Modules
Every concrete subclass must also declare `static readonly moduleKey`, the property name it's attached
under on {@link E621} (e.g. `"posts"`) - used by `createStandalone`. TypeScript can't enforce abstract
static members, so this is a convention rather than a compiler-checked contract.
Modules
Every concrete subclass must also declare `static readonly moduleKey`, the property name it's attached
under on {@link E621} (e.g. `"posts"`) - used by `createStandalone`. TypeScript can't enforce abstract
static members, so this is a convention rather than a compiler-checked contract.