How to use javascript functions in an Angular 2 component from a different file

Question

I have a javascript file that contains some data manipulation functions (No DOM manipulation at all) such as float rounding, mathematical operations, ...etc

my js fi

Answer 1

I finally found out the answer; it was to basically make a typings file and add it to the project.

The problem was related to TypeScript not Angular2. In typeScript you can't simply use any JS file without having a definition (typing) file that declares the types of the vars, the params of the functions, as well as the returns. check this link to know how to create one.