transition.js does es import on CommonJS files from css-in-js-utils breaking es module usage

[chrisirhc]

When using inline-style-prefixer as an ES module, the hyphenateProperty call in transition.js throws errors (obj is not a function) because the css-in-js/lib/* files are actually CommonJS modules.

Potential solutions:

• import from css-in-js instead of css-in-js/lib (Cons: this might impact tree-shaking in some bundlers)
• conditional exports in css-in-js https://nodejs.org/api/packages.html#conditional-exports

References:
https://nodejs.org/api/packages.html#dual-commonjses-module-packages

Related to:
babel/babel#12363

[chrisirhc]

Unable to reproduce. Seems like an esm.sh build issue. Will investigate more.