declare function depcheck(rootDir: string, options: depcheck.Options): Promise<depcheck.Results>;

declare function depcheck<T>(
  rootDir: string,
  options: depcheck.Options,
  callback: (results: depcheck.Results) => T
): Promise<T>;

declare namespace depcheck {
  interface Node {
    [key: string]: any;
  }

  type Parser = (content: string, filePath: string, deps: ReadonlyArray<string>, rootDir: string) => Node;

  type Detector = (node: Node) => ReadonlyArray<string> | string;

  interface PackageDependencies {
    [dependencyName: string]: string;
  }

  interface Options {
    ignoreBinPackage?: boolean;
    skipMissing?: boolean;
    ignoreDirs?: ReadonlyArray<string>;
    ignoreMatches?: ReadonlyArray<string>;
    package?: {
      dependencies?: PackageDependencies;
      devDependencies?: PackageDependencies;
      peerDependencies?: PackageDependencies;
      optionalDependencies?: PackageDependencies;
    };
    parsers?: {
      [match: string]: Parser;
    };
    detectors?: ReadonlyArray<Detector>;
    specials?: ReadonlyArray<Parser>;
  }

  interface Results {
    dependencies: string[];
    devDependencies: string[];
    using: {
      [dependencyName: string]: string[];
    };
    missing: {
      [dependencyName: string]: string[];
    };
    invalidFiles: {
      [filePath: string]: any;
    };
    invalidDirs: {
      [filePath: string]: any;
    };
  }
«Components»
}

export = depcheck;