addProperty
Registers a new environment property under name. Throws if name is already registered (including defaults such as now). Use overrideProperty to replace an existing registration.
Environment properties are looked up in templates via the @env/name (or @env.name) special identifier.
Parameters
name
the property identifier as it appears after @env/ in a template.
property
the value to bind under name.
Throws
if name is already registered.