Error at installation: plugins is not defined

[SubstanceDesign]

Please, say me, what i do don't true?

gulpfile.js:

var sugarss = require('sugarss');
var postcss = require('gulp-postcss');
var rename = require('gulp-rename');
var autoprefixer = require('autoprefixer');
var cssnano = require('cssnano');

38 gulp.task('style', function () {
39 return gulp.src('build/templates/*.sss')
40 .pipe(postcss(plugins, { parser: sugarss }))
41 .pipe(rename({ extname: '.css' }))
42 .pipe(gulp.dest('app/templates/'));
43 });

Error:

ReferenceError: plugins is not defined
at Gulp. (/Users/user/Documents/Project/gulpfile.js:40:23)
at module.exports (/Users/user/node_modules/orchestrator/lib/runTask.js:34:7)
at Gulp.Orchestrator._runTask (/Users/user/node_modules/orchestrator/index.js:273:3)
at Gulp.Orchestrator._runStep (/Users/user/node_modules/orchestrator/index.js:214:10)
at Gulp.Orchestrator.start (/Users/user/node_modules/orchestrator/index.js:134:8)
at /usr/local/lib/node_modules/gulp-cli/lib/versioned/^3.7.0/index.js:46:20
at _combinedTickCallback (internal/process/next_tick.js:67:7)
at process._tickCallback (internal/process/next_tick.js:98:9)
at Function.Module.runMain (module.js:577:11)
at startup (node.js:160:18)

[ai]

You didn't create a plugins variable.

[SubstanceDesign]

I do not know, what must be in 'plugins' variable. I am beginner and don't found this answer in manual https://github.com/postcss/sugarss

May be you tell me?

[ai]

It is a variable with PostCSS plugins.

Replace plugins to [].

[SubstanceDesign]

Thanks a lot!