✨ add wasm coverage and trace context

src-async/BitLoggerAsync_test.mbt

@@ -455,6 +455,30 @@ async test "async logger with_context_fields prepends shared fields without muta
   inspect(written_fields.val[2].value, content="test")
 }
 
+///|
+test "async facades bind trace context through standard fields" {
+  let context = @bitlogger.trace_context("trace-async", "span-async")
+  let base = async_logger(
+    @bitlogger.callback_sink(fn(_) {  }),
+    config=AsyncLoggerConfig::new(max_pending=4),
+    min_level=@bitlogger.Level::Info,
+  )
+  let derived = base.with_trace_context(context)
+  inspect(base.context_fields.length(), content="0")
+  inspect(derived.context_fields.length(), content="3")
+  inspect(derived.context_fields[0].key, content="trace_id")
+  inspect(derived.context_fields[0].value, content="trace-async")
+  inspect(derived.context_fields[1].key, content="span_id")
+  inspect(derived.context_fields[2].value, content="01")
+
+  let library = LibraryAsyncLogger::new(@bitlogger.callback_sink(fn(_) {  })).with_trace_context(
+    context,
+  )
+  let full = library.to_async_logger()
+  inspect(full.context_fields.length(), content="3")
+  inspect(full.context_fields[1].value, content="span-async")
+}
+
 ///|
 async test "async logger child composes target and preserves other state" {
   let written_target : Ref[String] = Ref("")

src-async/async_logger_shared.mbt

@@ -274,6 +274,14 @@ pub fn[S] AsyncLogger::with_context_fields(
   { ..self, context_fields: fields }
 }
 
+///|
+pub fn[S] AsyncLogger::with_trace_context(
+  self : AsyncLogger[S],
+  context : @bitlogger.TraceContext,
+) -> AsyncLogger[S] {
+  self.with_context_fields(context.as_fields())
+}
+
 ///|
 pub fn[S] AsyncLogger::with_filter(
   self : AsyncLogger[S],

src-async/async_native_file_integration_test.mbt

@@ -0,0 +1,90 @@
+///|
+async test "native async file lifecycle flushes rotates and restarts" {
+  if !@bitlogger.native_files_supported() {
+    inspect(@bitlogger.native_files_supported(), content="false")
+  } else {
+    let path = "logs/bitlogger-async-native-e2e.log"
+    let first_flushes : Ref[Int] = Ref(0)
+    let first_sink = @bitlogger.file_sink(
+      path,
+      append=false,
+      auto_flush=false,
+      rotation=Some(@bitlogger.file_rotation(8, max_backups=1)),
+      formatter=fn(rec) { rec.message },
+    )
+    let first = async_logger(
+      first_sink,
+      config=AsyncLoggerConfig::new(
+        max_pending=4,
+        overflow=AsyncOverflowPolicy::Blocking,
+        max_batch=4,
+        linger_ms=0,
+        flush=AsyncFlushPolicy::Batch,
+      ),
+      min_level=@bitlogger.Level::Info,
+      target="async.file.e2e",
+      flush=fn(sink) {
+        first_flushes.val += 1
+        ignore(sink.flush())
+      },
+    )
+
+    @async.with_task_group(group => {
+      group.spawn_bg(() => first.run())
+      first.info("first-record")
+      first.shutdown()
+    })
+
+    inspect(first.is_closed(), content="true")
+    inspect(first.has_failed(), content="false")
+    inspect(first.pending_count(), content="0")
+    inspect(first_flushes.val > 0, content="true")
+    inspect(first_sink.path(), content="logs/bitlogger-async-native-e2e.log")
+    inspect(first_sink.rotation_enabled(), content="true")
+    inspect(first_sink.rotation_failures(), content="0")
+    inspect(first_sink.write_failures(), content="0")
+    inspect(first_sink.flush_failures(), content="0")
+    inspect(first_sink.close(), content="true")
+
+    let restart_flushes : Ref[Int] = Ref(0)
+    let restarted_sink = @bitlogger.file_sink(
+      path,
+      append=true,
+      auto_flush=false,
+      rotation=Some(@bitlogger.file_rotation(8, max_backups=1)),
+      formatter=fn(rec) { rec.message },
+    )
+    let restarted = async_logger(
+      restarted_sink,
+      config=AsyncLoggerConfig::new(
+        max_pending=4,
+        overflow=AsyncOverflowPolicy::Blocking,
+        max_batch=4,
+        linger_ms=0,
+        flush=AsyncFlushPolicy::Shutdown,
+      ),
+      min_level=@bitlogger.Level::Info,
+      target="async.file.e2e",
+      flush=fn(sink) {
+        restart_flushes.val += 1
+        ignore(sink.flush())
+      },
+    )
+
+    @async.with_task_group(group => {
+      group.spawn_bg(() => restarted.run())
+      restarted.info("second-record")
+      restarted.shutdown()
+    })
+
+    inspect(restarted.is_closed(), content="true")
+    inspect(restarted.has_failed(), content="false")
+    inspect(restarted.pending_count(), content="0")
+    inspect(restart_flushes.val, content="1")
+    inspect(restarted_sink.rotation_enabled(), content="true")
+    inspect(restarted_sink.rotation_failures(), content="0")
+    inspect(restarted_sink.write_failures(), content="0")
+    inspect(restarted_sink.flush_failures(), content="0")
+    inspect(restarted_sink.close(), content="true")
+  }
+}

src-async/library_async_logger.mbt

@@ -93,6 +93,14 @@ pub fn[S] LibraryAsyncLogger::bind(
   self.with_context_fields(fields)
 }
 
+///|
+pub fn[S] LibraryAsyncLogger::with_trace_context(
+  self : LibraryAsyncLogger[S],
+  context : @bitlogger.TraceContext,
+) -> LibraryAsyncLogger[S] {
+  library_async_logger(self.inner.with_trace_context(context))
+}
+
 ///|
 pub fn[S] LibraryAsyncLogger::is_enabled(
   self : LibraryAsyncLogger[S],

src-async/pkg.generated.mbti

@@ -114,6 +114,7 @@ pub fn[S] AsyncLogger::with_min_level(Self[S], @core.Level) -> Self[S]
 pub fn[S] AsyncLogger::with_patch(Self[S], (@core.Record) -> @core.Record) -> Self[S]
 pub fn[S] AsyncLogger::with_target(Self[S], String) -> Self[S]
 pub fn[S] AsyncLogger::with_timestamp(Self[S], enabled? : Bool) -> Self[S]
+pub fn[S] AsyncLogger::with_trace_context(Self[S], @core.TraceContext) -> Self[S]
 
 pub struct LibraryAsyncLogger[S] {
   inner : AsyncLogger[S]
@@ -131,6 +132,7 @@ pub fn[S] LibraryAsyncLogger::to_async_logger(Self[S]) -> AsyncLogger[S]
 pub async fn[S] LibraryAsyncLogger::warn(Self[S], String, fields? : Array[@core.Field]) -> Unit
 pub fn[S] LibraryAsyncLogger::with_context_fields(Self[S], Array[@core.Field]) -> Self[S]
 pub fn[S] LibraryAsyncLogger::with_target(Self[S], String) -> Self[S]
+pub fn[S] LibraryAsyncLogger::with_trace_context(Self[S], @core.TraceContext) -> Self[S]
 
 // Type aliases
 pub type ApplicationAsyncLogger = AsyncLogger[@runtime.RuntimeSink]