Allow rest parameter type to be a readonly array or tuple

microsoft · ahejlsberg · Jan 29, 2019 · Jan 12, 2019 · Jan 15, 2019 · Jan 15, 2019
commit e5816491bab1a33e6c98a3b599d7ec868f502789
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -23180,7 +23180,7 @@ namespace ts {
 
             // Only check rest parameter type if it's not a binding pattern. Since binding patterns are
             // not allowed in a rest parameter, we already have an error from checkGrammarParameterList.
-            if (node.dotDotDotToken && !isBindingPattern(node.name) && !isTypeAssignableTo(getTypeOfSymbol(node.symbol), anyArrayType)) {
+            if (node.dotDotDotToken && !isBindingPattern(node.name) && !isTypeAssignableTo(getTypeOfSymbol(node.symbol), anyReadonlyArrayType)) {
                 error(node, Diagnostics.A_rest_parameter_must_be_of_an_array_type);
             }
         }