declare module 'nunjucks' {
  export interface Loader {
    getSource(name: string): { src: string; path: string } | null
  }
  export interface Environment {
    render(name: string, context: Record<string, unknown>, callback: (err: Error | null, res: string) => void): void
    addFilter(name: string, fn: (...args: unknown[]) => void, async?: boolean): void
    getFilter(name: string): (...args: unknown[]) => void
  }
  export class Environment {
    constructor(loaders?: Loader[], opts?: { autoescape?: boolean })
    render(name: string, context: Record<string, unknown>, callback: (err: Error | null, res: string) => void): void
    addFilter(name: string, fn: (...args: unknown[]) => void, async?: boolean): void
    getFilter(name: string): (...args: unknown[]) => void
  }
  const nunjucks: { Environment: typeof Environment }
  export default nunjucks
}