[6.x] Add configuring callback functionality to statamic.js

[maurice-ellis]

An additional callback is needed to configure the Vue app before it's mounted, adding globalProperties and plugins, since this cannot be done after the app is mounted.

[jasonvarga]

Can you show an example of what you plan to do with this?

[maurice-ellis]

Yes, @jasonvarga, something like this in my V6 addon I'm working on. I tried looking at the code to see if there was another way and I couldn't find anything. Boot is called before the app is created and booted is called after the app is already mounted.

Statamic.configuring(() => {
    Statamic.$app.use(Plugin);
    Statamic.$app.use(PerfectScrollbarPlugin);

    Object.assign(Statamic.$app.config.globalProperties, {
        $something: something,
    });
});