import { type Color } from './colors';
/** Underline styles per openpyxl's NestedNoneSet. */
export type UnderlineStyle = 'single' | 'double' | 'singleAccounting' | 'doubleAccounting';
export declare const UNDERLINE_STYLES: ReadonlyArray<UnderlineStyle>;
export type VertAlign = 'baseline' | 'superscript' | 'subscript';
export declare const VERT_ALIGNS: ReadonlyArray<VertAlign>;
export type FontScheme = 'major' | 'minor';
export declare const FONT_SCHEMES: ReadonlyArray<FontScheme>;
export interface Font {
    readonly name?: string;
    readonly charset?: number;
    /** Font family code (0..14). */
    readonly family?: number;
    /** Point size; openpyxl name = `sz`. */
    readonly size?: number;
    readonly color?: Color;
    readonly bold?: boolean;
    readonly italic?: boolean;
    readonly strike?: boolean;
    readonly outline?: boolean;
    readonly shadow?: boolean;
    readonly condense?: boolean;
    readonly extend?: boolean;
    readonly underline?: UnderlineStyle;
    readonly vertAlign?: VertAlign;
    readonly scheme?: FontScheme;
}
export declare function makeFont(opts?: Partial<Font>): Font;
/** Excel's default cell font: Calibri 11, minor scheme, theme=1 colour. */
export declare const DEFAULT_FONT: Font;
/**
 * Translate a {@link Font} to a CSS-property record suitable for HTML
 * rendering / preview. Boolean toggles map to weight/style/decoration,
 * `size` becomes `font-size: <n>pt`, and an explicit rgb/indexed
 * `color` is rendered as `#RRGGBB` (alpha dropped). theme/auto colours
 * are skipped — callers without a theme can't resolve them.
 *
 * `vertAlign='superscript'|'subscript'` lowers `font-size` to 0.83em
 * (W3C convention) and sets `vertical-align`.
 *
 * Returns `{}` for an empty Font so callers can spread it without
 * overwriting upstream defaults.
 */
export declare function fontToCss(font: Font | undefined): Record<string, string>;