URLSearchParams Error with Outgoing Webhooks

Description:

When trying to convert JSON to application/x-www-form-urlencoded with URLSearchParams in an Outgoing Web Hook.

I'm trying to use RocketChat outgoing webhook with Twilio SMS API

Here's my snippet of Outgoing Webhook

let newBody = new URLSearchParams({
	// From and To are E.164 phone number format
	'From' : '',
	'To' : '',
	'Body': text = request.data.text
})

Steps to reproduce:

1. Create an Outgoing Webhook
2. Create JSON array
3. Try to use URLSearchParams to convert to urlencoded capable string
4. Try to trigger Outgoing Webhook
5. Receive error in Logs

Expected behavior:

I'm expecting the Outoing Webhook to work.

Actual behavior:

I receive the error below

I20210817-19:13:49.086(0) server.js:204 Integrations ➔ Outgoing WebHook.error Error running Script in the Integration Twilio-Outgoing: I20210817-19:13:49.089(0) server.js:204 Integrations ➔ Outgoing WebHook.error Stack: 

I20210817-19:13:49.091(0) server.js:204 Integrations ➔ Outgoing WebHook.error   Error: ReferenceError: URLSearchParams is not defined       at evalmachine.<anonymous>:11:33       at /app/bundle/programs/server/npm/node_modules/meteor/promise/node_modules/meteor-promise/fiber_pool.js:43:40 

Server Setup Information:

• Version of Rocket.Chat Server: 3.17.0
• Operating System: Debian 10 (Buster)
• Deployment Method: Docker
• Number of Running Instances: 1
• DB Replicaset Oplog: [not sure]
• NodeJS Version: lsb_release -a
• MongoDB Version: lsb_release -a

Client Setup Information

• Desktop App or Browser Version: Affects both desktop app and browser
• Operating System: Windows 10

Additional context

Per this article, the workaround is to use encodeURIComponent. So, I'm not sure if URLSearchParams is supposed to be there.

var details = {
	// From and To are E.164 phone number format
	'From' : '',
	'To' :'+1' + number,
	'Body': text[1]
};
		
var message = [];
for (var property in details) {
	var encodedKey = encodeURIComponent(property);
	var encodedValue = encodeURIComponent(details[property]);
	message.push(encodedKey + "=" + encodedValue);
}
message = message.join("&");

Relevant logs:

The issue names the Outgoing Webhook script runtime but no source file or test. Reproduce the URLSearchParams ReferenceError with the provided snippet, then trace how webhook scripts expose runtime APIs. Done means the supported behavior for URLSearchParams is established and the Twilio-style webhook scenario is verified.