└───css-modulesify-test
 ├───border.css
 ├───gulpfile.js
 ├───index.js
 ├───package.json
 └───style.css

{
 "name": "css-modulesify-test",
 "version": "1.0.0",
 "description": "",
 "main": "index.js",
 "scripts": {
 "test": "echo \"Error: no test specified\" && exit 1"
 },
 "author": "",
 "license": "ISC",
 "devDependencies": {
 "browserify": "^13.3.0",
 "css-modulesify": "css-modules/css-modulesify#fix-windows-abs-path",
 "gulp": "^3.9.1"
 }
}

const browserify = require('browserify');
const cssModules = require('css-modulesify');
const gulp = require('gulp');
gulp.task('default', () => {
 browserify({
 entries: './index.js',
 debug: true,
 })
 .plugin(cssModules, {
 output: './modules.css',
 })
 .bundle()
 .pipe(gulp.dest('./bundle.js'));
});

const styles = require('./style.css');
console.log(styles.normal);

.normal {
 composes: greyBottom from './border.css';
}

.greyBottom {
 border-bottom: 1px solid #C8C8C8;
}

C:\dev\js\css-modulesify-test>gulp
[09:13:44] Using gulpfile C:\dev\js\css-modulesify-test\gulpfile.js
[09:13:44] Starting 'default'...
[09:13:44] Finished 'default' after 14 ms
NO NODE C:\dev\js\css-modulesify-test\C:\C:\style.css C:\dev\js\css-modulesify-test\C:\C:\border.css
Error: Node does not exist: C:\dev\js\css-modulesify-test\C:\C:\style.css
 at Object.DepGraph.addDependency (C:\dev\js\css-modulesify-test\node_modules\dependency-graph\lib\dep_graph.js:87:13)
 at C:\dev\js\css-modulesify-test\node_modules\css-modulesify\file-system-loader.js:102:22
 at FileSystemLoader.fetch (C:\dev\js\css-modulesify-test\node_modules\css-modulesify\file-system-loader.js:65:14)
 at Parser.fetchImport (C:\dev\js\css-modulesify-test\node_modules\css-modules-loader-core\lib\parser.js:90:19)
 at C:\dev\js\css-modulesify-test\node_modules\css-modules-loader-core\lib\parser.js:49:31
 at Root.each (C:\dev\js\css-modulesify-test\node_modules\postcss\lib\container.js:110:22)
 at Parser.fetchAllImports (C:\dev\js\css-modulesify-test\node_modules\css-modules-loader-core\lib\parser.js:47:11)
 at Parser.plugin (C:\dev\js\css-modulesify-test\node_modules\css-modules-loader-core\lib\parser.js:35:31)
 at LazyResult.run (C:\dev\js\css-modulesify-test\node_modules\postcss\lib\lazy-result.js:270:20)
 at LazyResult.asyncTick (C:\dev\js\css-modulesify-test\node_modules\postcss\lib\lazy-result.js:185:32)
path.js:7
 throw new TypeError('Path must be a string. Received ' + inspect(path));
 ^
TypeError: Path must be a string. Received undefined
 at assertPath (path.js:7:11)
 at Object.resolve (path.js:184:7)
 at DestroyableTransform.saveFile [as _transform] (C:\dev\js\css-modulesify-test\node_modules\vinyl-fs\lib\dest\index.js:36:26)
 at DestroyableTransform.Transform._read (C:\dev\js\css-modulesify-test\node_modules\vinyl-fs\node_modules\readable-stream\lib\_stream_transform.js:184:10)
 at DestroyableTransform.Transform._write (C:\dev\js\css-modulesify-test\node_modules\vinyl-fs\node_modules\readable-stream\lib\_stream_transform.js:172:12)
 at doWrite (C:\dev\js\css-modulesify-test\node_modules\vinyl-fs\node_modules\readable-stream\lib\_stream_writable.js:237:10)
 at writeOrBuffer (C:\dev\js\css-modulesify-test\node_modules\vinyl-fs\node_modules\readable-stream\lib\_stream_writable.js:227:5)
 at DestroyableTransform.Writable.write (C:\dev\js\css-modulesify-test\node_modules\vinyl-fs\node_modules\readable-stream\lib\_stream_writable.js:194:11)
 at Readable.ondata (C:\dev\js\css-modulesify-test\node_modules\readable-stream\lib\_stream_readable.js:612:20)
 at emitOne (events.js:96:13)