Macro declare_plugin 

macro_rules! declare_plugin {
    ($plugin_type:ty) => { ... };
}

Declare a plugin’s C ABI entry points for dynamic loading.

This macro generates the extern "C" functions that typewriter-engine calls when loading a plugin from a shared library (.so/.dylib/.dll).

Usage

declare_plugin!(MyPlugin);

This expands to:

• _tw_plugin_create() → returns a raw pointer to a boxed EmitterPlugin
• _tw_plugin_api_version() → returns the API version constant