/** Known symbol assets are not text typefaces; unknown families stay eligible. */
export declare function isKnownSymbolFontFamily(family: string): boolean;
/** Words a family name carries for packaging rather than design: "Inter Display", "Avenir Web". */
export declare const FONT_DESCRIPTOR_WORDS: Set<string>;
/** Weight and style words a family name can carry: "Avenir Book", "Graphik Semibold". */
export declare const FONT_VARIANT_WORDS: Set<string>;
export declare const FONT_STYLE_WORDS: Set<string>;
export declare function stripCssQuotes(value: string): string;
/** "InterDisplay-Bold", "'Inter Display'" → "inter display bold", "inter display": camel case split, punctuation to spaces, lower case. */
export declare function normalizeFontFamilyName(value: string): string;
/** The key two family names share when they are the same typeface: Brand Studio's alias minus weight, style and packaging words ("Avenir Book" → "avenir"), stricter than the first-word alias. */
export declare function fontFamilyKey(family: string): string;
export declare function getTypographyFonts<FontType extends {
    family: string;
    faces: {
        cssFamily: string;
    }[];
}>(fonts: FontType[]): FontType[];
/**
 * Slugified family name, matching how `fontNameToCssVariable` derives a CSS var
 * (e.g. "DM Sans" → "dm-sans"), so a `--font-<slug>` var round-trips back to a
 * catalog family.
 */
export declare function slugifyFontFamily(family: string): string;
/**
 * "DM Sans" → "--font-dm-sans". The CSS variable a `next/font` import exposes.
 */
export declare function fontNameToCssVariable(fontName: string): string;
/**
 * Wrap a family in single quotes for `font-family` when it contains whitespace
 * (e.g. `Open Sans` → `'Open Sans'`); single-word families pass through.
 */
export declare function quoteFontFamily(family: string): string;
/**
 * "DM Sans" → "dmSans". The JS const name for a `next/font` declaration.
 */
export declare function fontNameToVariableName(fontName: string): string;
/**
 * Google Fonts CSS2 stylesheet URL for a family at the given weights (defaulting
 * to 400), with `display=swap`.
 */
export declare function buildGoogleFontsCssUrl(family: string, weights?: number[]): string;
/**
 * "Brand Sans-Bold.woff2" → { family: "Brand Sans Bold", mimeType: "font/woff2" }.
 * The family is derived from the filename since Bedrock assets don't store one.
 */
export declare function describeFontFile(fileName: string): {
    family: string;
    mimeType: string;
};
/**
 * The `format(...)` keyword for an @font-face src, from a font file extension
 * (Bedrock's `find` returns `fileExtension`, not a MIME type).
 */
export declare function fontFormatFromExtension(extension: string): string;
/** The `format(...)` keyword for an @font-face src, from a font MIME type. */
export declare function fontFormatFromMimeType(mimeType: string): string;
/**
 * The @font-face rule that makes a custom family renderable from its asset URL.
 */
export declare function buildFontFaceCss({ family, faceUrl, format, weight, style, }: {
    family: string;
    faceUrl: string;
    format: string;
    weight?: number;
    style?: "normal" | "italic";
}): string;
export declare const escapeFontFamilyName: (fontFamily: string) => string;