polymer cli + haunted => classProperties

[Fernando]

warn: js-transform: Unable to optimize /xxx/node_modules/haunted/lib/virtual.js
{
err: 'This experimental syntax requires enabling ' +
"the parser plugin: 'classProperties' (8:12)"
}

[Fernando]

I cant build with polymer with haunted

polymer 1.9.11
node 12.4.0

[Benny Powers - עם ישראל חי!]

try adding https://babeljs.io/docs/en/babel-plugin-proposal-class-properties#docsNav to your babelrc