/**
 * Dependency-free input masking — replaces `@react-input/mask` for the two masks this library
 * actually uses: the date scaffold `'  /  /    '` (showMask) and the progressive time mask
 * `'xx:xx'`. Slots (positions equal to `maskChar`) accept digits; every other mask character is a
 * literal.
 */
export interface InputMaskSpec {
    /** Mask template, e.g. `'  /  /    '` or `'xx:xx'`. */
    mask: string;
    /** The character in `mask` marking a fillable slot, e.g. `' '` or `'x'`. */
    maskChar: string;
    /** true → render the full scaffold once any digit is present; false → grow as the user types. */
    showMask: boolean;
}
export interface MaskedResult {
    value: string;
    caret: number;
}
/** Date picker mask — shared by `useDatePickerMask` and display formatting. */
export declare const DATE_INPUT_MASK: InputMaskSpec;
/**
 * Font family the editable date input MUST render in. `DATE_INPUT_MASK` is a *space scaffold*
 * (its `maskChar` is `' '`), so the field relies on a fixed-width font: with a proportional font
 * (e.g. Roboto) the empty day/year space slots collapse to hairlines and the mask visibly loses
 * its spaces (a real regression once shipped). A monospace font keeps every slot the same width so
 * the `dd / mm / yyyy` columns stay aligned. This is coupled to the space `maskChar` — the two are
 * asserted together in `inputMask.test.ts`; do not switch this to a proportional font.
 */
export declare const DATE_INPUT_FONT_FAMILY = "monospace";
/**
 * Pure formatter: distributes the digits of `raw` over the mask slots and computes the caret
 * position that follows the last digit typed before `caretInRaw`. Zero digits yield an empty value
 * so the date field can show its scaffold as a placeholder only while focused.
 */
export declare const formatMaskedValue: (raw: string, caretInRaw: number, spec: InputMaskSpec) => MaskedResult;
/**
 * Ref-callback hook applying `formatMaskedValue` on every native `input` event, before React's
 * delegated onChange reads the value — a drop-in for `useMask` from `@react-input/mask`.
 */
export declare const useInputMask: ({ mask, maskChar, showMask }: InputMaskSpec) => ((element: HTMLInputElement | null) => void);