Merge branch 'jsOverrideErrors' of https://github.com/stkevintan/TypeScript into jsOverrideErrors

Author: stkevintan

src/compiler/checker.ts

@@ -7201,7 +7201,6 @@ namespace ts {
                             }
                             // We don't know how to serialize this (nested?) binding element
                             Debug.failBadSyntaxKind(node.parent?.parent || node, "Unhandled binding element grandparent kind in declaration serialization");
-                            break;
                         case SyntaxKind.ShorthandPropertyAssignment:
                             if (node.parent?.parent?.kind === SyntaxKind.BinaryExpression) {
                                 // module.exports = { SomeClass }
@@ -8138,7 +8137,6 @@ namespace ts {
                 case TypeSystemPropertyName.ResolvedBaseTypes:
                     return !!(target as InterfaceType).baseTypesResolved;
             }
-            return Debug.assertNever(propertyName);
         }
 
         /**
@@ -30073,7 +30071,6 @@ namespace ts {
                 case SyntaxKind.JsxSelfClosingElement:
                     return resolveJsxOpeningLikeElement(node, candidatesOutArray, checkMode);
             }
-            throw Debug.assertNever(node, "Branch in 'resolveSignature' should be unreachable.");
         }
 
         /**
@@ -31662,7 +31659,6 @@ namespace ts {
                     }
                     return getUnaryResultType(operandType);
             }
-            return errorType;
         }
 
         function checkPostfixUnaryExpression(node: PostfixUnaryExpression): Type {