Cleanup template declarations

[real-alexei]

We should nullify template literal declarations in order to be properly minified (by purifycss for example). So the following Babel/Buble-transpiled code:

var templateObject = _taggedTemplateLiteral['body { color: green; }']),
    templateObject2 = _taggedTemplateLiteral(['body { color: yellow; }']),
    templateObject3 = _taggedTemplateLiteral(['this is something else']);

Will be:

var __,
    __,
    templateObject3 = _taggedTemplateLiteral(['this is something else']);

[real-alexei]

@goto-bus-stop I'm gonna add TypeScript support right after this.

[real-alexei]

Reworked with proper variable declaration cleanup.

[goto-bus-stop]

this looks nice overall! Thanks for working on it and I'm sorry it took a long time to get to reviewing.

I think the hardcoded offsets (the -6 and +1 you commented on) are potentially brittle. If some other transform is in between Babel and sheetify those offsets may not be quite right.

I think a better approach is to remove a range from the start of one declarator until the start of the next declarator. That'll even work for weird things like var a = 0, /* lol */ c = 2 because the c declarator's range only starts at the letter c. I implemented something similar in static-module: https://github.com/browserify/static-module/blob/08da9185f26b586dd4e83de1c7a0a514d2980e2a/index.js#L75-L96

Everything else LGTM!

[real-alexei]

@goto-bus-stop Should be better now.

[real-alexei]

@goto-bus-stop Build failed due to recent update in third-parties: https://github.com/chalk/supports-color/blame/master/index.js#L5

We should move to Node 6 probably?

[goto-bus-stop]

excellent work, thanks!

since it's only a dev dependency, i don't think we need to drop node 6, which would require a major version bump. i'll see if we can pin the dependency to an older version somehow that will work on node 4.