Getting "Can’t find variable: babelHelpers" when I set compile to true

[Homa]

Description

I use Polymer 2.0 and my build setting is: "builds": [ { "name": "bundled", "bundle": true, "js": { "compile": true, "minify": true}, "css": { "minify": true }, "html": { "minify": true } }

EDIT: I was getting "Can’t find variable: babelHelpers" error when I was using polymer-cli locally. After installing latest polymer-cli globally, now I get “Constructor requires ‘new’ operator” in safari and “Failed to construct ‘HTMLElement’: Please use the ‘new’ operator, this DOM object constructor cannot be called as a function.” in chrome.

sample project: https://github.com/Homa/polymer2-test

Versions & Environment

• Polymer CLI: 1.1.0
• Polymer: 2.0.0
• node: v7.8.0
• Operating System: MacOS

[Homa]

used webcomponents-loader.js instead of webcomponents-lite.js and my problem solved.