fix: compile error when using enum in flutter

libs/flutter_rust_bridge_codegen/src/ir/func.rs

@@ -0,0 +1,60 @@
+use crate::ir::*;
+
+#[derive(Debug, Clone)]
+pub struct IrFunc {
+    pub name: String,
+    pub inputs: Vec<IrField>,
+    pub output: IrType,
+    pub fallible: bool,
+    pub mode: IrFuncMode,
+    pub comments: Vec<IrComment>,
+}
+
+impl IrFunc {
+    pub fn wire_func_name(&self) -> String {
+        format!("wire_{}", self.name)
+    }
+}
+
+/// Represents a function's output type
+#[derive(Debug, Clone)]
+pub enum IrFuncOutput {
+    ResultType(IrType),
+    Type(IrType),
+}
+
+/// Represents the type of an argument to a function
+#[derive(Debug, Clone)]
+pub enum IrFuncArg {
+    StreamSinkType(IrType),
+    Type(IrType),
+}
+
+#[derive(Debug, Clone, PartialOrd, PartialEq)]
+pub enum IrFuncMode {
+    Normal,
+    Sync,
+    Stream,
+}
+
+impl IrFuncMode {
+    pub fn dart_return_type(&self, inner: &str) -> String {
+        match self {
+            Self::Normal => format!("Future<{}>", inner),
+            Self::Sync => inner.to_string(),
+            Self::Stream => format!("Stream<{}>", inner),
+        }
+    }
+
+    pub fn ffi_call_mode(&self) -> &'static str {
+        match self {
+            Self::Normal => "Normal",
+            Self::Sync => "Sync",
+            Self::Stream => "Stream",
+        }
+    }
+
+    pub fn has_port_argument(&self) -> bool {
+        self != &Self::Sync
+    }
+}