add hw2

node_modules/sucrase/dist/transformers/OptionalCatchBindingTransformer.js

@@ -0,0 +1,19 @@
+"use strict";Object.defineProperty(exports, "__esModule", {value: true}); function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+var _types = require('../parser/tokenizer/types');
+
+var _Transformer = require('./Transformer'); var _Transformer2 = _interopRequireDefault(_Transformer);
+
+ class OptionalCatchBindingTransformer extends _Transformer2.default {
+  constructor( tokens,  nameManager) {
+    super();this.tokens = tokens;this.nameManager = nameManager;;
+  }
+
+  process() {
+    if (this.tokens.matches2(_types.TokenType._catch, _types.TokenType.braceL)) {
+      this.tokens.copyToken();
+      this.tokens.appendCode(` (${this.nameManager.claimFreeName("e")})`);
+      return true;
+    }
+    return false;
+  }
+} exports.default = OptionalCatchBindingTransformer;