/// Tier-0 stub. The real implementation loads a vendored liblua via /// `dart:ffi` and exposes a `LuaState` handle that [LuaExtension] uses /// to run script callbacks. Lands at Tier 6. class LuaHost { LuaHost._(); /// Boot the vendored liblua. Throws until Tier 6. static Future start() async { throw UnsupportedError( 'Lua runtime lands at Tier 6 (supporter tool sibling of ptyc).'); } Future dispose() async {} }