export declare function escapeCssStringContent(value: string, quote: "'" | '"'): string;
export declare function stringifyFontFamily(name: string): string;
export declare function maybeCssQuote(value: string): string;
interface CssFontFaceRelation {
    format?: string;
    to: {
        type?: string;
        url: string;
    };
}
export declare function getPreferredFontUrl(cssFontFaceSrcRelations?: CssFontFaceRelation[]): string | undefined;
interface RelationWithHrefType {
    hrefType?: string;
}
interface PostCssToString {
    toString(): string;
}
export declare function getFontFaceDeclarationText(node: PostCssToString, relations: RelationWithHrefType[]): string;
interface FontUsageLike {
    subsets?: Record<string, Buffer>;
    props: Record<string, string | number>;
    codepoints?: {
        used: number[];
        original: number[];
    };
    fontFamilies: Set<string>;
}
export declare function getFontFaceForFontUsage(fontUsage: FontUsageLike): string;
interface UnusedDeclaration {
    src?: string;
    relations: Array<{
        to: {
            url: string;
        };
        tokenRegExp?: RegExp;
    }>;
    'font-family'?: string;
    'font-style'?: string;
    'font-weight'?: string;
    'font-stretch'?: string;
    'unicode-range'?: string;
    'size-adjust'?: string;
    'ascent-override'?: string;
    'descent-override'?: string;
    'line-gap-override'?: string;
    [key: string]: unknown;
}
export declare function getUnusedVariantsStylesheet(fontUsages: FontUsageLike[], accumulatedFontFaceDeclarations: UnusedDeclaration[]): string;
export declare function getFontUsageStylesheet(fontUsages: FontUsageLike[]): string;
export declare function getCodepoints(text: string): number[];
export declare function cssAssetIsEmpty(cssAsset: {
    parseTree: {
        nodes?: Array<{
            type: string;
            text?: string;
        }>;
    };
}): boolean;
export type RangeWarnFn = (err: Error) => void;
export declare function parseFontWeightRange(str: string | undefined, warn?: RangeWarnFn): [number, number];
export declare function parseFontStretchRange(str: string | undefined, warn?: RangeWarnFn): [number, number];
export declare function uniqueChars(text: string): string;
export declare function uniqueCharsFromArray(texts: string[]): string;
export declare function hashHexPrefix(stringOrBuffer: string | Buffer | Uint8Array): string;
export {};
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