import type { WritableOptions } from 'node:stream';
import type { Options } from './models.ts';
import { Writable } from 'node:stream';
export declare class FastImageStream extends Writable {
    buffer: Buffer;
    threshold: number;
    start: bigint;
    finished: boolean;
    constructor(options: Partial<Options> & WritableOptions);
    analyze(chunk: Buffer): void;
    _write(chunk: Buffer, _e: BufferEncoding, cb: (error?: Error | null) => void): void;
    _writev(chunks: {
        chunk: Buffer;
    }[], cb: (error?: Error | null) => void): void;
    _final(cb: (error?: Error | null) => void): void;
}