import from ES6 module to legacy js code

Question

I use babel.js and have a new module foo in my code

foo.js:

export function foo(number) {
    return number + 42;
}

And bunch of big old files where everything is global. And I need to call a foo function from that legacy code.

bar.js:

 ...
 var result = foo(0); 
 ...

But I can't just import foo cause then my bar.js will be a module and unavailable from other old code. Is there a way to import module and retain my bar.js global?

Trever

"But I can't just import foo cause then my bar.js will be a module and unavailable from other old code" You have to import the module file / somehow if you want to use it. What's the context? How can bar.js be used "globally" in the first case. – Cole

Which module loader are you using? Do you transpile to commonjs? – Swat

I use webpack. In bar.js a lot of global variable and function that used in other part of application. – Trever

Answer 1

I had a somewhat similar problem recently. I ended up polluting window object with everything I need in legacy code.

I created separate register.js module for this purpose and included it to my webpack build:

import ClassA from './ClassA'
import ClassB from './ClassB'
import * as utils from './utils'

Object.assign(window, utils)
Object.assign(window, {ClassA, ClassB})

Pettigrew

Great solution! – Clothbound