How does extjs Ext.require() works

Question

I understand that lets say if we have,

Ext.require([
  'Ext.ux.grid.FiltersFeature',
  'Ext.toolbar.Paging'
]);

it will translate those entries into some_path/ux/grid/FilterFeature.js etc

but how does

Ext.require([
  'Ext.grid.*',
]);

is going to work? it doent know how many js files are below grid/ directory so from client side how can it load them?, is it stuff like lazy loading, i mean if some other file has child js entry it will allow loading?

Thanks

Answer 1

As part of the build process, we generate a "bootstrap" file which contains information about which files exist. So it doesn't query the filesystem, it just asks the bootstrap for everything under Ext.grid.