Uglify fails on 2.0 with RCA

[Psykar]

See https://github.com/Psykar/test-icepick-uglify

RCA transpiles to ES5 before it attempts to uglify, but seems it's falling over on some ES6 syntax. Installing icepick@<2 does work, and I don't have the time to debug this further right now unfortunately, but the repro is pretty simple.

• create-react-app test-icepick-uglify
• cd test-icepick-uglify
• yarn add icepick
• Edit src/App.js to add an icepick import
• yarn build

yarn build v0.24.6
$ react-scripts build 
Creating an optimized production build...
Failed to compile.

static/js/main.fd1459b7.js from UglifyJs
Unexpected token: operator (>) [./~/icepick/icepick.js:16,0][static/js/main.fd1459b7.js:11521,25]

error Command failed with exit code 1.

Alternatively, clone https://github.com/Psykar/test-icepick-uglify then yarn build and you'll also see it :)

[aearly]

Looks like CRA doesn't use a version of uglify that supports ES6 yet: facebook/create-react-app#2108

In the meantime, you can use icepick@^1, there are no new features in 2.0,

[Psykar]

So they're uglifying before transpiling. Weird. I guess this can be closed then, not an issue on your end (and yeah ^1 works fine =)