What version of this package are you using?

14.3.1

What operating system, Node.js, and npm version?

macOS 10.14.6
Node.js 12.10.0
npm 6.11.3

What happened?

I had the following code:

buffer.writeBigUInt64LE(BigInt(createdAt.getTime()), 0)

Got the following error:

'BigInt' is not defined.

This was mentioned as fixed in 14.1.0 here: #1378 (comment)

What did you expect to happen?

No error

Are you willing to submit a pull request to fix this bug?

Yes