How to call a pure javascript function from typescript in angular 1

See more:

Javascript

Typescript

AngularJs

Hi
Note: ANGULAR 1.5.7 version

I have a javascript function in a demo.js file , i need to call this function inside a class in typescript file.
sample code is

//demo.js
function test(){
alert();
}

in Typescript file

module Data.test {
    export class Controller {
          constructor(){
             // i need to call the javascript function here.
             // i just called test() here like this , it is working but when compiling 
             // in visual studio it shows "Cannot find Name test"
               test();
          }
          TestAlert():void{
             // here also i need to call the javascript function  
             // i just called test() here like this , it is working but when compiling 
             // in visual studio it shows "Cannot find Name test"
               test();
          }

  }
}

What I have tried:

I tried

declare var test:any

in typescript file

but when compile it shows error