Merge pull request #28919 from a-tarasyuk/feature/28893-allow-trailing-comma-on-tuple-types

feature/28893 allow trailing comma on tuple types

Author: DanielRosenwasser

src/compiler/checker.ts

@@ -23641,7 +23641,6 @@ namespace ts {
                     break;
                 }
             }
-            checkGrammarForDisallowedTrailingComma(node.elementTypes);
             forEach(node.elementTypes, checkSourceElement);
         }
 

tests/baselines/reference/TupleType5.errors.txt

@@ -0,0 +1,7 @@
+tests/cases/conformance/parser/ecmascript5/TupleTypes/TupleType6.ts(1,16): error TS1110: Type expected.
+
+
+==== tests/cases/conformance/parser/ecmascript5/TupleTypes/TupleType6.ts (1 errors) ====
+    var v: [number,,]
+                   ~
+!!! error TS1110: Type expected.

tests/baselines/reference/TupleType6.errors.txt

@@ -0,0 +1,5 @@
+//// [TupleType6.ts]
+var v: [number,,]
+
+//// [TupleType6.js]
+var v;

tests/baselines/reference/TupleType6.js

@@ -0,0 +1,4 @@
+=== tests/cases/conformance/parser/ecmascript5/TupleTypes/TupleType6.ts ===
+var v: [number,,]
+>v : Symbol(v, Decl(TupleType6.ts, 0, 3))
+

tests/baselines/reference/TupleType6.symbols

@@ -0,0 +1,4 @@
+=== tests/cases/conformance/parser/ecmascript5/TupleTypes/TupleType6.ts ===
+var v: [number,,]
+>v : [number, any]
+

tests/baselines/reference/TupleType6.types

@@ -0,0 +1 @@
+var v: [number,,]