UnhandledPromiseRejectionWarning: PolyFillNotAvailable

[luizrobertomeier]

I'm following the official docs : "Write a Node.js app to get Outlook mail, calendar, and contacts"

Official URL: https://docs.microsoft.com/en-us/outlook/rest/node-tutorial

And I'm getting the following error:

(node:32431) UnhandledPromiseRejectionWarning: PolyFillNotAvailable: Library cannot function without fetch. So, please provide polyfill for it. at Object.exports.validatePolyFilling (/home/myfolder/node-tutorial/node_modules/@microsoft/microsoft-graph-client/lib/src/ValidatePolyFilling.js:27:21) at new Client (/home/myfolder/node-tutorial/node_modules/@microsoft/microsoft-graph-client/lib/src/Client.js:36:35) at Function.Client.initWithMiddleware (/home/myfolder/node-tutorial/node_modules/@microsoft/microsoft-graph-client/lib/src/Client.js:92:20) at Function.Client.init (/home/myfolder/node-tutorial/node_modules/@microsoft/microsoft-graph-client/lib/src/Client.js:81:23) at /home/myfolder/node-tutorial/routes/calendar.js:19:33 (node:32431) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
node -v = v12.11.1

The section: Mail, Calendar and Contacts don't works.

[jasonjoh]

This should be fixed by #727

Specifically: install isomorphic-fetch:

npm install isomorphic-fetch --save

And require it in mail.js, etc.