每次我运行任何东西,我得到一个断言错误. - 必须指定任务功能

Question

我正在尝试运行下面的命令,但不幸的是我遇到了错误.

$ gulp build

在我的终端,我得到这个断言错误.我已经卸载了节点和NPM并使用brew再次重新安装 - 如何完全卸载Node.js,并从头开始重新安装(Mac OS X).我的节点版本是v10.5.0,npm版本是6.1.0.

我的系统是MacOS High Sierra 10.13.2

assert.js:269
    throw err;
    ^

AssertionError [ERR_ASSERTION]: Task function must be specified
    at Gulp.set [as _setTask] (bulkit/startup-kit/node_modules/undertaker/lib/set-task.js:10:3)
    at Gulp.task (startup-kit/node_modules/undertaker/lib/task.js:13:8)
    at Object.<anonymous> 
    at Module._compile (internal/modules/cjs/loader.js:702:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:713:10)
    at Module.load (internal/modules/cjs/loader.js:612:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:551:12)
    at Function.Module._load (internal/modules/cjs/loader.js:543:3)
    at Module.require (internal/modules/cjs/loader.js:650:17)
    at require (internal/modules/cjs/helpers.js:20:18)

的package.json

{
    "name": "bulkit-startup",
    "version": "0.0.1",
    "description": "Bulkit Startup Kit",
    "main": "Gruntfile.js",
    "devDependencies": {
        "autoprefixer": "^6.3.6",
        "browser-sync": "^2.24.5",
        "gulp": "^4.0.0",
        "gulp-clean": "^0.3.2",
        "gulp-concat": "^2.6.0",
        "gulp-postcss": "^6.1.0",
        "gulp-sass": "^2.2.0",
        "gulp-sourcemaps": "^1.6.0",
        "jquery": "^3.3.1",
        "mq4-hover-shim": "^0.3.0",
        "panini": "^1.3.0",
        "rimraf": "^2.5.2"
    },
    "engines": {
        "node": ">=0.10.1"
    },
    "scripts": {
        "start": "gulp",
        "build": "gulp build"
    },
    "repository": {
        "type": "git",
        "url": "https://github.com/cssninjaStudio/bulkit.git"
    },
    "bugs": {
        "url": "https://github.com/cssninjaStudio/bulkit/issues",
        "email": "support@cssninja.io"
    },
    "author": "Css Ninja <hello@cssninja.io> (https://cssninja.io/themes/bulkit)",
    "license": "Commercial",
    "private": true,
    "dependencies": {
        "bulma": "^0.7.0",
        "del": "^3.0.0",
        "jquery-waypoints": "^2.0.5",
        "jquery.counterup": "^2.1.0",
        "scrollreveal": "^3.4.0",
        "slick-carousel": "^1.8.1",
        "wallop": "^2.4.1"
    }
}

gulpfile.js

var gulp = require('gulp');
var clean = require('gulp-clean');
var sass = require('gulp-sass');
var sourcemaps = require('gulp-sourcemaps');
var postcss = require('gulp-postcss');
var autoprefixer = require('autoprefixer');
var mq4HoverShim = require('mq4-hover-shim');
var rimraf = require('rimraf').sync;
var browser = require('browser-sync');
var panini = require('panini');
var concat = require('gulp-concat');
var port = process.env.SERVER_PORT || 8080;
var nodepath =  'node_modules/';
var assetspath =  'assets/';

// Starts a BrowerSync instance
gulp.task('server', ['build'], function(){
    browser.init({server: './_site', port: port});
});

// Watch files for changes
gulp.task('watch', function() {
    gulp.watch('scss/**/*', ['compile-scss', browser.reload]);
    gulp.watch('sass/**/*', ['compile-sass', browser.reload]);
    gulp.watch('js/**/*', ['copy-js', browser.reload]);
    gulp.watch('images/**/*', ['copy-images', browser.reload]);
    gulp.watch('html/pages/**/*', ['compile-html']);
    gulp.watch(['html/{layouts,includes,helpers,data}/**/*'], ['compile-html:reset','compile-html']);
    gulp.watch(['./src/{layouts,partials,helpers,data}/**/*'], [panini.refresh]);
});

// Erases the dist folder
gulp.task('reset', function() {
    rimraf('bulma/*');
    rimraf('scss/*');
    rimraf('assets/css/*');
    rimraf('assets/fonts/*');
    rimraf('images/*');
});

// Erases the dist folder
gulp.task('clean', function() {
    rimraf('_site');
});

// Copy Bulma filed into Bulma development folder
gulp.task('setupBulma', function() {
    //Get Bulma from node modules
    gulp.src([nodepath + 'bulma/*.sass']).pipe(gulp.dest('bulma/'));
    gulp.src([nodepath + 'bulma/**/*.sass']).pipe(gulp.dest('bulma/'));
});

// Copy static assets
gulp.task('copy', function() {
    //Copy other external font and data assets
    gulp.src(['assets/fonts/**/*']).pipe(gulp.dest('_site/assets/fonts/'));
    gulp.src([nodepath + 'slick-carousel/slick/fonts/**/*']).pipe(gulp.dest('_site/assets/css/fonts/'));
    gulp.src([nodepath + 'slick-carousel/slick/ajax-loader.gif']).pipe(gulp.dest('_site/assets/css/'));
});

//Theme Sass variables
var sassOptions = {
    errLogToConsole: true,
    outputStyle: 'compressed',
    includePaths: [nodepath + 'bulma/sass']
};

//Theme Scss variables
var scssOptions = {
    errLogToConsole: true,
    outputStyle: 'compressed',
    includePaths: ['./scss/partials']
};

// Compile Bulma Sass
gulp.task('compile-sass', function () {
    var processors = [
        mq4HoverShim.postprocessorFor({ hoverSelectorPrefix: '.is-true-hover ' }),
        autoprefixer({
            browsers: [
                "Chrome >= 45",
                "Firefox ESR",
                "Edge >= 12",
                "Explorer >= 10",
                "iOS >= 9",
                "Safari >= 9",
                "Android >= 4.4",
                "Opera >= 30"
            ]
        })//,
        //cssnano(),
    ];
    //Watch me get Sassy
    return gulp.src('./bulma/bulma.sass')
        .pipe(sourcemaps.init())
        .pipe(sass(sassOptions).on('error', sass.logError))
        .pipe(postcss(processors))
        .pipe(sourcemaps.write())
        .pipe(gulp.dest('./_site/assets/css/'));
});

// Compile Theme Scss
gulp.task('compile-scss', function () {
    var processors = [
        mq4HoverShim.postprocessorFor({ hoverSelectorPrefix: '.is-true-hover ' }),
        autoprefixer({
            browsers: [
                "Chrome >= 45",
                "Firefox ESR",
                "Edge >= 12",
                "Explorer >= 10",
                "iOS >= 9",
                "Safari >= 9",
                "Android >= 4.4",
                "Opera >= 30"
            ]
        })//,
        //cssnano(),
    ];
    //Watch me get Sassy
    return gulp.src('./scss/core.scss')
        .pipe(sourcemaps.init())
        .pipe(sass(sassOptions).on('error', sass.logError))
        .pipe(postcss(processors))
        .pipe(sourcemaps.write())
        .pipe(gulp.dest('./_site/assets/css/'));
});

// Compile Html
gulp.task('compile-html', function() {
    gulp.src('html/pages/**/*.html')
        .pipe(panini({
        root: 'html/pages/',
        layouts: 'html/layouts/',
        partials: 'html/includes/',
        helpers: 'html/helpers/',
        data: 'html/data/'
    }))
        .pipe(gulp.dest('_site'))
        .on('finish', browser.reload);
});

gulp.task('compile-html:reset', function(done) {
    panini.refresh();
    done();
});

// Compile css from node modules
gulp.task('compile-css', function() {
    return gulp.src([ 
        nodepath + 'slick-carousel/slick/slick.css',
        nodepath + 'slick-carousel/slick/slick-theme.css',
        nodepath + 'wallop/css/wallop.css',
        //Additional static css assets
        assetspath + 'css/icons.min.css',
    ])
        .pipe(concat('app.css'))
        .pipe(gulp.dest('./_site/assets/css/'));
});

// Compile js from node modules
gulp.task('compile-js', function() {
    return gulp.src([ 
        nodepath + 'jquery/dist/jquery.min.js', 
        nodepath + 'slick-carousel/slick/slick.min.js', 
        nodepath + 'scrollreveal/dist/scrollreveal.min.js',
        nodepath + 'waypoints/lib/jquery.waypoints.min.js',
        nodepath + 'waypoints/lib/shortcuts/sticky.min.js',
        nodepath + 'jquery.counterup/jquery.counterup.min.js',
        nodepath + 'wallop/js/Wallop.min.js',
        //Additional static js assets
        assetspath + 'js/ggpopover/ggpopover.min.js',
        assetspath + 'js/ggpopover/ggtooltip.js',
        assetspath + 'js/embed/embed.js',
        assetspath + 'js/gmap/gmap.min.js',
    ])
        .pipe(concat('app.js'))
        .pipe(gulp.dest('./_site/assets/js/'));
});

//Copy Theme js to production site
gulp.task('copy-js', function() {
    gulp.src('js/**/*.js')
        .pipe(gulp.dest('./_site/assets/js/'));
});

//Copy images to production site
gulp.task('copy-images', function() {
    gulp.src('images/**/*')
        .pipe(gulp.dest('./_site/assets/images/'));
});

gulp.task('init', ['setupBulma']);
gulp.task('build', ['clean','copy', 'compile-js', 'compile-css', 'copy-js', 'compile-sass', 'compile-scss', 'compile-html', 'copy-images']);
gulp.task('default', ['server', 'watch']);

Answer 1

如果任务依赖于另一个要执行的任务,Gulp 4.0已经改变了应该定义任务的方式.list参数已被弃用.

你的gulpfile.js的一个例子是:

// Starts a BrowerSync instance
gulp.task('server', ['build'], function(){
  browser.init({server: './_site', port: port});
});

而不是他们引入的列表参数gulp.series()和gulp.parallel().

此任务应更改为以下内容:

// Starts a BrowerSync instance
gulp.task('server', gulp.series('build', function(){
  browser.init({server: './_site', port: port});
}));

我不是这方面的专家.您可以在gulp文档中看到一个更强大的示例,用于连续运行任务或Jhey Thompkins撰写的这篇优秀博客文章.

https://codeburst.io/switching-to-gulp-4-0-271ae63530c0

Answer 2

将package.json文件中的gulp版本降低到3.9.1-

"gulp": "^3.9.1",

Answer 3

https://fettblog.eu/gulp-4-parallel-and-series/

因为 gulp.task(name, deps, func)被代替gulp.task(name, gulp.{series|parallel}(deps, func))。

您使用的是最新版本的gulp，但代码较旧。修改代码或降级。

Answer 4

使用 Gulp 时出现同样的错误。解决办法是切换到Gulp 3.9.1版本，本地版本和CLI版本都可以。

sudo npm install -g gulp@3.9.1

在项目文件夹中运行

npm install gulp@3.9.1

Answer 5

您无需将gulp从gulp 4降级。使用gulp.series（）组合多个任务。首先使用以下命令全局安装gulp

npm install --global gulp-cli

然后使用以下命令在您的工作目录上本地安装

npm install --save-dev gulp

在这里查看详细信息

例：

package.json

{
  "name": "gulp-test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "browser-sync": "^2.26.3",
    "gulp": "^4.0.0",
    "gulp-sass": "^4.0.2"
  },
  "dependencies": {
    "bootstrap": "^4.3.1",
    "jquery": "^3.3.1",
    "popper.js": "^1.14.7"
  }
}

gulpfile.js

var gulp = require("gulp");
var sass = require('gulp-sass');
var browserSync = require('browser-sync').create();

// Specific Task
function js() {
    return gulp
    .src(['node_modules/bootstrap/dist/js/bootstrap.min.js', 'node_modules/jquery/dist/jquery.min.js', 'node_modules/popper.js/dist/umd/popper.min.js'])
    .pipe(gulp.dest('src/js'))
    .pipe(browserSync.stream());
}
gulp.task(js);

// Specific Task
function gulpSass() {
    return gulp
    .src(['src/scss/*.scss'])
    .pipe(sass())
    .pipe(gulp.dest('src/css'))
    .pipe(browserSync.stream());
}
gulp.task(gulpSass);

// Run multiple tasks
gulp.task('start', gulp.series(js, gulpSass));

运行gulp start以触​​发多个任务并运行gulp js或gulp gulpSass执行特定任务。

Answer 6

尝试替换您的gulpfile.js的最后一行

gulp.task('default', ['server', 'watch']);

与

gulp.task('default', gulp.series('server', 'watch'));

Answer 7

问题是你使用的是 gulp 4 并且 gulfile.js 中的语法是 gulp 3。所以要么将你的 gulp 降级到 3.xx 要么使用 gulp 4 语法。

语法 Gulp 3：

gulp.task('default', ['sass'], function() {....} );

语法吞咽 4：

gulp.task('default', gulp.series(sass), function() {....} );

您可以在以下位置阅读有关 gulp 和 gulp 任务的更多信息：https : //medium.com/@sudoanushil/how-to-write-gulp-tasks-ce1b1b7a7e81

Answer 8

从 Gulp 3.x 迁移到 Gulp 4.x 时，我们遇到以下常见错误：

错误：

• AssertionError [ERR_ASSERTION]：必须指定任务函数
• 断言错误 [ERR_ASSERTION]：任务从未定义：
• 以下任务未完成：您是否忘记发出异步完成信号？

以下是关于任务定义和执行需要注意的几点：

1. 首先定义任务
2. 使用退货
3. 然后用 gulp.series() 执行

这是与 Gulp v4 一起使用的快速 Gulp 代码：

// First define task with Return
gulp.task('css-minify', function () {
    return gulp.src('assets/images/*.*')
        .pipe(smushit({verbose: true}))
        .pipe(gulp.dest('assets/images'));
});

// Then execute task with bracket '()' instead of '[]'
gulp.task('default', gulp.series('css-minify'));

Answer 9

将数组替换为：

gulp.task('default', ['task1', 'task2','task3']); 

与 gulp.series()

gulp.task('default', gulp.series('task1', 'task2','task3'));