fix(47787): show QF to delete parameter in getter (microsoft#47797)

Author: a-tarasyuk

src/services/codefixes/fixUnusedIdentifier.ts

@@ -316,6 +316,10 @@ namespace ts.codefix {
                 // Setter must have a parameter
                 return false;
 
+            case SyntaxKind.GetAccessor:
+                // Getter cannot have parameters
+                return true;
+
             default:
                 return Debug.failBadSyntaxKind(parent);
         }

src/services/formatting/smartIndenter.ts

@@ -432,6 +432,8 @@ namespace ts.formatting {
                 case SyntaxKind.ConstructorType:
                 case SyntaxKind.ConstructSignature:
                     return getList((node as SignatureDeclaration).typeParameters) || getList((node as SignatureDeclaration).parameters);
+                case SyntaxKind.GetAccessor:
+                    return getList((node as GetAccessorDeclaration).parameters);
                 case SyntaxKind.ClassDeclaration:
                 case SyntaxKind.ClassExpression:
                 case SyntaxKind.InterfaceDeclaration:

tests/cases/fourslash/codeFixUnusedIdentifier_parameterInGetAccessor.ts

@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+// @noUnusedLocals: true
+// @noUnusedParameters: true
+
+////let foo = {
+////    get x(/**/param) {}
+////}
+
+verify.codeFix({
+    description: "Remove unused declaration for: 'param'",
+    index: 0,
+    newFileContent:
+`let foo = {
+    get x() {}
+}`
+})