how to implement regions/code collapse in javascript

Question

How can you implement regions a.k.a. code collapse for JavaScript in Visual Studio?

If there are hundreds of lines in javascript, it\'ll be more understandable using

Answer 1

This is now natively in VS2017:

//#region fold this up

//#endregion

Whitespace between the // and # does not matter.

I do not know what version this was added in, as I cannot find any mention of it in the changelogs. I am able to use it in v15.7.3.