work.suroh.tk/node_modules/bs-recipes/recipes/gulp.task.sequence/readme.md

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2019-12-02 12:22:45 +00:00
#Browsersync - Gulp, SASS + Slow running tasks
## Installation/Usage:
To try this example, follow these 4 simple steps.
**Step 1**: Clone this entire repo
```bash
$ git clone https://github.com/Browsersync/recipes.git bs-recipes
```
**Step 2**: Move into the directory containing this example
```bash
$ cd bs-recipes/recipes/gulp.task.sequence
```
**Step 3**: Install dependencies
```bash
$ npm install
```
**Step 4**: Run the example
```bash
$ npm start
```
### Additional Info:
This example highlights a common problem where you don't want to reload
the browser until a 2 or more slow-running tasks have completed. The solution
is to create the intermediate task that ensures `browserSync.reload` is not
called until both slow tasks are complete.
### Preview of `gulpfile.js`:
```js
var gulp = require('gulp');
var browserSync = require('browser-sync');
var sass = require('gulp-sass');
var reload = browserSync.reload;
var through = require("through2");
/**
* A slow task
*/
gulp.task('slow1', function () {
return gulp.src('./app/*.html')
.pipe(slowStream());
});
/**
* Another Slow task
*/
gulp.task('slow2', function () {
return gulp.src('./app/*.html')
.pipe(slowStream());
});
/**
* Separate task for the reaction to a file change
*/
gulp.task('html-watch', ['slow1', 'slow2'], reload);
/**
* Sass task for live injecting into all browsers
*/
gulp.task('sass', function () {
return gulp.src('./app/scss/*.scss')
.pipe(sass())
.pipe(gulp.dest('./app/css'))
.pipe(reload({stream: true}));
});
/**
* Serve and watch the html files for changes
*/
gulp.task('default', function () {
browserSync({server: './app'});
gulp.watch('./app/scss/*.scss', ['sass']);
gulp.watch('./app/*.html', ['html-watch']);
});
/**
* Simulate a slow task
*/
function slowStream () {
return through.obj(function (file, enc, cb) {
this.push(file);
setTimeout(cb, 2000);
});
}
```