Function path_url_rewrite::process_transform

pub fn process_transform(
    program: Program,
    metadata: TransformPluginProgramMetadata
) -> Program

An example plugin function with macro support. plugin_transform macro interop pointers into deserialized structs, as well as returning ptr back to host.

It is possible to opt out from macro by writing transform fn manually if plugin need to handle low-level ptr directly via __transform_plugin_process_impl( ast_ptr: *const u8, ast_ptr_len: i32, unresolved_mark: u32, should_enable_comments_proxy: i32) -> i32 /* 0 for success, fail otherwise. Note this is only for internal pointer interop result, not actual transform result */

This requires manual handling of serialization / deserialization from ptrs. Refer swc_plugin_macro to see how does it work internally.