/// <reference types="node" />
export type Content = {
    buffer: Buffer;
    mimeType: string;
    expire?: number;
};
export type Cache = {
    capacity?: number;
    usedSize: number;
    expireInterval?: number;
    files: Record<string, Content>;
};
export type Callback = (err: any, content: Content) => void;
export type GetFileFn = (file: string, cb: Callback) => void;