Winston transporter TypeScript error

[steveklebanoff]

The following code does not compile w/ TypeScript:

import { Timber } from '@timberio/node';
import { TimberTransport } from '@timberio/winston';
import * as winston from 'winston';

import { TIMBER_API_KEY } from './constants';

const timberApiKey = TIMBER_API_KEY;
if (typeof timberApiKey === 'undefined') {
    throw new Error('Please specify Timber API Key');
}

const timber = new Timber(timberApiKey);
const transporter = new TimberTransport(timber);
const logger = winston.createLogger({
    transports: [transporter],
});

Versions:

@timberio/node 0.30.0
@timberio/winston 0.30.0
winston 3.2.1
winston-transport 4.3.0

That being said, if I cast transporter as any things seem to work