getReferences Callback is required

System information

• node version:
• npm or yarn version:
• OS/version/architecture:
• Applicable nodegit version:

v12.12.0
6.11.3
darwin
19.0.0
x64

This seems like a bug:

import * as Git from "nodegit"

Git.Repository.open(".")
  .then(async repo => {
    return repo.getReferences(Git.Reference.TYPE.OID)
  })
  .catch(console.error)

❯ yarn -s ts-node test.ts
Error: Callback is required and must be a Function.
    at /Users/jasonkuhrt/projects/prisma-labs/libre/node_modules/nodegit-promise/lib/node-extensions.js:24:20
    at tryCallTwo (/Users/jasonkuhrt/projects/prisma-labs/libre/node_modules/nodegit-promise/lib/core.js:45:5)
    at doResolve (/Users/jasonkuhrt/projects/prisma-labs/libre/node_modules/nodegit-promise/lib/core.js:173:13)
    at new Promise (/Users/jasonkuhrt/projects/prisma-labs/libre/node_modules/nodegit-promise/lib/core.js:65:3)
    at Repository.getReferences (/Users/jasonkuhrt/projects/prisma-labs/libre/node_modules/nodegit-promise/lib/node-extensions.js:19:12)
    at /Users/jasonkuhrt/projects/prisma-labs/libre/test.ts:6:17
    at Generator.next (<anonymous>)
    at /Users/jasonkuhrt/projects/prisma-labs/libre/test.ts:8:71
    at new Promise (<anonymous>)
    at __awaiter (/Users/jasonkuhrt/projects/prisma-labs/libre/test.ts:4:12)

Maybe related https://github.com/nodegit/nodegit/issues/1726

Compare the reported call in test.ts with Repository.getReferences in node-extensions.js and review the related issue #1726. Reproduce the shown Node/TypeScript example and inspect the existing promise/callback behavior; done means the call no longer raises the reported callback error and its references result can be observed.