Direct Line does not work on Node.js based on current instructions

#L549 contains a reference to a WebAPI-only constructors FormData and Blob which are not present in Node. This yields the error: ReferenceError: FormData is not defined. or ReferenceError: Blob is not defined.

The current README does not adequately describe the steps needed to use DirectLine in a Node app. Primarily the requirement for polyfills attached to the global object for both Blob and FormData.

[billba]

We’ve had a few people use this with Node, usually for proxy work like making Alexa work with Bot Framework bots via Direct Line.

@justinwilaby I believe there are polyfills out there for FormData and Blob which should let you use DLJS with Node.

[kushalbhabra]

Hi, I’m using DirectLine JS 0.14.1 and trying to send attachment but getting an error from the library.

ReferenceError: FormData is not defined
    at MergeMapSubscriber.project (C:\Users\Kushal\Documents\code\nodejs-azure\b\smpls\samples\javascript_nodejs\13.core-bot\node_modules\botframework-directlinejs\lib\directLine.js:518:9)

I’ve also added below two lines in my application

global.XMLHttpRequest = require('xhr2');
global.WebSocket = require('ws');

Is there anything else to be done so that formdata and blob don’t fail?