Values parser

[jacobp100]

This is a refactor to use postcss-value-parser. This makes it easier to follow spec, and gives a perf boost. In addition, it will probably be easier for people to contribute.

This has all the v2 breaking changes:

• Require pixel units for lengths
• Quotes font family prop.

[mxstbr]

FYI, we're switching to stylis.js for the web version of styled-components in v2. No idea what we'll do with ReactNative... (see styled-components/styled-components#286)

[mxstbr]

LGTM

[jacobp100]

Not too sure there, it looks like we might have to use postCSS on Native so we can get the styles as an object.

For this branch, should be publish it so people can test regressions? If we do that, what’s best? A 2.0.0-pre version, or just 2.0.0?

Also, depending on the v2 timescale, we may want to consider a codemod for the breaking changes.

[mxstbr]

For this branch, should be publish it so people can test regressions? If we do that, what’s best? A 2.0.0-pre version, or just 2.0.0?

Yes let's publish 2.0.0 of css-to-react-native, and submit a PR to the main repo to upgrade it to that version on the v2 branch.

Also, depending on the v2 timescale, we may want to consider a codemod for the breaking changes.

Have you ever done that before? I'd love to have one, that's for sure!