Typings on LoggerOptions and Logger interfaces.

[vanflux]

Some typings are missing on index.d.ts.

Missing fields:
on LoggerOptions interface:

• handleRejections (boolean)
• rejectionHandlers (any)

on Logger interface (suggested by DABH):

• rejections (RejectionHandler)

Missing interfaces (suggested by DABH):

• RejectionHandler

This commit fix it (3 commits):

Issue: #1801

---

One workaround for part of the problem(only for missing fields on LoggerOptions) is doing a declaration merging on winston module.

declare module 'winston' {
    export interface LoggerOptions {
        handleRejections?: boolean;
        rejectionHandlers?: any;
    }
}

export {}

[DABH]

@vanflux Can you please try to combine this with #1929 ? (E.g. cherry-pick those commits into here?) I think some combo of these two PRs will be good.

[vanflux]

@vanflux Can you please try to combine this with #1929 ? (E.g. cherry-pick those commits into here?) I think some combo of these two PRs will be good.

Combined

[pbddog]

With Winston v3.7.1 installed, the rejections instance does not exist resulting in an unhandled exception.

const winston = require('winston');

winston.rejections.handle(
    new winston.transports.File({ filename: 'rejections.log' })
);

const p = Promise.reject(new Error('Something failed miserably!'));
p.then(()=>console.log('Done'));