/**
 * Line spacing is all-or-nothing: a caller that shows the field owes both the
 * current override and the inherited value it falls back to, so the field can
 * never render an empty box. Elemental has no `line_height` on action nodes, so
 * the button form opts out with `showLineHeight: false` instead.
 */
type LineHeightProps = {
    showLineHeight?: true;
    lineHeight?: number | null;
    inheritedLineHeight: number;
    onLineHeightChange: (value: number | null) => void;
} | {
    showLineHeight: false;
    lineHeight?: never;
    inheritedLineHeight?: never;
    onLineHeightChange?: never;
};
type TypographyFieldsProps = LineHeightProps & {
    /** Current px override, or null when the block inherits. */
    fontSize?: number | null;
    /**
     * What the block renders at while it sets nothing — the document base, then
     * the tier preset. Shown in the field as an editable placeholder, so the
     * author sees the real sizing instead of an empty box.
     */
    inheritedFontSize: number;
    /** Called with null when the field is cleared, i.e. back to inheriting. */
    onFontSizeChange: (value: number | null) => void;
    className?: string;
};
/**
 * Font size / line spacing overrides, in px.
 *
 * The fields are seeded with the value the block already renders at — the
 * document-level base, then the tier preset — and that seed keeps tracking the
 * document base as it changes. Nothing is written to the block until the author
 * types a *different* number, so an untouched block carries no `font_size` /
 * `line_height` of its own. Clearing a field drops the override again.
 *
 * Overrides are per-block and don't stick to the next block of the same kind.
 */
export declare const TypographyFields: ({ fontSize, lineHeight, inheritedFontSize, inheritedLineHeight, onFontSizeChange, onLineHeightChange, showLineHeight, className, }: TypographyFieldsProps) => import("react/jsx-runtime").JSX.Element | null;
export {};