arrow function cause yarn run build error

[vagusX]

https://github.com/jscissr/react-polymer/blob/master/index.js#L65

static/js/main.ba291ce8.js from UglifyJs
SyntaxError: Unexpected token: operator (>) [./~/react-polymer/index.js:65,0]

error Command failed with exit code 1.

[jscissr]

This should work when mishoo/UglifyJS#448 is fixed. Until then, you need to use a transpiler, for example Babel.