Angular 4/5/6 Global Variables

Question

I really struggle with creating global variables in my Angular 2 application.

I already googled and read many posts on StackOverflow on this for the last 3 hours, h

Answer 1

Not really recommended but none of the other answers are really global variables. For a truly global variable you could do this.

Index.html

Component or anything else in Angular

..near the top right after imports:

declare const myTest: any;

...later:

console.warn(myTest); // outputs '1'