postcss-transform-classes npm install --save postcss-transform-classes Transforms all classes in a CSS file. import { camelCase } from 'lodash';import transformClasses from 'postcss-transform-classes'; return postcss([ transformClasses({ transform: camelCase, }),]) .process(...) By default will throw if two different classes produce the same output. In the example above, an error would be thrown if you had .foo-bar and .fooBar. You can disable this by setting allowConflicts: true.