Convert string to object in Javascript without Apis

Question

I have a string, caught by a function, called package, and its value is equivalent to "edos.desktop".

function callMain(package) {
    //queria fazer tipo assim, é apenas uma suposição:
    package.main();
}

As you can see above, I want to call a function that calls main() within each typed package. Here are two examples:

For each:

callMain("edos.desktop");

The function would make:

edos.package.main();

And I wanted it to be independent of package. For example, I want to call thousands of Packages, one different from the other, but all with dots (".").

And then not to type a thousand times:

  package.main();

I created this function, which would convert such string to variable and call the function main().

In short, I want to do:

//(dentro da função callMain())
"edos.package".main(); //quero que isso vire isso:
edos.package.main();