我有以下gulpfile.js，我通过命令行gulp消息执行:
var gulp = require('gulp');
gulp.task('message', function() {
console.log("HTTP Server Started");
});
我得到以下错误消息:
[14:14:41] Using gulpfile ~\Documents\node\first\gulpfile.js
[14:14:41] Starting 'message'...
HTTP Server Started
[14:14:41] The following tasks did not complete: message
[14:14:41] Did you forget to signal async completion?
我在Windows 10系统上使用gulp 4。下面是gulp——version的输出:
[14:15:15] CLI version 0.4.0
[14:15:15] Local version 4.0.0-alpha.2
当前回答
我得到了同样的错误试图运行一个非常简单的SASS/CSS构建。
我的解决方案(可以解决相同或类似的错误)是简单地添加done作为默认任务函数的参数，并在默认任务的末尾调用它:
// Sass configuration
var gulp = require('gulp');
var sass = require('gulp-sass');
gulp.task('sass', function () {
gulp.src('*.scss')
.pipe(sass())
.pipe(gulp.dest(function (f) {
return f.base;
}))
});
gulp.task('clean', function() {
})
gulp.task('watch', function() {
gulp.watch('*.scss', ['sass']);
})
gulp.task('default', function(done) { // <--- Insert `done` as a parameter here...
gulp.series('clean','sass', 'watch')
done(); // <--- ...and call it here.
})
希望这能有所帮助!
其他回答
我的解决方案:把所有东西都放在async中，然后等待gulp。
async function min_css() {
return await gulp
.src(cssFiles, { base: "." })
.pipe(concat(cssOutput))
.pipe(cssmin())
.pipe(gulp.dest("."));
}
async function min_js() {
return await gulp
.src(jsFiles, { base: "." })
.pipe(concat(jsOutput))
.pipe(uglify())
.pipe(gulp.dest("."));
}
const min = async () => await gulp.series(min_css, min_js);
exports.min = min;
解决方案:我们需要调用回调函数(任务和匿名):
function electronTask(callbackA)
{
return gulp.series(myFirstTask, mySeccondTask, (callbackB) =>
{
callbackA();
callbackB();
})();
}
解决方案很简单，但我概述了我所做的更改、我得到的错误、前后的gulpfile以及包版本——因此使它看起来很长。
除了遵循保存.scss文件时输出的错误外，我还通过遵循前面多个答案的方向解决了这个问题。
简而言之:
我改变了gulp-sass的输入方式——见(A) 我把所有函数都改成了ASYNC函数——参见(B)
(A) gulp-sass import的改动:
之前:var sass = require('gulp-sass) After: var sass = require('gulp-sass')(require('sass'));
简单地将函数转换为ASYNC -
我的gulpfile看起来像以前:
'use strict';
// dependencies
var gulp = require('gulp');
var sass = require('gulp-sass');
var minifyCSS = require('gulp-clean-css');
var uglify = require('gulp-uglify');
var rename = require('gulp-rename');
var changed = require('gulp-changed');
var SCSS_SRC = './src/Assets/scss/**/*.scss';
var SCSS_DEST = './src/Assets/css';
function compile_scss() {
return gulp.src(SCSS_SRC)
.pipe(sass().on('error', sass.logError))
.pipe(minifyCSS())
.pipe(rename({ suffix: '.min' }))
.pipe(changed(SCSS_DEST))
.pipe(gulp.dest(SCSS_DEST));
}
function watch_scss() {
gulp.watch(SCSS_SRC, compile_scss);
}
gulp.task('default', watch_scss); //Run tasks
exports.compile_scss = compile_scss;
exports.watch_scss = watch_scss;
我的gulpfile看起来像:
'use strict';
// dependencies
var gulp = require('gulp');
//var sass = require('gulp-sass');
var sass = require('gulp-sass')(require('sass'));
var minifyCSS = require('gulp-clean-css');
var uglify = require('gulp-uglify');
var rename = require('gulp-rename');
var changed = require('gulp-changed');
var SCSS_SRC = './src/Assets/scss/**/*.scss';
var SCSS_DEST = './src/Assets/css';
async function compile_scss() {
return gulp.src(SCSS_SRC)
.pipe(sass().on('error', sass.logError))
.pipe(minifyCSS())
.pipe(rename({ suffix: '.min' }))
.pipe(changed(SCSS_DEST))
.pipe(gulp.dest(SCSS_DEST));
}
async function watch_scss() {
gulp.watch(SCSS_SRC, compile_scss);
}
gulp.task('default', watch_scss); // Run tasks
exports.compile_scss = compile_scss;
exports.watch_scss = watch_scss;
包版本:
"gulp": "^4.0.2",
"gulp-changed": "^4.0.3",
"gulp-rename": "^2.0.0",
"gulp-uglify": "^3.0.2",
"gulp-clean-css": "^4.3.0",
"gulp-sass": "^5.0.0",
"sass": "^1.38.0"
我得到的错误:
Error in plugin "gulp-sass"
Message:
gulp-sass 5 does not have a default Sass compiler; please set one yourself.
Both the `sass` and `node-sass` packages are permitted.
For example, in your gulpfile:
var sass = require('gulp-sass')(require('sass'));
[14:00:37] The following tasks did not complete: default, compile_scss
[14:00:37] Did you forget to signal async completion?
对于那些试图使用gulp进行本地部署的人，下面的代码将有所帮助
var gulp = require("gulp");
var yaml = require("js-yaml");
var path = require("path");
var fs = require("fs");
//Converts yaml to json
gulp.task("swagger", done => {
var doc = yaml.safeLoad(fs.readFileSync(path.join(__dirname,"api/swagger/swagger.yaml")));
fs.writeFileSync(
path.join(__dirname,"../yourjsonfile.json"),
JSON.stringify(doc, null, " ")
);
done();
});
//Watches for changes
gulp.task('watch', function() {
gulp.watch('api/swagger/swagger.yaml', gulp.series('swagger'));
});
在gulp版本4及更高版本中，要求所有gulp任务都告诉gulp任务将在何处结束。为此，我们调用一个函数，该函数作为任务函数中的第一个参数传递
var gulp = require('gulp');
gulp.task('first_task', function(callback) {
console.log('My First Task');
callback();
})
