    /** `min_rows: 1`, where "{n} rows" would read "1 rows". */
    minRowsOne: string;
    /** `max_rows: 1`. */
    maxRowsOne: string;
    maxItems: string;
    ratingRange: string;
    ratingValue: string;
    stepOf: string;
    referenceNotFound: string;
    tagTooLong: string;
    tagNotAllowed: string;
    tagDuplicate: string;
    removeTag: string;
    next: string;
    submit: string;
    back: string;
    step: string;
    approve: string;
    reject: string;
    decision: string;
    comment: string;
    commentRequiredSuffix: string;
    decisionRequired: string;
    commentRequired: string;
    nothingToReview: string;
    /** A `submit` script returned false without adding an error message. */
    scriptBlocked: string;
    yes: string;
    no: string;
    emptyValue: string;
    /** Placeholder option of a dropdown. */
    choose: string;
    rowCount: string;
    results: string;
    columns: string;
    selectAll: string;
    selectRow: string;
    sortBy: string;
    rowActions: string;
    optional: string;
    close: string;
    dismiss: string;
    moreActions: string;
    darkTheme: string;
    opensInNewTab: string;
    otpCharacter: string;
    row: string;
    removeRowN: string;
    stepDone: string;
    stepCurrent: string;
    today: string;
    now: string;
    clear: string;
}
export type MessageKey = keyof MessageCatalog;
export type Locale = 'en' | 'th';
/**
 * Switch every built-in string to a locale, optionally patching single keys:
 *
 *   setLocale('th')                              // all Thai
 *   setLocale('th', { required: 'ห้ามว่าง' })    // Thai + one custom message
 *
 * Global and synchronous — set it before mounting (or before validating on
 * the server). Components read the catalog at render time.
 */
export declare function setLocale(locale: Locale, overrides?: Partial<MessageCatalog>): void;
/**
 * Snapshot of the active catalog. The catalog is module-global — on a server
 * handling concurrent requests with different locales, wrap the locale switch:
 * snapshot, setLocale, do the synchronous work, then setCatalog the snapshot
 * back (bank20baht-validator's `locale` option does exactly this).
 */
export declare function getCatalog(): MessageCatalog;
/** Restore a catalog snapshot taken with getCatalog(). */
export declare function setCatalog(catalog: MessageCatalog): void;
/** Resolve one catalog string, interpolating `{param}` placeholders. */
export declare function t(key: MessageKey, params?: Record<string, unknown>): string;