Temporary monomorphic Node projection

Author: rbuckton

src/compiler/ast.ts

@@ -940,19 +940,19 @@ export class AstNode<N extends Node<SyntaxKind, AstData> = Node<SyntaxKind, AstD
         return new AstNode(SyntaxKind.PropertyAccessExpression, new AstPropertyAccessExpressionData(), AnyNode /* PropertyAccessExpression */);
     }
     static PropertyAccessChain(): AstPropertyAccessChain {
-        return new AstNode(SyntaxKind.PropertyAccessExpression, new AstPropertyAccessExpressionData(), PropertyAccessExpression, NodeFlags.OptionalChain) as AstPropertyAccessChain;
+        return new AstNode(SyntaxKind.PropertyAccessExpression, new AstPropertyAccessExpressionData(), AnyNode as any /* PropertyAccessExpression */, NodeFlags.OptionalChain) as AstPropertyAccessChain;
     }
     static ElementAccessExpression(): AstElementAccessExpression {
         return new AstNode(SyntaxKind.ElementAccessExpression, new AstElementAccessExpressionData(), AnyNode /* ElementAccessExpression */);
     }
     static ElementAccessChain(): AstElementAccessChain {
-        return new AstNode(SyntaxKind.ElementAccessExpression, new AstElementAccessExpressionData(), ElementAccessExpression, NodeFlags.OptionalChain) as AstElementAccessChain;
+        return new AstNode(SyntaxKind.ElementAccessExpression, new AstElementAccessExpressionData(), AnyNode as any /* ElementAccessExpression */, NodeFlags.OptionalChain) as AstElementAccessChain;
     }
     static CallExpression(): AstCallExpression {
         return new AstNode(SyntaxKind.CallExpression, new AstCallExpressionData(), AnyNode /* CallExpression */);
     }
     static CallChain(): AstCallChain {
-        return new AstNode(SyntaxKind.CallExpression, new AstCallExpressionData(), CallExpression, NodeFlags.OptionalChain) as AstCallChain;
+        return new AstNode(SyntaxKind.CallExpression, new AstCallExpressionData(), AnyNode as any /*CallExpression*/, NodeFlags.OptionalChain) as AstCallChain;
     }
     static ExpressionWithTypeArguments(): AstExpressionWithTypeArguments {
         return new AstNode(SyntaxKind.ExpressionWithTypeArguments, new AstExpressionWithTypeArgumentsData(), AnyNode /* ExpressionWithTypeArguments */);
@@ -976,7 +976,7 @@ export class AstNode<N extends Node<SyntaxKind, AstData> = Node<SyntaxKind, AstD
         return new AstNode(SyntaxKind.NonNullExpression, new AstNonNullExpressionData(), AnyNode /* NonNullExpression */);
     }
     static NonNullChain(): AstNonNullChain {
-        return new AstNode(SyntaxKind.NonNullExpression, new AstNonNullExpressionData(), NonNullExpression, NodeFlags.OptionalChain) as AstNonNullChain;
+        return new AstNode(SyntaxKind.NonNullExpression, new AstNonNullExpressionData(), AnyNode as any /* NonNullExpression */, NodeFlags.OptionalChain) as AstNonNullChain;
     }
     static MetaProperty(): AstMetaProperty {
         return new AstNode(SyntaxKind.MetaProperty, new AstMetaPropertyData(), AnyNode /* MetaProperty */);

src/compiler/types.ts

@@ -1245,8 +1245,8 @@ export class Node<
     readonly ast: AstNode<this> = undefined!;
 
     constructor(ast: AstNode<Node<K, T>>) {
-        this.ast = ast as AstNode<this>;
         Object.preventExtensions(this);
+        this.ast = ast as AstNode<this>;
     }
 
     get kind(): K { return this.ast.kind; }
@@ -5050,7 +5050,7 @@ export class CallExpression extends Node<SyntaxKind.CallExpression, AstCallExpre
     get questionDotToken(): QuestionDotToken | undefined { return this.ast.data.questionDotToken?.node; }
     get typeArguments(): NodeArray<TypeNode> | undefined { return this.ast.data.typeArguments?.nodes; }
     get arguments(): NodeArray<Expression> { return this.ast.data.arguments.nodes; }
-
+    
     /** @internal */ set expression(value) { this.ast.data.expression = value.ast; }
     /** @internal */ set questionDotToken(value) { this.ast.data.questionDotToken = value?.ast; }
     /** @internal */ set typeArguments(value) { this.ast.data.typeArguments = value?.ast; }