feat(transpiler): add support for named params to new expressions

Author: vsavkin

tools/transpiler/spec/functions_spec.js

@@ -4,6 +4,11 @@ function sum(a, b) {
  return a + b;
 }
 
+class ConstructorWithNamedParams {
+ constructor(a, {b=1, c=2}) {
+ this.sum = a + b + c;
+ }
+}
 
 export function main() {
  describe('functions', function() {
@@ -35,6 +40,11 @@ export function main() {
  expect(f({a: 10})).toBe(12);
  expect(f()).toBe(3);
  });
+
+ it("should support new expressions", function () {
+ var obj = new ConstructorWithNamedParams(100, {b:10});
+ expect(obj.sum).toEqual(112);
+ });
  });
 
  describe("optional params", function () {

tools/transpiler/src/codegeneration/NamedParamsTransformer.js

@@ -32,11 +32,27 @@ export class NamedParamsTransformer extends ParseTreeTransformer {
  */
  transformCallExpression(tree) {
  tree = super.transformCallExpression(tree);
+ this._handleNamedParams(tree);
+ return tree;
+ }
+
+ /**
+ * Transform new expressions.
+ *
+ * @param {NewExpression} tree
+ * @return {ParseTree}
+ */
+ transformNewExpression(tree) {
+ tree = super.transformNewExpression(tree);
+ this._handleNamedParams(tree);
+ return tree;
+ }
+
+ _handleNamedParams(tree) {
  if (this._isLastArgAnNonEmptyObjectLiteral(tree) &&
  ! this._isLastArgObjectLiteralWithQuotedKeys(tree)) {
  this._replaceLastArgWithNamedParams(tree);
  }
- return tree;
  }
 
  _isLastArgAnNonEmptyObjectLiteral(tree) {