Merge pull request #1075 from neon-bindings/kv/export-self-types

feat(neon-macros): Add `Channel` context for async functions and `this` support

.gitignore

@@ -1,14 +1,26 @@
+# Rust
 target
+rls*.log
+
+# Created by `trybuild` ui tests
+wip
 **/*~
+
+# Node
 **/node_modules
-**/.DS_Store
+npm-debug.log
+
+# JS build
 **/build
+**/dist
+cli/lib
+test/cli/lib
+
+# Neon build
 **/index.node
 **/artifacts.json
-cli/lib
-**/dist
 pkgs/create-neon/create-neon-test-project
 pkgs/create-neon/create-neon-manual-test-project
-test/cli/lib
-npm-debug.log
-rls*.log
+
+# System
+**/.DS_Store

crates/neon-macros/src/export/function/meta.rs

@@ -4,6 +4,7 @@ pub(crate) struct Meta {
     pub(super) name: Option<syn::LitStr>,
     pub(super) json: bool,
     pub(super) context: bool,
+    pub(super) this: bool,
 }
 
 #[derive(Default)]
@@ -28,33 +29,29 @@ impl Meta {
         Ok(())
     }
 
-    fn force_context(&mut self, meta: syn::meta::ParseNestedMeta) -> syn::Result<()> {
-        match self.kind {
-            Kind::Normal | Kind::AsyncFn => {}
-            Kind::Async => return Err(meta.error(super::ASYNC_CX_ERROR)),
-            Kind::Task => return Err(meta.error(super::TASK_CX_ERROR)),
-        }
-
+    fn force_context(&mut self, _meta: syn::meta::ParseNestedMeta) -> syn::Result<()> {
         self.context = true;
 
         Ok(())
     }
 
+    fn force_this(&mut self, _meta: syn::meta::ParseNestedMeta) -> syn::Result<()> {
+        self.this = true;
+
+        Ok(())
+    }
+
     fn make_async(&mut self, meta: syn::meta::ParseNestedMeta) -> syn::Result<()> {
         if matches!(self.kind, Kind::AsyncFn) {
-            return Err(meta.error(super::ASYNC_FN_ERROR));
+            return Err(meta.error("`async` attribute should not be used with an `async fn`"));
         }
 
         self.kind = Kind::Async;
 
         Ok(())
     }
 
-    fn make_task(&mut self, meta: syn::meta::ParseNestedMeta) -> syn::Result<()> {
-        if self.context {
-            return Err(meta.error(super::TASK_CX_ERROR));
-        }
-
+    fn make_task(&mut self, _meta: syn::meta::ParseNestedMeta) -> syn::Result<()> {
         self.kind = Kind::Task;
 
         Ok(())
@@ -93,6 +90,10 @@ impl syn::parse::Parser for Parser {
                 return attr.force_context(meta);
             }
 
+            if meta.path.is_ident("this") {
+                return attr.force_this(meta);
+            }
+
             if meta.path.is_ident("async") {
                 return attr.make_async(meta);
             }