Show success message when gulp task is completed - gulp

Question

I created a simple Gulp task to check for changes in my ES6 files. I would like to transpile them and show an error message when something went wrong.
The error screen is being displayed. However, I would like to show a different message when everything is successful. I tried the .on('end') method but this method will also be called when there are some errors.
My current Gulpfile looks like this:
const gulp = require('gulp');
const babel = require('gulp-babel');
const uglify = require('gulp-uglify');
const pump = require('pump');
const imagemin = require('gulp-imagemin');
const sass = require('gulp-sass');
const DISTRIBUTION_PATH = 'public/theme/js/app';
const plumber = require('gulp-plumber');
const gutil = require('gulp-util');
const clear = require('clear');
gulp.task('transpile', () =>
gulp.watch('theme/js/**/*.js', () => {
return gulp.src('theme/js/**/*.js')
.pipe(plumber())
.pipe(babel({
presets: ['es2015'],
plugins: [
'transform-object-rest-spread'
]
}))
.on('error', err => {
clear();
gutil.log(gutil.colors.red('[Compilation Error]'));
gutil.log(err.fileName + ( err.loc ? `( ${err.loc.line}, ${err.loc.column} ): ` : ': '));
gutil.log(gutil.colors.red('error Babel: ' + err.message + '\n'));
gutil.log(err.codeFrame);
})
.pipe(gulp.dest(DISTRIBUTION_PATH));
})
);
Any ideas how to achieve this?

Answer 1

Answer might be a bit late, but for the Googler like myself I've created a solution. I've added a boolean isSuccess to determine whether the transpilation was successful. If there is an error isSuccess becomes false and the message is not shown "on end."
const gulp = require('gulp');
const babel = require('gulp-babel');
const uglify = require('gulp-uglify');
const pump = require('pump');
const imagemin = require('gulp-imagemin');
const sass = require('gulp-sass');
const DISTRIBUTION_PATH = 'public/theme/js/app';
const plumber = require('gulp-plumber');
const gutil = require('gulp-util');
const clear = require('clear');
gulp.task('transpile', () =>
gulp.watch('theme/js/**/*.js', () => {
let isSuccess = true;
return gulp.src('theme/js/**/*.js')
.pipe(plumber())
.pipe(babel({
presets: ['es2015'],
plugins: [
'transform-object-rest-spread'
]
}))
.on('error', err => {
isSuccess = false;
clear();
gutil.log(gutil.colors.red('[Compilation Error]'));
gutil.log(err.fileName + ( err.loc ? `( ${err.loc.line}, ${err.loc.column} ): ` : ': '));
gutil.log(gutil.colors.red('error Babel: ' + err.message + '\n'));
gutil.log(err.codeFrame);
})
.pipe(gulp.dest(DISTRIBUTION_PATH))
.on('end', ()=> {
if( isSuccess )
console.log('Yay success!');
});
})
);

Answer 2

You can do
.on('error', () => {
// some log or code for failure
})
.on('end', () => {
// some log or code for success
});