Javascript 咕噜咕噜-；您是否忘记发出异步完成的信号；从uglifyjs切换到terser后

我知道在这方面已经有很多问题了，但我之所以发帖，是因为在我从UglifyJS改为Terser之前，一切都很顺利，因为我希望能够压缩ES6代码

我返回流并在相关的地方使用

done（）

，但是在命令行上运行

gulp

时，我遇到了这个错误

这里是我使用简洁的相关部分：

var terser_options = {
    compress: {
        keep_fnames: true
    },
    mangle: false,
    keep_classnames: true,
    keep_fnames: true
};

gulp.task('uglify', gulp.series('scripts', function() {

    let stream;

    for (const bundle of bundleFolders) {

        // Get just the last directory of 'js/dev/bootstrap', 'js/dev/lib`, etc.
        let thisBundle = path.basename(bundle);

        if (thisBundle === 'bootstrap') {

            stream = merge2(

                gulp.src(bootstrap_files)
                    .pipe(terser(terser_options))
                    .pipe(concat(thisBundle + '.min.js'))
                    .pipe(gulp.dest('./js'))

            );

        } else {

            stream = gulp.src(bundle + "**/*.js")
                .pipe(gulpif('!**/*.min.js', terser(terser_options)))
                .pipe(concat(thisBundle + '.min.js'))
                .pipe(gulp.dest('./js'));

        }

    }

    return stream;

}));

var bootstrap_files = [
    // We have to set the bootstrap lines separately as some need to go before others
    'js/dev/bootstrap/alert.js',
    'js/dev/bootstrap/collapse.js',
    'js/dev/bootstrap/tooltip.js',
    'js/dev/bootstrap/popover.js',
    'js/dev/bootstrap/tab.js',
    'js/dev/bootstrap/transition.js'
];

const bundleFolders = glob.sync('js/dev/*/'); // returns an array of folders

var terser_options = {
    compress: {
        keep_fnames: true
    },
    mangle: false,
    keep_classnames: true,
    keep_fnames: true
};

gulp.task('scripts', () => {

    let stream;

    for (const bundle of bundleFolders) {

        // Get just the last directory of 'js/dev/bootstrap', 'js/dev/lib`, etc.
        let thisBundle = path.basename(bundle);

        if (thisBundle === 'bootstrap') {

            stream = merge2(

                gulp.src(bootstrap_files)
                    .pipe(sourcemaps.init())
                    .pipe(concat(thisBundle + '.js'))
                    .pipe(sourcemaps.write('../maps'))
                    .pipe(gulp.dest('./js'))

            );

        } else {

            stream = gulp.src(bundle + "**/*.js")
                .pipe(sourcemaps.init())
                .pipe(concat(thisBundle + '.js'))
                .pipe(sourcemaps.write('../maps'))
                .pipe(gulp.dest('./js'));

        }

    }

    return stream;

});

gulp.task('uglify', gulp.series('scripts', function() {

    let stream;

    for (const bundle of bundleFolders) {

        // Get just the last directory of 'js/dev/bootstrap', 'js/dev/lib`, etc.
        let thisBundle = path.basename(bundle);

        if (thisBundle === 'bootstrap') {

            stream = merge2(

                gulp.src(bootstrap_files)
                    .pipe(terser(terser_options))
                    .pipe(concat(thisBundle + '.min.js'))
                    .pipe(gulp.dest('./js'))

            );

        } else {

            stream = gulp.src(bundle + "**/*.js")
                .pipe(gulpif('!**/*.min.js', terser(terser_options)))
                .pipe(concat(thisBundle + '.min.js'))
                .pipe(gulp.dest('./js'));

        }

    }

    return stream;

}));

// create a task that ensures the `uglify` task is complete before
// reloading browsers
gulp.task('js-watch', gulp.series('uglify', function (done) {
    browserSync.reload();
    done();
}));

/* Creates the standard version */

gulp.task('styles', function() {
    return gulp.src('scss/**/*.scss')
        .pipe(sourcemaps.init())
            .pipe(sass().on('error', sass.logError))
        .pipe(sourcemaps.write('../maps'))
        .pipe(gulp.dest('./css/'))
        .pipe(browserSync.stream());
});

/* Creates the minified version */

gulp.task('css-minify', gulp.series('styles', function() {
    return gulp.src('scss/**/*.scss')
        .pipe(sourcemaps.init())
            .pipe(sass({
                outputStyle: 'compact' // Options: nested, expanded, compact, compressed
            }).on('error', sass.logError))
            .pipe(postcss([
                autoprefixer({
                    cascade: false
                }),
            ]))
            .pipe(cleanCSS({
                advanced: false,
                aggressiveMerging: false
            }))
            .pipe(rename({suffix: '.min'}))
        .pipe(sourcemaps.write('../maps'))
        .pipe(gulp.dest('./css/'));
}));

gulp.task('browser-sync', function(done) {
    browserSync.init({
        open: 'external',
        proxy: site_url,
        host: site_url,
        // port: 5000,
        browser: "chrome",
    });
    done();
});

gulp.task('watch', gulp.series('browser-sync', function() {
    gulp.watch('scss/**/*.scss', gulp.series('css-minify'));
    gulp.watch('js/dev/**/*.js', gulp.series('js-watch'));
}));

gulp.task('default', gulp.series('js-watch', 'css-minify'));

以下是大部分代码：

var terser_options = {
    compress: {
        keep_fnames: true
    },
    mangle: false,
    keep_classnames: true,
    keep_fnames: true
};

gulp.task('uglify', gulp.series('scripts', function() {

    let stream;

    for (const bundle of bundleFolders) {

        // Get just the last directory of 'js/dev/bootstrap', 'js/dev/lib`, etc.
        let thisBundle = path.basename(bundle);

        if (thisBundle === 'bootstrap') {

            stream = merge2(

                gulp.src(bootstrap_files)
                    .pipe(terser(terser_options))
                    .pipe(concat(thisBundle + '.min.js'))
                    .pipe(gulp.dest('./js'))

            );

        } else {

            stream = gulp.src(bundle + "**/*.js")
                .pipe(gulpif('!**/*.min.js', terser(terser_options)))
                .pipe(concat(thisBundle + '.min.js'))
                .pipe(gulp.dest('./js'));

        }

    }

    return stream;

}));

var bootstrap_files = [
    // We have to set the bootstrap lines separately as some need to go before others
    'js/dev/bootstrap/alert.js',
    'js/dev/bootstrap/collapse.js',
    'js/dev/bootstrap/tooltip.js',
    'js/dev/bootstrap/popover.js',
    'js/dev/bootstrap/tab.js',
    'js/dev/bootstrap/transition.js'
];

const bundleFolders = glob.sync('js/dev/*/'); // returns an array of folders

var terser_options = {
    compress: {
        keep_fnames: true
    },
    mangle: false,
    keep_classnames: true,
    keep_fnames: true
};

gulp.task('scripts', () => {

    let stream;

    for (const bundle of bundleFolders) {

        // Get just the last directory of 'js/dev/bootstrap', 'js/dev/lib`, etc.
        let thisBundle = path.basename(bundle);

        if (thisBundle === 'bootstrap') {

            stream = merge2(

                gulp.src(bootstrap_files)
                    .pipe(sourcemaps.init())
                    .pipe(concat(thisBundle + '.js'))
                    .pipe(sourcemaps.write('../maps'))
                    .pipe(gulp.dest('./js'))

            );

        } else {

            stream = gulp.src(bundle + "**/*.js")
                .pipe(sourcemaps.init())
                .pipe(concat(thisBundle + '.js'))
                .pipe(sourcemaps.write('../maps'))
                .pipe(gulp.dest('./js'));

        }

    }

    return stream;

});

gulp.task('uglify', gulp.series('scripts', function() {

    let stream;

    for (const bundle of bundleFolders) {

        // Get just the last directory of 'js/dev/bootstrap', 'js/dev/lib`, etc.
        let thisBundle = path.basename(bundle);

        if (thisBundle === 'bootstrap') {

            stream = merge2(

                gulp.src(bootstrap_files)
                    .pipe(terser(terser_options))
                    .pipe(concat(thisBundle + '.min.js'))
                    .pipe(gulp.dest('./js'))

            );

        } else {

            stream = gulp.src(bundle + "**/*.js")
                .pipe(gulpif('!**/*.min.js', terser(terser_options)))
                .pipe(concat(thisBundle + '.min.js'))
                .pipe(gulp.dest('./js'));

        }

    }

    return stream;

}));

// create a task that ensures the `uglify` task is complete before
// reloading browsers
gulp.task('js-watch', gulp.series('uglify', function (done) {
    browserSync.reload();
    done();
}));

/* Creates the standard version */

gulp.task('styles', function() {
    return gulp.src('scss/**/*.scss')
        .pipe(sourcemaps.init())
            .pipe(sass().on('error', sass.logError))
        .pipe(sourcemaps.write('../maps'))
        .pipe(gulp.dest('./css/'))
        .pipe(browserSync.stream());
});

/* Creates the minified version */

gulp.task('css-minify', gulp.series('styles', function() {
    return gulp.src('scss/**/*.scss')
        .pipe(sourcemaps.init())
            .pipe(sass({
                outputStyle: 'compact' // Options: nested, expanded, compact, compressed
            }).on('error', sass.logError))
            .pipe(postcss([
                autoprefixer({
                    cascade: false
                }),
            ]))
            .pipe(cleanCSS({
                advanced: false,
                aggressiveMerging: false
            }))
            .pipe(rename({suffix: '.min'}))
        .pipe(sourcemaps.write('../maps'))
        .pipe(gulp.dest('./css/'));
}));

gulp.task('browser-sync', function(done) {
    browserSync.init({
        open: 'external',
        proxy: site_url,
        host: site_url,
        // port: 5000,
        browser: "chrome",
    });
    done();
});

gulp.task('watch', gulp.series('browser-sync', function() {
    gulp.watch('scss/**/*.scss', gulp.series('css-minify'));
    gulp.watch('js/dev/**/*.js', gulp.series('js-watch'));
}));

gulp.task('default', gulp.series('js-watch', 'css-minify'));

编辑：我在添加terser时也安装了

npm

，因此它可能已经更新了gulp，但我已经使用4.*有一段时间了，特别是这是我的软件包的版本行。json:

^4.0.2

编辑2:似乎

4.0.2

仍然是最新版本，并且至少一年没有更新，因此我仍然使用同一版本的Gulp

Edit3:我刚刚更新了另一个项目中的

gulp.js

文件，使其使用更简洁，而且似乎效果很好。

gulp.js

文件完全相同

---

这里的问题是什么？

好的，奇怪的一个，但解决了问题

不确定为什么会发生这种情况，但它似乎有问题，并给出了这个错误，因为我的

js/dev

目录是空的

我不确定这些文件是如何被删除的，但幸运的是我能够恢复它们，但最终这并不是一条非常有用的错误消息

如果您收到此错误，并且它似乎不是由于错误消息所述的原因，请检查您的源目录/文件是否实际存在

---

现在它工作正常。

您在哪里/何时收到错误？@ChrisYungmann我在尝试在命令行上运行

gulp

时收到错误；我也用一个新发现更新了这篇文章。