打包scss时报错：Task never defined

Task never defined: scss - did you mean? sass，任务没有定义？？？

本地代码：

const gulp = require('gulp');

const sass = require('gulp-sass')

const minifyCSS = require('gulp-minify-css');

gulp.task('sass', async function()

  return gulp.src('components/css/**/*.scss')

    .pipe(sass())

    .pipe(minifyCSS())

    .pipe(gulp.dest('dist/css'))

})