import { Transform, TransformCallback } from 'node:stream';
import { BufferWithMeta, SymbolMetadata, FontType } from '../../types';
export declare class TransformToCss extends Transform {
    private readonly _fontName;
    private readonly _types;
    private readonly _prefix;
    private readonly _url;
    private readonly _hash?;
    private _isHeaderRendered;
    constructor(fontName: string, types: FontType[], prefix: string, url: string, fontUrlHash: string | 'random' | false);
    private _header;
    _transform(chunk: BufferWithMeta<SymbolMetadata>, _encoding: BufferEncoding, callback: TransformCallback): void;
}