Basic Gulpfile - Sass

gulpfile.js

var gulp = require('gulp'),
	sass = require('gulp-sass');

var sassConfig = {
	inputDirectory: 'resources/sass/**/*.scss',
	outputDirectory: 'assets/css',
	options: {
		outputStyle: 'expanded'
	}
}

gulp.task('build-css', function() {
	return gulp
		.src(sassOptions.inputDirectory)
		.pipe(sass(sassConfig.options).on('error', sass.logError))
		.pipe(gulp.dest(sassConfig.outputDirectory);
});

gulp.task('watch', function() {
	gulp.watch('resources/sass/**/*.scss', ['build-css']);
});

Thanks! This is great. Note missing final parens on line 16. Also I added a default task:

// Default Task
gulp.task('default', ['build-css']);

Line 14: should be sassConfig, not sassOptions.

Also charneykaye's comment is relevant.

Also, if you are running Gulp 4.x, you will want to change Line 20 to be something like:

gulp.watch('path/to/watch', gulp.series('build-css'))

Other than those small things, this is a very good base for a front-end newb like myself to get a gulpfile off the ground.