JS: Add a couple more type predicates

Author: knutwannheden

rewrite-javascript/rewrite/src/java/tree.ts

@@ -841,6 +841,8 @@ export const isIf = (tree: any): tree is J.If => tree["kind"] === J.Kind.If;
 export const isLambda = (tree: any): tree is J.Lambda => tree["kind"] === J.Kind.Lambda;
 export const isLiteral = (tree: any): tree is J.Literal => tree["kind"] === J.Kind.Literal;
 export const isMethodDeclaration = (n: any): n is J.MethodDeclaration => n.kind === J.Kind.MethodDeclaration;
+export const isMethodInvocation = (n: any): n is J.MethodInvocation => n.kind === J.Kind.MethodInvocation;
+export const isNewClass = (n: any): n is J.NewClass => n.kind === J.Kind.NewClass;
 export const isVariableDeclarations = (n: any): n is J.VariableDeclarations => n.kind === J.Kind.VariableDeclarations;
 
 export function rightPadded<T extends J | boolean>(t: T, trailing: J.Space, markers?: Markers): J.RightPadded<T> {