It appears that the repository has undergone several changes and renamings:

backend/node_modules/readdirp/index.d.ts

@@ -1,43 +0,0 @@
-// TypeScript Version: 3.2
-
-/// <reference types="node" lib="esnext" />
-
-import * as fs from 'fs';
-import { Readable } from 'stream';
-
-declare namespace readdir {
-  interface EntryInfo {
-    path: string;
-    fullPath: string;
-    basename: string;
-    stats?: fs.Stats;
-    dirent?: fs.Dirent;
-  }
-
-  interface ReaddirpOptions {
-    root?: string;
-    fileFilter?: string | string[] | ((entry: EntryInfo) => boolean);
-    directoryFilter?: string | string[] | ((entry: EntryInfo) => boolean);
-    type?: 'files' | 'directories' | 'files_directories' | 'all';
-    lstat?: boolean;
-    depth?: number;
-    alwaysStat?: boolean;
-  }
-
-  interface ReaddirpStream extends Readable, AsyncIterable<EntryInfo> {
-    read(): EntryInfo;
-    [Symbol.asyncIterator](): AsyncIterableIterator<EntryInfo>;
-  }
-
-  function promise(
-    root: string,
-    options?: ReaddirpOptions
-  ): Promise<EntryInfo[]>;
-}
-
-declare function readdir(
-  root: string,
-  options?: readdir.ReaddirpOptions
-): readdir.ReaddirpStream;
-
-export = readdir;