[SalesForce] Using ObjectType global variable in lightning component

The expression syntax does not support it.

You can use index array referencing, but not what you are doing here.

{!v.target[3]} - Okay

{!v.target.prop} - Okay

What you suggested, no joy.

I suspect that you fall into one of the following:

1) Your code is within a managed package, in which case you would need to alter the reference to include the namespace prefix. If your namespace was 'mynamespace' then you would need the following:

<ltng:require styles="{!$Resource.mynamespace__leaflet + '/leaflet.css'}" 
              scripts="{!$Resource.mynamespace__leaflet + '/leaflet.js'}" 
              afterScriptsLoaded="{!c.jsLoaded}" />

2) Your code is within a component that does not have a client-side controller. In this case your component will be rendered server-side and the $Resource value provider does not work there.

First, $Resource isn’t available until the Lightning Component framework is loaded on the client. Some very simple components that are composed of only markup can be rendered server-side, where $Resource isn’t available. To avoid this, when you create a new app, stub out a client-side controller to force components to be rendered on the client.

Documentation at https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/expr_resource_value_provider.htm