/// A lazy compilation proxy's id is the id of the module it stands for, plus this query. The
/// same holds for stable ids.
pub const LAZY_PROXY_QUERY: &str = "?rolldown-lazy=1";
/// The id of the module a lazy proxy stands for: the id its chunk registers a factory under.
/// `None` when `id` is not a lazy proxy.
/// Writes into `buf` the id of the lazy proxy that stands for `target_id`. The proxy exists
/// only when some module calls `import()` on the target.