Serialize typedef parameters (including function typed ones) to Kernel and use it to resynthesize t…

pkg/kernel/lib/ast.dart

Index: pkg/kernel/lib/ast.dart
diff --git a/pkg/kernel/lib/ast.dart b/pkg/kernel/lib/ast.dart
index aa87ce4365967d195807defef4037c6bfd6cce83..2d3099c58100a8f49a1731129cdc2e849461a174 100644
--- a/pkg/kernel/lib/ast.dart
+++ b/pkg/kernel/lib/ast.dart
@@ -493,6 +493,16 @@ class Typedef extends NamedNode {
   List<Expression> annotations = const <Expression>[];
   String name;
   final List<TypeParameter> typeParameters;
+
+  @informative
+  int requiredParameterCount = 0;
+
+  @informative
+  List<VariableDeclaration> positionalParameters = <VariableDeclaration>[];
+
+  @informative
+  List<VariableDeclaration> namedParameters = <VariableDeclaration>[];
+
   DartType type;
 
   Typedef(this.name, this.type,
@@ -508,9 +518,22 @@ class Typedef extends NamedNode {
     return v.visitTypedef(this);
   }
 
+  void setParameters(
+      int requiredParameterCount,
+      List<VariableDeclaration> positionalParameters,
+      List<VariableDeclaration> namedParameters) {
+    this.requiredParameterCount = requiredParameterCount;
+    this.positionalParameters = positionalParameters;
+    this.namedParameters = namedParameters;
+    setParents(this.positionalParameters, this);
+    setParents(this.namedParameters, this);
+  }
+
   transformChildren(Transformer v) {
     transformList(annotations, v, this);
     transformList(typeParameters, v, this);
+    transformList(positionalParameters, v, this);
+    transformList(namedParameters, v, this);
     if (type != null) {
       type = v.visitDartType(type);
     }
@@ -519,6 +542,9 @@ class Typedef extends NamedNode {
   visitChildren(Visitor v) {
     visitList(annotations, v);
     visitList(typeParameters, v);
+    visitList(typeParameters, v);
+    visitList(positionalParameters, v);
+    visitList(namedParameters, v);
     type?.accept(v);
   }