From e9a5b2aaeb2a59495c5245cb283d2df7c117796b Mon Sep 17 00:00:00 2001
From: navya9singh <108360753+navya9singh@users.noreply.github.com>
Date: Tue, 7 Feb 2023 00:06:04 +0000
Subject: [PATCH] Adding fix for crash and changing test names

---
 src/compiler/binder.ts                                       | 3 +++
 ...> undefinedEntityWithImmediateAndPrototypeAssignments.ts} | 5 +++--
 ... undefinedEntityWithImmediateAndPrototypeAssignments1.ts} | 4 ++--
 3 files changed, 8 insertions(+), 4 deletions(-)
 rename tests/cases/compiler/{undefinedEntityLanguageService.ts => undefinedEntityWithImmediateAndPrototypeAssignments.ts} (68%)
 rename tests/cases/fourslash/{undefinedEntityLanguageServiceError.ts => undefinedEntityWithImmediateAndPrototypeAssignments1.ts} (85%)

diff --git a/src/compiler/binder.ts b/src/compiler/binder.ts
index 5714ec93045..a8547d9b49f 100644
--- a/src/compiler/binder.ts
+++ b/src/compiler/binder.ts
@@ -3341,6 +3341,9 @@ function createBinder(): (file: SourceFile, options: CompilerOptions) => void {
                 }
             });
         }
+        if (isPrototypeProperty && namespaceSymbol && namespaceSymbol.valueDeclaration) {
+            if (isAssignmentDeclaration(namespaceSymbol.valueDeclaration)) containerIsClass = false;
+        }
         if (containerIsClass && namespaceSymbol && namespaceSymbol.valueDeclaration) {
             addDeclarationToSymbol(namespaceSymbol, namespaceSymbol.valueDeclaration, SymbolFlags.Class);
         }
diff --git a/tests/cases/compiler/undefinedEntityLanguageService.ts b/tests/cases/compiler/undefinedEntityWithImmediateAndPrototypeAssignments.ts
similarity index 68%
rename from tests/cases/compiler/undefinedEntityLanguageService.ts
rename to tests/cases/compiler/undefinedEntityWithImmediateAndPrototypeAssignments.ts
index 90d3a7b53c6..5d91844c873 100644
--- a/tests/cases/compiler/undefinedEntityLanguageService.ts
+++ b/tests/cases/compiler/undefinedEntityWithImmediateAndPrototypeAssignments.ts
@@ -1,6 +1,7 @@
-// @filename: a.js
+// @noEmit: true
 // @checkJs: true
 
+// @filename: a.js
 Thing.abc = 123
 Thing.prototype.def = 456
-new Thing();
\ No newline at end of file
+new Thing();
diff --git a/tests/cases/fourslash/undefinedEntityLanguageServiceError.ts b/tests/cases/fourslash/undefinedEntityWithImmediateAndPrototypeAssignments1.ts
similarity index 85%
rename from tests/cases/fourslash/undefinedEntityLanguageServiceError.ts
rename to tests/cases/fourslash/undefinedEntityWithImmediateAndPrototypeAssignments1.ts
index f4f68ceb97d..2bc5950f12c 100644
--- a/tests/cases/fourslash/undefinedEntityLanguageServiceError.ts
+++ b/tests/cases/fourslash/undefinedEntityWithImmediateAndPrototypeAssignments1.ts
@@ -1,11 +1,11 @@
 /// <reference path="fourslash.ts" />
 
-// @Filename: a.js
 // @allowJs: true
 
+// @Filename: a.js
 //// Thing.abc = 123
 //// Thing.prototype.def = 456
 //// new Thing/**/();
 
 verify.goToDefinition("", "");
-verify.noErrors();
\ No newline at end of file
+verify.noErrors();