If using browserify and package.json to indicate which transforms to be used (which is the most expedient transform method) you cannot use lessify because transforms do not apply across module boundaries.
Per the Browserify Handbook + node_modules Transforms DO NOT apply across module boundaries!
The workarounds are:
- Use alternative transform methods (spelling it out in command line, using task runner plugins, etc)
- Manually copying LESS files over.
- Overwriting react-select
package.json to include browserify transforms.
I have an aging pull request to fix this: #412