Polymer-cli complains about isIfSentence of null

[kenchris]

This seems to be a Babel issue fixed in latest version:

babel/minify#850

[johnthad]

I'm seeing this, too, in my app, which is based off pwa-starter-kit (though I do not see the error there or with the books PWA).

[Ludogo]

Got the same error
`

pwa-starter-kit@0.9.0 build:prpl-server /home//Dev/**
polymer build --auto-base-path && gulp prpl-server

info: Clearing build/ directory...
info: (esm-bundled) Building...
info: (es6-bundled) Building...
info: (es5-bundled) Building...
warn: js-transform: Unable to optimize /home/ludo/Dev/EcareMobile/src/components/my-app.js
{ err: 'Cannot read property 'isIfStatement' of null' }

`

[usergenic]

#3388 should fix this. Bugs in babel-preset-minify - disabling some of the features/plugins it uses works around this.

[usergenic]

Published polymer-build@3.1.3 and polymer-cli@1.9.8 9 days ago. Fixed this.