Update gulp-postcss to 5.0

[ai]

gulp-postcss 4.0 uses very old version of PostCSS and some of users have a problems

/cc @silvenon

[silvenon]

I couldn't get gulp-postcss v5.0.0 to work. I'm not sure if I'm doing anything wrong or it's just broken…

stream.js:94
      throw er; // Unhandled stream error in pipe.
            ^
ReferenceError: Promise is not defined
    at LazyResult.async (/Users/matija/Code/test/webapp/node_modules/gulp-postcss/node_modules/postcss/lib/lazy-result.js:93:31)
    at LazyResult.then (/Users/matija/Code/test/webapp/node_modules/gulp-postcss/node_modules/postcss/lib/lazy-result.js:56:21)
    at Transform.stream._transform (/Users/matija/Code/test/webapp/node_modules/gulp-postcss/index.js:44:10)
    at Transform._read (_stream_transform.js:179:10)
    at Transform._write (_stream_transform.js:167:12)
    at doWrite (_stream_writable.js:226:10)
    at writeOrBuffer (_stream_writable.js:216:5)
    at Transform.Writable.write (_stream_writable.js:183:11)
    at Stream.ondata (stream.js:51:26)
    at Stream.emit (events.js:95:17)

[ai]

Latest PostCSS uses Promises. But I saw that your package.json requires node.js >= 0.12, as I understand.

[ai]

I asked gulp-postcss author to add polyfill for old node.

[ai]

We fix gulp-postcss for node.js. PostCSS 4.1.3 now contains polyill.

[silvenon]

Thanks. So we need to add es6-promise to package.json as well, right?

[ai]

@silvenon nope, PostCSS 4.1.3 already has es6-promise in own dependencies.

[silvenon]

I think you accidentally added it to devDependencies instead of dependencies 😃

[ai]

@silvenon yeap :( wait a second

[ai]

Fix released in PostCSS 4.1.4.

[silvenon]

It works, thanks! 👍