- **[Breaking]** Removed support for `@phantom`, `@metaExtension`, `@extension`, `@pureAbstract` compiler annotations. As of this version **these will no longer function!** For help upgrading your code see [the deprecated annotation docs](https://typescripttolua.github.io/docs/advanced/compiler-annotations#deprecated).

- Added official support for **Lua 5.4**.

- Added the `LuaTable<TKey, TValue>` language extension. This allows the use of barebones Lua tables for key-value storage, without suffering from JS's forced string indexes. For more information see [the LuaTable docs](https://typescripttolua.github.io/docs/advanced/language-extensions#lua-table-types).

- Deprecated `@vararg`. Instead, tstl will figure out itself when use of the Lua ellipsis token (`...`) is appropriate. Also language extension `$vararg` was added to force use of the ellipsis token. See [the docs](https://typescripttolua.github.io/docs/advanced/language-extensions#vararg-constant) for more information.

- Added `trailingComments` and `leadingComments` fields to statements in the Lua AST. These can be modified by plugins to emit comments in the output lua. For an example see [the add-comments test plugin](https://github.com/TypeScriptToLua/TypeScriptToLua/blob/master/test/transpile/plugins/add-comments.ts).

Under the hood:

- Tests are now run on a WebAssembly-compiled version of official Lua releases. This means we can now execute test Lua on all Lua versions (except LuaJIT). Shoutout to [Fengari](https://github.com/fengari-lua/fengari) for serving us well for a long time.