fix(ts): Allow parenthesized "assert and assign" (#12933)

Co-authored-by: Nicolò Ribaudo <7000710+nicolo-ribaudo@users.noreply.github.com>

packages/babel-parser/src/plugins/typescript/index.js

@@ -2701,6 +2701,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>
           return super.toAssignable(this.typeCastToParameter(node), isLHS);
         case "TSParameterProperty":
           return super.toAssignable(node, isLHS);
+        case "ParenthesizedExpression":
+          return this.toAssignableParenthesizedExpression(node, isLHS);
         case "TSAsExpression":
         case "TSNonNullExpression":
         case "TSTypeAssertion":
@@ -2711,6 +2713,19 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       }
     }
 
+    toAssignableParenthesizedExpression(node: N.Node, isLHS: boolean) {
+      switch (node.expression.type) {
+        case "TSAsExpression":
+        case "TSNonNullExpression":
+        case "TSTypeAssertion":
+        case "ParenthesizedExpression":
+          node.expression = this.toAssignable(node.expression, isLHS);
+          return node;
+        default:
+          return super.toAssignable(node, isLHS);
+      }
+    }
+
     checkLVal(
       expr: N.Expression,
       contextDescription: string,