Property 'BigInt' does not exist on type 'typeof Types'

[jonbarrow]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

7.4.3

Node.js version

18.12.1

MongoDB server version

6.0.9

Typescript version (if applicable)

5.1.6

Description

BigInt is a supported schema type but is not exposed by schematypes.d.ts. However when using JavaScript without TypeScript, this property is accessible and can be used like normal. This prevents you from checking the type of a field to verify if it is a BigInt type using instanceof (see this related PR typegoose/auto-increment#21)

Steps to Reproduce

TypeScript:

import mongoose from 'mongoose';
console.log(mongoose.Schema.Types.BigInt);
// Property 'BigInt' does not exist on type 'typeof Types'. ts(2339)

JavaScript:

const mongoose = require('mongoose');
console.log(mongoose.Schema.Types.BigInt);
/*
[Function: SchemaBigInt] {
  schemaName: 'BigInt',
  defaultOptions: {},
  _cast: [Function: castBigInt],
  set: [Function: set],
  setters: [],
  get: [Function (anonymous)],
  cast: [Function: cast],
  _checkRequired: [Function (anonymous)],
  checkRequired: [Function (anonymous)],
  '$conditionalHandlers': {
    '$gt': [Function: handleSingle],
    '$gte': [Function: handleSingle],
    '$lt': [Function: handleSingle],
    '$lte': [Function: handleSingle],
    '$type': [Function (anonymous)],
    '$exists': [Function (anonymous)],
    '$nin': [Function: handle$in],
    '$ne': [Function: handleSingle],
    '$in': [Function: handle$in],
    '$eq': [Function: handleSingle],
    '$all': [Function: handleArray]
  }
}
*/

Expected Behavior

For BigInt to be accessible at the type level