How to include external Javascript library in an Ionic 2 TypeScript project?

Question

I build an Ionic Project using Ionic 2, Angular 2 and TypeScript to test the framework a bit. I need to include an external library (ntc.js) to my project, since I need it t

Answer 1

Besides doing a declare var which tells ts that the variable exists you can use typings of typescript. By writing

typings install libraryname

In your console you get a file that already has declare var/class and you can see all of its functions/properties when you import it.

import {lib} from 'libraryname';

Answer 2

You import it by adding it to your index.html like any other regular javascript file.

Then in your ts file you do:

declare var Tree:any; 

Then in your code, you can use the Tree variable, albeit it exists in the Javascript file. this line of code is basically telling the typescript compiler there is a variable out there Tree which it should ignore.