/** The document-level style properties as they appear on an email channel node. */
export interface EmailChannelDocumentStyles {
    padding?: string;
    font_size?: string;
    line_height?: string;
}
/**
 * Resolve an email channel node's document-level styles into what the canvas
 * needs: the Frame's vertical/horizontal inset and the CSS variables that carry
 * the base font size and line height.
 *
 * Pure, so a read-only surface that renders a *stored* version of a template
 * (the version-comparison panes) resolves them exactly the way the live editor
 * does, instead of duplicating the cascade or silently falling back to presets.
 * {@link useEmailDocumentStyles} derives the same values for the live editor.
 */
export declare function resolveEmailDocumentStyles(channel: EmailChannelDocumentStyles | undefined | null): {
    emailPaddingVertical: number;
    emailPaddingHorizontal: number;
    emailFontSize: number | null;
    emailLineHeight: number | null;
    documentStyleVars: Record<string, string>;
};
interface UseEmailDocumentStylesOptions {
    isTemplateTransitioning?: boolean;
}
/**
 * Reads and writes the document-level email styles — body `padding`, base
 * `font_size` and base `line_height` — on the `channel: "email"` node.
 *
 * Mirrors {@link useEmailBackgroundColors}, with one deliberate difference: the
 * properties are never back-filled with defaults. An unset property means "use
 * the renderer's default", and writing one out would freeze today's default into
 * every template. The Frame/Text controls seed their inputs from the same
 * defaults instead, and `reset*` removes the property again.
 */
export declare function useEmailDocumentStyles(options?: UseEmailDocumentStylesOptions): {
    emailPaddingVertical: number;
    emailPaddingHorizontal: number;
    hasPaddingOverride: boolean;
    handlePaddingChange: (next: {
        vertical?: number;
        horizontal?: number;
    }) => void;
    resetPadding: () => void;
    emailFontSize: number | null;
    handleFontSizeChange: (value: number | null) => void;
    emailLineHeight: number | null;
    handleLineHeightChange: (value: number | null) => void;
    /**
     * What the Text inputs show — the renderer's base metrics when the property
     * is unset, mirroring how the Frame inputs fall back.
     *
     * Kept separate from `emailFontSize` / `emailLineHeight`, which stay `null`
     * when unset: that null is load-bearing. It drives `hasTypographyOverride`
     * (so "Reset to default" only appears once something is actually set), it
     * keeps `documentStyleVars` from pinning a value the author never chose, and
     * the text, list and quote blocks read `emailLineHeightAtom` directly to
     * decide whether a document base applies at all.
     */
    emailFontSizeValue: number;
    emailLineHeightValue: number;
    hasTypographyOverride: boolean;
    resetTypography: () => void;
    documentStyleVars: Record<string, string>;
};
export {};