We implement Javascript webresource for form scripting (form onload, field on change,...). Our code need to follow the official document Xrm object, execution context, form context,..
Javascript is not a strong type programing language, we don't have suggession/intellisense like C#, Typescript
In this article, I will show you how to get suggession/intellisense for your JS code
Step 1: Download the file xrm type definition here
Save it to a folder, for example Types\xrm.d.ts
Step 2. Add this line to the top of the JS file that you want to have intellisense
/// <reference path="../Types/xrm.d.ts" />
Step 3: Add type annotation for function param
Step 4. Enjoy the magic
You will have suggestions while typing like this
It also shows suggestions for Xrm.WebApi
That's all. Hope this help you.