Merge pull request #28071 from pesca/improveCodeFix

Improve code fix for missing members

Author: DanielRosenwasser

src/services/codefixes/fixAddMissingMember.ts

@@ -185,6 +185,10 @@ namespace ts.codefix {
             const widenedType = checker.getWidenedType(checker.getBaseTypeOfLiteralType(checker.getTypeAtLocation(otherExpression)));
             typeNode = checker.typeToTypeNode(widenedType, classDeclaration);
         }
+        else {
+            const contextualType = checker.getContextualType(token.parent as Expression);
+            typeNode = contextualType ? checker.typeToTypeNode(contextualType) : undefined;
+        }
         return typeNode || createKeywordTypeNode(SyntaxKind.AnyKeyword);
     }
 

tests/cases/fourslash/codeFixAddMissingMember12.ts

@@ -0,0 +1,14 @@
+/// <reference path='fourslash.ts' />
+
+//// class C {}
+//// const x: number = new C().x;
+
+verify.codeFix({
+    description: "Declare property 'x'",
+    index: 0,
+    newFileContent:
+`class C {
+    x: number;
+}
+const x: number = new C().x;`
+});

tests/cases/fourslash/codeFixAddMissingMember13.ts

@@ -0,0 +1,14 @@
+/// <reference path='fourslash.ts' />
+
+//// class C {}
+//// const x: number = new C().x;
+
+verify.codeFix({
+    description: "Add index signature for property 'x'",
+    index: 1,
+    newFileContent:
+`class C {
+    [x: string]: number;
+}
+const x: number = new C().x;`
+});

tests/cases/fourslash/codeFixAddMissingMember_typeParameter.ts

@@ -19,7 +19,7 @@ verify.codeFix({
     index: 0,
     newFileContent:
 `interface I {
-    bar: any;
+    bar: number;
 }
 
 function f<T>(t: T): number {