fix(49548): show completions after keywords in block (microsoft#49600)

Author: a-tarasyuk

src/services/completions.ts

@@ -4094,6 +4094,10 @@ namespace ts.Completions {
                 }
                 break;
            case SyntaxKind.Identifier: {
+                const originalKeywordKind = (location as Identifier).originalKeywordKind;
+                if (originalKeywordKind && isKeyword(originalKeywordKind)) {
+                    return undefined;
+                }
                 // class c { public prop = c| }
                 if (isPropertyDeclaration(location.parent) && location.parent.initializer === location) {
                     return undefined;

tests/cases/fourslash/completionsAfterKeywordsInBlock.ts

@@ -0,0 +1,50 @@
+/// <reference path="fourslash.ts" />
+
+////class C1 {
+////    method(map: Map<string, string>, key: string, defaultValue: string) {
+////        try {
+////            return map.get(key)!;
+////        }
+////        catch {
+////            return default/*1*/
+////        }
+////    }
+////}
+////class C2 {
+////    method(map: Map<string, string>, key: string, defaultValue: string) {
+////        if (map.has(key)) {
+////            return map.get(key)!;
+////        }
+////        else {
+////            return default/*2*/
+////        }
+////    }
+////}
+////class C3 {
+////    method(map: Map<string, string>, key: string, returnValue: string) {
+////        try {
+////            return map.get(key)!;
+////        }
+////        catch {
+////            return return/*3*/
+////        }
+////    }
+////}
+////class C4 {
+////    method(map: Map<string, string>, key: string, returnValue: string) {
+////        if (map.has(key)) {
+////            return map.get(key)!;
+////        }
+////        else {
+////            return return/*4*/
+////        }
+////    }
+////}
+
+verify.completions({
+    marker: ["1", "2"],
+    includes: [{ name: "defaultValue", sortText: completion.SortText.LocationPriority }]
+}, {
+    marker: ["3", "4"],
+    includes: [{ name: "returnValue", sortText: completion.SortText.LocationPriority }]
+});