Gulp: Sass task is not defined after saving scss - sass

Question

I've been having a few issues trying to get Gulp working properly for a local Understrap Wordpress theme project I've been working on. I finally got it to a point where it will Start the "Watch" and "Default" processes, but then when I save my .scss files, I'm getting an error that says Error: task "sass" is not defined.
After that error, there are a number of other flags that mention sequencify, orchestrator, gulp-sequence, and thunks.
Below, I've included my gulpfile.js and the whole error code I'm receiving in terminal. I've been Googling for hours, and I can't seem to find a solution that fits into this scenario. I've tried rebuilding npm and uninstalling/reinstalling all my nodes, to no avail. Any help would be much appreciated!
My gulpfile.js
This is pretty much the standard file that comes with the Understrap theme.
// Defining requirements
var gulp = require( 'gulp' );
var plumber = require( 'gulp-plumber' );
var sass = require( 'gulp-sass' );
var watch = require( 'gulp-watch' );
var rename = require( 'gulp-rename' );
var concat = require( 'gulp-concat' );
var uglify = require( 'gulp-uglify' );
var imagemin = require( 'gulp-imagemin' );
var ignore = require( 'gulp-ignore' );
var rimraf = require( 'gulp-rimraf' );
var sourcemaps = require( 'gulp-sourcemaps' );
var browserSync = require( 'browser-sync' ).create();
var del = require( 'del' );
var cleanCSS = require( 'gulp-clean-css' );
var gulpSequence = require( 'gulp-sequence' );
var replace = require( 'gulp-replace' );
var autoprefixer = require( 'gulp-autoprefixer' );
// Configuration file to keep your code DRY
var cfg = require( './gulpconfig.json' );
var paths = cfg.paths;
// Load Gulp plugins from package dependencies
// var plugins = require('gulp-load-plugins')();
// Run:
// gulp sass
// Compiles SCSS files in CSS
gulp.task( 'sass', function() {
var stream = gulp.src( paths.sass + '/*.scss' )
.pipe( plumber( {
errorHandler: function( err ) {
console.log( err );
this.emit( 'end' );
}
} ) )
.pipe(sourcemaps.init({loadMaps: true}))
.pipe( sass( { errLogToConsole: true } ) )
.pipe( autoprefixer( 'last 2 versions' ) )
.pipe(sourcemaps.write(undefined, { sourceRoot: null }))
.pipe( gulp.dest( paths.css ) )
return stream;
});
// Run:
// gulp watch
// Starts watcher. Watcher runs gulp sass task on changes
gulp.task( 'watch', function() {
gulp.watch( paths.sass + '/**/*.scss', ['styles'] );
gulp.watch( [paths.dev + '/js/**/*.js', 'js/**/*.js', '!js/theme.js',
'!js/theme.min.js'], ['scripts'] );
//Inside the watch task.
gulp.watch( paths.imgsrc + '/**', ['imagemin-watch'] );
});
/**
* Ensures the 'imagemin' task is complete before reloading browsers
* #verbose
*/
gulp.task( 'imagemin-watch', ['imagemin'], function( ) {
browserSync.reload();
});
// Run:
// gulp imagemin
// Running image optimizing task
gulp.task( 'imagemin', function() {
gulp.src( paths.imgsrc + '/**' )
.pipe( imagemin() )
.pipe( gulp.dest( paths.img ) );
});
// Run:
// gulp cssnano
// Minifies CSS files
gulp.task( 'cssnano', function() {
return gulp.src( paths.css + '/theme.css' )
.pipe( sourcemaps.init( { loadMaps: true } ) )
.pipe( plumber( {
errorHandler: function( err ) {
console.log( err );
this.emit( 'end' );
}
} ) )
.pipe( rename( { suffix: '.min' } ) )
.pipe( cssnano( { discardComments: { removeAll: true } } ) )
.pipe( sourcemaps.write( './' ) )
.pipe( gulp.dest( paths.css ) );
});
gulp.task( 'minifycss', function() {
return gulp.src( paths.css + '/theme.css' )
.pipe( sourcemaps.init( { loadMaps: true } ) )
.pipe( cleanCSS( { compatibility: '*' } ) )
.pipe( plumber( {
errorHandler: function( err ) {
console.log( err ) ;
this.emit( 'end' );
}
} ) )
.pipe( rename( { suffix: '.min' } ) )
.pipe( sourcemaps.write( './' ) )
.pipe( gulp.dest( paths.css ) );
});
gulp.task( 'cleancss', function() {
return gulp.src( paths.css + '/*.min.css', { read: false } ) // Much faster
.pipe( ignore( 'theme.css' ) )
.pipe( rimraf() );
});
gulp.task( 'styles', function( callback ) {
gulpSequence( 'sass', 'minifycss' )( callback );
} );
// Run:
// gulp browser-sync
// Starts browser-sync task for starting the server.
gulp.task( 'browser-sync', function() {
browserSync.init( cfg.browserSyncWatchFiles, cfg.browserSyncOptions );
} );
// Run:
// gulp watch-bs
// Starts watcher with browser-sync. Browser-sync reloads page automatically on your browser
gulp.task( 'watch-bs', ['browser-sync', 'watch', 'scripts'], function() {
} );
// Run:
// gulp scripts.
// Uglifies and concat all JS files into one
gulp.task( 'scripts', function() {
var scripts = [
// Start - All BS4 stuff
paths.dev + '/js/bootstrap4/bootstrap.bundle.js',
// End - All BS4 stuff
paths.dev + '/js/skip-link-focus-fix.js',
// Adding currently empty javascript file to add on for your own themes´ customizations
// Please add any customizations to this .js file only!
paths.dev + '/js/custom-javascript.js'
];
gulp.src( scripts )
.pipe( concat( 'theme.min.js' ) )
.pipe( uglify() )
.pipe( gulp.dest( paths.js ) );
gulp.src( scripts )
.pipe( concat( 'theme.js' ) )
.pipe( gulp.dest( paths.js ) );
});
// Deleting any file inside the /src folder
gulp.task( 'clean-source', function() {
return del( ['src/**/*'] );
});
// Run:
// gulp copy-assets.
// Copy all needed dependency assets files from bower_component assets to themes /js, /scss and /fonts folder. Run this task after bower install or bower update
////////////////// All Bootstrap SASS Assets /////////////////////////
gulp.task( 'copy-assets', function() {
////////////////// All Bootstrap 4 Assets /////////////////////////
// Copy all JS files
var stream = gulp.src( paths.node + 'bootstrap/dist/js/**/*.js' )
.pipe( gulp.dest( paths.dev + '/js/bootstrap4' ) );
// Copy all Bootstrap SCSS files
gulp.src( paths.node + 'bootstrap/scss/**/*.scss' )
.pipe( gulp.dest( paths.dev + '/sass/bootstrap4' ) );
////////////////// End Bootstrap 4 Assets /////////////////////////
// Copy all Font Awesome Fonts
gulp.src( paths.node + 'font-awesome/fonts/**/*.{ttf,woff,woff2,eot,svg}' )
.pipe( gulp.dest( './fonts' ) );
// Copy all Font Awesome SCSS files
gulp.src( paths.node + 'font-awesome/scss/*.scss' )
.pipe( gulp.dest( paths.dev + '/sass/fontawesome' ) );
// _s SCSS files
gulp.src( paths.node + 'undescores-for-npm/sass/media/*.scss' )
.pipe( gulp.dest( paths.dev + '/sass/underscores' ) );
// _s JS files into /src/js
gulp.src( paths.node + 'undescores-for-npm/js/skip-link-focus-fix.js' )
.pipe( gulp.dest( paths.dev + '/js' ) );
});
// Deleting the files distributed by the copy-assets task
gulp.task( 'clean-vendor-assets', function() {
return del( [paths.dev + '/js/bootstrap4/**', paths.dev + '/sass/bootstrap4/**', './fonts/*wesome*.{ttf,woff,woff2,eot,svg}', paths.dev + '/sass/fontawesome/**', paths.dev + '/sass/underscores/**', paths.dev + '/js/skip-link-focus-fix.js', paths.js + '/**/skip-link-focus-fix.js', paths.js + '/**/popper.min.js', paths.js + '/**/popper.js', ( paths.vendor !== ''?( paths.js + paths.vendor + '/**' ):'' )] );
});
// Run
// gulp dist
// Copies the files to the /dist folder for distribution as simple theme
gulp.task( 'dist', ['clean-dist'], function() {
return gulp.src( ['**/*', '!' + paths.bower, '!' + paths.bower + '/**', '!' + paths.node, '!' + paths.node + '/**', '!' + paths.dev, '!' + paths.dev + '/**', '!' + paths.dist, '!' + paths.dist + '/**', '!' + paths.distprod, '!' + paths.distprod + '/**', '!' + paths.sass, '!' + paths.sass + '/**', '!readme.txt', '!readme.md', '!package.json', '!package-lock.json', '!gulpfile.js', '!gulpconfig.json', '!CHANGELOG.md', '!.travis.yml', '!jshintignore', '!codesniffer.ruleset.xml', '*'], { 'buffer': true } )
.pipe( replace( '/js/jquery.slim.min.js', '/js' + paths.vendor + '/jquery.slim.min.js', { 'skipBinary': true } ) )
.pipe( replace( '/js/popper.min.js', '/js' + paths.vendor + '/popper.min.js', { 'skipBinary': true } ) )
.pipe( replace( '/js/skip-link-focus-fix.js', '/js' + paths.vendor + '/skip-link-focus-fix.js', { 'skipBinary': true } ) )
.pipe( gulp.dest( paths.dist ) );
});
// Deleting any file inside the /dist folder
gulp.task( 'clean-dist', function() {
return del( [paths.dist + '/**'] );
});
// Run
// gulp dist-product
// Copies the files to the /dist-prod folder for distribution as theme with all assets
gulp.task( 'dist-product', ['clean-dist-product'], function() {
return gulp.src( ['**/*', '!' + paths.bower, '!' + paths.bower + '/**', '!' + paths.node, '!' + paths.node + '/**', '!' + paths.dist, '!' + paths.dist +'/**', '!' + paths.distprod, '!' + paths.distprod + '/**', '*'] )
.pipe( gulp.dest( paths.distprod ) );
} );
// Deleting any file inside the /dist-product folder
gulp.task( 'clean-dist-product', function() {
return del( [paths.distprod + '/**'] );
} );
// Run:
// gulp
// Starts watcher (default task)
gulp.task('default', ['watch']);
My terminal process and error message after saving my .scss files
arobinson$ gulp
[15:27:23] Using gulpfile /understrap-child/gulpfile.js
[15:27:23] Starting 'watch'...
[15:27:23] Finished 'watch' after 12 ms
[15:27:23] Starting 'default'...
[15:27:23] Finished 'default' after 21 μs
[15:27:35] Starting 'styles'...
[15:27:35] 'styles' errored after 171 ms
[15:27:35] Error: task "sass" is not defined
at Gulp.sequence (/Users/arobinson/node_modules/sequencify/index.js:14:9)
at Gulp.Orchestrator.start (/Users/arobinson/node_modules/orchestrator/index.js:115:9)
at /Users/arobinson/node_modules/gulp-sequence/index.js:66:12
at apply (/Users/arobinson/node_modules/thunks/index.js:354:38)
at tryRun (/Users/arobinson/node_modules/thunks/index.js:224:19)
at runThunk (/Users/arobinson/node_modules/thunks/index.js:217:15)
at /Users/arobinson/node_modules/thunks/index.js:314:49
at apply (/Users/arobinson/node_modules/thunks/index.js:354:38)
at tryRun (/Users/arobinson/node_modules/thunks/index.js:224:19)
at runThunk (/Users/arobinson/node_modules/thunks/index.js:217:15)

Answer 1

From the gulp-sequence docs:
gulpSequence.use(gulp)
return a new gulpSequence function with the gulp. If you have some
errors such as "task xxx is not defined", this will resolve it.
var gulpSequence = require('gulp-sequence').use(gulp)
So change to
var gulpSequence = require('gulp-sequence').use(gulp)
and see if that helps.