Browser-sync TypeError args.cb is not a function - npm

Question

I'm using browser-sync in gulp task for example :
gulp.task('gulp-task',function(){
browserSync.init({
server:{
baseDir: 'app'
}
})
//rest of task
});
I use this gulp task in gulp watch for( for example ) app/**/*.html like :
gulp.task('watch',function(){
gulp.watch('app/**/*.html', ['gulp-task']);
});
for first time change in html files everything is ok but for next changes i get error:
TypeError: args.cbn is not a function ...
guys said to install latest version for browser-sync with command below :
npm install browser-sync#latest --save-dev
and it doesn't helped.
I'm getting the same error. what's wrong?

Answer 1

I also ran into this issue and solved it by removing the brackets from the callback in the watch task.
Try changing your watch task to:
gulp.task('watch',function(){
gulp.watch(['app/**/*.html'], 'gulp-task');
});
Or better yet, try using the reload method with something like this:
var gulp = require('gulp');
var browserSync = require('browser-sync').create();
var jshint = require('gulp-jshint');
var watch = require('gulp-watch');
var reload = browserSync.reload;
gulp.task('default', ['jshint', 'serve', 'watch']);
gulp.task('jshint', function() {
return gulp.src('src/app/**/*.js')
.pipe(jshint())
.pipe(jshint.reporter('jshint-stylish'));
});
// Static server
gulp.task('serve', function() {
browserSync.init({
server: {
baseDir: "./src"
}
});
});
gulp.task('watch', function() {
gulp.watch(['src/**/*.html', 'src/app/**/*.js'], reload);
});

Answer 2

After reading the document of browser-sync,I noticed that the method .init( config, cb ) has two parameters.So,change your code to this:
gulp.task('gulp-task',function(){
browserSync.init({
server:{
baseDir: 'app'
}
})
//rest of task
},function(){
// something you want to do
});

Answer 3

While defining the 'watch' we need to declare what all tasks need to be run before watch, this will sort the problem out.
Extra parameter with pre-planned tasks needs to be added in the watch task list of parameters.
gulp.task('watch', ['browserSync', 'sass'], function(){...})
var gulp = require('gulp');
var sass = require('gulp-sass');
var browserSync = require('browser-sync').create();
gulp.task('hello', function() {
console.log('Hello Gulp-Shash');
});
gulp.task('sass', function(){
return gulp.src('app/scss/**/*.scss')
.pipe(sass())
.pipe(gulp.dest('app/css'))
.pipe(browserSync.reload({
stream: true
}))
});
gulp.task('browserSync', function() {
browserSync.init({
server: {
baseDir: 'app'
},
})
})
gulp.task('watch', ['browserSync', 'sass'], function(){
gulp.watch('app/scss/**/*.scss', ['sass']);
})