Getting intellisense in Visual Studio Code for AngularJs in TypeScript is not as straightforward as one would expect. Follow these steps below to get it working

Open Visual Studio Code
Press CTRL+` and run these commands:
tsc –init
npm install typings –global
typings install dt~jquery --global --save
typings install dt~angular

Now, if you run tsc compiler, your will get errors like so:

in order to fix it:
- create a
global.d.ts file inside typings folder. It will be a new entry point for your TypeScript
- add
import * as angular from "angular" as a first line
- add
/// <reference path="index.d.ts" /> following that:

Modify
tsconfig.json include "files" property to reference the new
global.d.ts file: :
{
"compilerOptions": {
"target": "es5",
"sourceMap": true
},
"files": [
"typings/global.d.ts"
]
}
Let TypeScript compiler know which folder contains your .ts code by adding “include” property to the
tsconfig.json file:
"include": ["src/*"]
where src/ is your source code folder

Run TypeScript compiler and start watching the files:
tsc --watch

Now you get angular and jQuery intellisense in TypeScript:

Well. it’s not really SharePoint specific, but it’s nice to know SharePoint developers can use the same steps.
If you are searching for a quick start with SharePoint and modern tools have a look at
these articles by Andrew Koltyakov.