import type { CSSOpts } from "./api.js";
export interface FontFaceSpec {
    family: string;
    src: {
        format: string;
        url: string;
    }[];
    style: string;
    weight: string;
    stretch?: string;
    display?: string;
    unicode?: string[];
    ascent?: string;
    descent?: string;
    feature?: string;
    variation?: string;
    lineGap?: string;
    size?: string;
}
export declare const at_fontface: (spec: FontFaceSpec) => (acc: string[], opts: CSSOpts) => string[];
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