error TS7016: Could not find a declaration file for module 'mongodb'

[Asier Bayón]

• I'm submitting a ...
  [x] bug report
  [ ] feature request
  [ ] question about the decisions made in the repository
  [ ] question about how to use this project

• Summary
  Express Typescript app crashes on build with the following error

node_modules/connect-mongo/build/main/lib/MongoStore.d.ts:2:83 - error TS7016: Could not find a declaration file for module 'mongodb'. '/mnt/c/Users/asier/dev/justlaunched/api/node_modules/mongodb/lib/mongodb/index.js' implicitly 
has an 'any' type.
  If the 'mongodb' package actually exposes this module, consider sending a pull request to amend 'https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/mongodb'

import { Collection, MongoClient, MongoClientOptions, WriteConcernSettings } from 'mongodb';

• Other information (e.g. detailed explanation, stack traces, related issues, suggestions how to fix, links for us to have context, eg. StackOverflow, personal fork, etc.)

import expressSession from 'express-session';
import MongoStore from 'connect-mongo';

const session = expressSession({
  secret: process.env.SESSION_SECRET
  saveUninitialized: false,
  resave: false,
  cookie: {
    secure: (process.env.SESSION_SECURE && true) || false,
    httpOnly: true,
    maxAge: Number(process.env.SESSION_MAX_AGE) || 3600000
  },
  store: new MongoStore({
    ttl: Number(process.env.SESSION_MAX_AGE) || 3600,
    mongoUrl: process.env.MONGODB_URI || 'mongodb://127.0.0.1:27017/justlaunched',
    mongoOptions: { useUnifiedTopology: true }
  })
});

export default session;