迁移Gulp 4.0错误

Question

我在Gulp 4.0中进行迁移时遇到问题，请尝试对其进行更新，但仍然看到错误。

口香糖 assert.js：339     犯错     ^

AssertionError [ERR_ASSERTION]：从未定义任务：tocss

我正在尝试编辑代码以移植到版本4.0，但是仍然收到错误消息，未定义变量tocss，但是如果我在gulpfile.js中安装并定义了依赖项，则该错误

我复制了所有代码，以便您可以帮助我正确构建代码。

var gulp = require('gulp'),
    plumber = require('gulp-plumber'),
    debug = require('gulp-debug'),
    htmlmin = require('gulp-htmlmin'),
    map = require('gulp-sitemap'),
    jsmin = require('gulp-uglify-es').default,
    tocss = require('gulp-scss'),
    cssmin = require('gulp-cleancss'),
    imagemin = require('gulp-imagemin');

gulp.task('mini', gulp.parallel('htmlmin', 'jsmin', 'imagemin', gulp.series('tocss', 'cssmin')));
gulp.task('all', gulp.series('map'));

gulp.task('default', gulp.series(gulp.parallel('mini','all'), 'watch'));

gulp.task('htmlmin', () => {
    return gulp.src('*.html')
    .pipe(plumber())
    .pipe(htmlmin({collapseWhitespace: true}))
    .pipe(debug({verbose: true}))
    .pipe(gulp.dest('html_min/'));
});

gulp.task('map', () => {
    return gulp.src('*.html', {
        read: false
    })
    .pipe(plumber())
    .pipe(map({
        siteUrl: 'http://www.donamadorperu.com'
    }))
    .pipe(debug({verbose: true}))
    .pipe(gulp.dest(''));
});

gulp.task('jsmin', () => {
    return gulp.src('js/*.js')
    .pipe(plumber())
    .pipe(jsmin())
    .pipe(debug({verbose: true}))
    .pipe(gulp.dest('js/min/'));
});

gulp.task('tocss', () => {
    return gulp.src('scss/*.scss')
    .pipe(plumber())
    .pipe(tocss())
    .pipe(debug({verbose: true}))
    .pipe(gulp.dest('css/'));
});

gulp.task('cssmin', () => {
    return gulp.src('css/*.css')
    .pipe(plumber())
    .pipe(cssmin())
    .pipe(debug({verbose: true}))
    .pipe(gulp.dest('css/min/'));
});

gulp.task('imagemin', () => {
    return gulp.src('img/*.{jpg,jpeg,png,gif}')
    .pipe(plumber())
    .pipe(imagemin())
    .pipe(debug({verbose: true}))
    .pipe(gulp.dest('img/img_min/'));
});

gulp.task('watch', () => {
    gulp.watch('*.html', gulp.series('htmlmin'));
    gulp.watch('*.html', gulp.series('map'));
    gulp.watch('js/*.js', gulp.series('jsmin'));
    gulp.watch('scss/*.scss', gulp.series('tocss'));
    gulp.watch('css/*.css', gulp.series('cssmin'));
    gulp.watch('img/*.{jpg,jpeg,png,gif}', gulp.series('imagemin'));
});

我希望社区能够帮助我，我发现了更新的惊喜