Javascript 为什么在'；服务'；任务

我最近将一个基于gulp3.x的gulp文件迁移到了4.x，为任务添加了gulp.series，为任务函数添加了异步函数

但当我开始吞咽服务时，它完成了“清洁”和“服务”任务，但没有启动服务器就退出了，并且没有显示任何消息

日志：

> videostream@2.0.0 start /root/VideoStream > gulp serve [01:47:05] Requiring external module babel-register [01:47:05] Using gulpfile ~/VideoStream/gulpfile.babel.js [01:47:05] Starting 'serve'... [01:47:05] Starting 'clean'... [01:47:05] Finished 'clean' after 5.31 ms [01:47:05] Finished 'serve' after 6.8 ms
root@iZa2d90eklkjfyzkilci2vZ:~/VideoStream# 因为我是nodejs的新手，我想不出是什么问题\

---

请帮助我

据我在文档中了解，

gulp.task（）

签名是

gulp.task（[taskName]，function）

。因此，它并不期待第三个论点。我相信您可以通过这样的重构来修复它（您还必须修复

nodemon

任务）：

此外，不建议按照注册任务并将其作为字符串传递给

series（）

。相反，请执行以下操作：

const gulp = require('gulp');
const gulpLoadPlugins = require('gulp-load-plugins');
const del = require('delete');
const path = require('path');
const runSequence = require('run-sequence');

const plugins = gulpLoadPlugins();

const paths = {
  js: ['./**/*.js', '!dist/**', '!node_modules/**', '!coverage/**'],
  nonJs: ['./package.json', './.gitignore', './.env', './services/fet_firebase.json'],
  tests: './server/tests/*.js'
};

// Clean up dist and coverage directory
function clean(done) {
  del.sync(['dist/**', 'dist/.*', 'coverage/**', '!dist', '!coverage']);
  done();
}

// Copy non-js files to dist
function copy(done) {
  gulp.src(paths.nonJs)
    .pipe(plugins.newer('dist'))
    .pipe(gulp.dest('dist'));
  done();
}

// Compile ES6 to ES5 and copy to dist
function babel(done) {
  gulp.src([...paths.js, '!gulpfile.babel.js'], { base: '.' })
    .pipe(plugins.newer('dist'))
    .pipe(plugins.sourcemaps.init())
    .pipe(plugins.babel())
    .pipe(plugins.sourcemaps.write('.', {
      includeContent: false,
      sourceRoot(file) {
        return path.relative(file.path, __dirname);
      }
    }))
    .pipe(gulp.dest('dist'));
  done();
}

// Start server with restart on file changes
function nodemon(done) {
  gulp.series(copy, babel)
  plugins.nodemon({
    script: path.join('dist', 'index.js'),
    ext: 'js',
    ignore: ['node_modules/**/*.js', 'dist/**/*.js'],
    tasks: ['copy', 'babel']
  });
  done();
}

// gulp serve for development
function serve(done) {
  gulp.series(clean, nodemon);
  done();
}

exports.clean = clean;
exports.copy = copy;
exports.babel = babel;
exports.serve = serve;
// default task: clean dist, compile js files and copy non-js files.
exports.default = gulp.series(clean, copy, babel);

---

获取错误：：SyntaxError:/root/VideoStream/gulpfile.babel.js:意外令牌（64:9）。。。。。。。函数default（done）我认为由于default是一个保留关键字，所以我将default改为defaultTask…现在我得到一个错误：-Task从未定义：serveI还在文件末尾添加了exports.default=defaultTask。但还是同一个错误，我也运行了“吞咽”任务，结果什么也没有返回

// gulp serve for development
gulp.task('serve', (done) => {
  gulp.series(['clean', 'nodemon']);
  done();
});

const gulp = require('gulp');
const gulpLoadPlugins = require('gulp-load-plugins');
const del = require('delete');
const path = require('path');
const runSequence = require('run-sequence');

const plugins = gulpLoadPlugins();

const paths = {
  js: ['./**/*.js', '!dist/**', '!node_modules/**', '!coverage/**'],
  nonJs: ['./package.json', './.gitignore', './.env', './services/fet_firebase.json'],
  tests: './server/tests/*.js'
};

// Clean up dist and coverage directory
function clean(done) {
  del.sync(['dist/**', 'dist/.*', 'coverage/**', '!dist', '!coverage']);
  done();
}

// Copy non-js files to dist
function copy(done) {
  gulp.src(paths.nonJs)
    .pipe(plugins.newer('dist'))
    .pipe(gulp.dest('dist'));
  done();
}

// Compile ES6 to ES5 and copy to dist
function babel(done) {
  gulp.src([...paths.js, '!gulpfile.babel.js'], { base: '.' })
    .pipe(plugins.newer('dist'))
    .pipe(plugins.sourcemaps.init())
    .pipe(plugins.babel())
    .pipe(plugins.sourcemaps.write('.', {
      includeContent: false,
      sourceRoot(file) {
        return path.relative(file.path, __dirname);
      }
    }))
    .pipe(gulp.dest('dist'));
  done();
}

// Start server with restart on file changes
function nodemon(done) {
  gulp.series(copy, babel)
  plugins.nodemon({
    script: path.join('dist', 'index.js'),
    ext: 'js',
    ignore: ['node_modules/**/*.js', 'dist/**/*.js'],
    tasks: ['copy', 'babel']
  });
  done();
}

// gulp serve for development
function serve(done) {
  gulp.series(clean, nodemon);
  done();
}

exports.clean = clean;
exports.copy = copy;
exports.babel = babel;
exports.serve = serve;
// default task: clean dist, compile js files and copy non-js files.
exports.default = gulp.series(clean, copy, babel);