Gulp复制任务完成后如何执行通知？

Question

I have a copy task in my gulpfile.js , and I want notify ( gulp-notify ) after copy is complete, now, when I execute copy task, notify function is called many times.

const notify = require('gulp-notify')
    , gulp = require('gulp')
    ;

gulp.task('copy', copyTask);

function copyTask() {
    return gulp.src('src/**/*')
        .pipe(gulp.dest('dest'))
        .pipe(notify('Copy task is completed!'));
}

In my terminal:

[13:23:40] Starting 'copy'...
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.
[13:23:40] gulp-notify: [Gulp notification] Copy task is completed.

How to can I fix this, to execute only time, after gulp.dest is completed?

Answer 1

You can use the onLast option :

function copyTask() {
  return gulp.src('src/**/*')
    .pipe(gulp.dest('dest'))
    .pipe(notify({
      message: 'Copy task is completed!',
      onLast: true
    }));
}