You must change the value of debugInfo to false from true to compass.server.options.debugInfo
compass: { options: { sassDir: '<%= yeoman.app %>/styles', cssDir: '.tmp/styles', generatedImagesDir: '.tmp/images/generated', imagesDir: '<%= yeoman.app %>/images', javascriptsDir: '<%= yeoman.app %>/scripts', fontsDir: '<%= yeoman.app %>/styles/fonts', importPath: '<%= yeoman.app %>/bower_components', httpImagesPath: '/images', httpGeneratedImagesPath: '/images/generated', httpFontsPath: '/styles/fonts', relativeAssets: false, assetCacheBuster: false, raw: 'Sass::Script::Number.precision = 10\n' }, dist: { options: { generatedImagesDir: '<%= yeoman.dist %>/images/generated' } }, server: { options: { //set degbugInfo false to produce css code without sass debugInfo debugInfo: false } } },
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