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I am trying to minify my code and i always get this error when it runs clean-css. 

/home/k1ngsley/Projects/mobile_rea/partners-mobile-app/node_modules/clean-css/lib/selectors/extractor.js:66
  return name.replace(/^\-\w+\-/, '').match(/([a-zA-Z]+)/)[0].toLowerCase();
                                                          ^
TypeError: Cannot read property '0' of null
    at findNameRoot (/home/k1ngsley/Projects/mobile_rea/partners-mobile-app/node_modules/clean-css/lib/selectors/extractor.js:66:59)
    at extract (/home/k1ngsley/Projects/mobile_rea/partners-mobile-app/node_modules/clean-css/lib/selectors/extractor.js:36:9)
    at restructure (/home/k1ngsley/Projects/mobile_rea/partners-mobile-app/node_modules/clean-css/lib/selectors/restructure.js:297:22)
    at optimize (/home/k1ngsley/Projects/mobile_rea/partners-mobile-app/node_modules/clean-css/lib/selectors/advanced.js:71:5)
    at minify (/home/k1ngsley/Projects/mobile_rea/partners-mobile-app/node_modules/clean-css/lib/clean.js:228:5)
    at whenSourceMapReady (/home/k1ngsley/Projects/mobile_rea/partners-mobile-app/node_modules/clean-css/lib/clean.js:135:7)
    at Object.whenDone (/home/k1ngsley/Projects/mobile_rea/partners-mobile-app/node_modules/clean-css/lib/clean.js:155:14)
    at processNext (/home/k1ngsley/Projects/mobile_rea/partners-mobile-app/node_modules/clean-css/lib/imports/inliner.js:105:13)
    at importFrom (/home/k1ngsley/Projects/mobile_rea/partners-mobile-app/node_modules/clean-css/lib/imports/inliner.js:79:10)
    at ImportInliner.process (/home/k1ngsley/Projects/mobile_rea/partners-mobile-app/node_modules/clean-css/lib/imports/inliner.js:38:10)
Error: Hook failed with error code 8: /home/k1ngsley/Projects/mobile_rea/partners-mobile-app/hooks/after_prepare/070_uglify.js
    at /home/k1ngsley/npm/lib/node_modules/cordova/node_modules/cordova-lib/src/hooks/HooksRunner.js:195:23
    at _rejected (/home/k1ngsley/npm/lib/node_modules/cordova/node_modules/q/q.js:797:24)
    at /home/k1ngsley/npm/lib/node_modules/cordova/node_modules/q/q.js:823:30
    at Promise.when (/home/k1ngsley/npm/lib/node_modules/cordova/node_modules/q/q.js:1035:31)
    at Promise.promise.promiseDispatch (/home/k1ngsley/npm/lib/node_modules/cordova/node_modules/q/q.js:741:41)
    at /home/k1ngsley/npm/lib/node_modules/cordova/node_modules/q/q.js:557:44
    at flush (/home/k1ngsley/npm/lib/node_modules/cordova/node_modules/q/q.js:108:17)
    at process._tickCallback (node.js:448:13)

I have read different posts that says remove commented lines etc but all hasnt worked out for me.

Any one has any other ideas or ways to solve this issue

scniro
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Kingsley Simon
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  • FYI gulp-minify-css has been [deprecated](https://www.npmjs.com/package/gulp-minify-css) in favor of [gulp-clean-css](https://github.com/scniro/gulp-clean-css) – scniro Mar 02 '16 at 00:51
  • @Kingsley Simon: I`m having same problem now can you please tell me how did you resolve it? aprreciated! – shireef khatab Dec 19 '16 at 21:07
  • @shireefkhatab have u solved this? – Kingsley Simon Jan 15 '17 at 15:07
  • sorry, i had to change my code and use useref insrtead /* useref */ gulp.task('useref', ['clean'], function(){ return gulp.src(paths.html) .pipe(useref()) .pipe(gulpIf('*.html',htmlmin({collapseWhitespace: true}))) .pipe(gulpIf('*.js', uglify(), jshint() )) .pipe(gulpIf('*.css', cssnano() )) .pipe(gulp.dest('dist')) }); – shireef khatab Jan 24 '17 at 15:13
  • You should answer you own question if you solved the issue yourself. Having a similar error now and not quite sure how you said you solved it now.. – rhand May 24 '17 at 12:16

1 Answers1

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Take a look at min.css utility that is more fastest and fault-tolerance.

w3core
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