Module scope

[Thiago Temple]

Hi, I'm playing a little with SystemJS and I have a question about the scope:

Aren't modules suppose to be isolated? I mean, functions and variables that aren't exported shouldn't be in the global scope, right?

I wrote a small script just to test it:

var message = 'Hello World';

function sayHello() {
    console.log(message);
}

console.log('app loaded');

And in my page I'm loading the module using:

System.import('js/app.js');

When I open, the console I can access window.message and window.sayHello. Is that right? I thought that because I haven't exported them they wouldn't be available.

Thanks

[Guy Bedford]

Modules without any import or export syntax are treated as global modules for compatibility.

You can tell SystemJS the module format through metadata and if you set the format to ES module, then these variables won't leak to the global.

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[Thiago Temple]

Thanks, just to be clear, this is a feature of SystemJS? Not something that is drafted in es6 module loader spec?

[Guy Bedford]

Yes exactly.