gulp-comment-swap

Swap lines with comment in and out if they match regexp

Sample: comment out all typescript files that contain /*webpack*/ and comment in all lines that have /*systemjs*/ (swap)

npm install gulp-comment-swap -save-dev

and usage:

gulp.task('dev', function (done) {
    gulp.src('./src/**/*.ts')
        .pipe(commentSwap(new RegExp('/\\*prod\\*/'),new RegExp('/\\*dev\\*/'))).on('error', function(err){
            console.log('gulp-swap error: ' + err);
         })
        .pipe(gulp.dest('./src'));
    done()
});

this is a great way to support both system.js and webpack with Angular2 for example:

 **/
@Component({
//    template: require('./App2.html'),  /*webpack*/
	    templateUrl: '/src/comps/app2/App2.html', /*systemjs*/
    providers: [HTTP_PROVIDERS],
    directives: [ROUTER_DIRECTIVES, RouterLink, DividerPanel, Menu, MenuItem, Sliderpanel, Digg, Properties,
        Notes, Notes1, Notes2, Notes3, Notes4, Notes5, Weather, Logout, Contact, ModalDialog]
})
export class App2 {
    private screens:any;
    private commBroker:CommBroker;
    ...

the Gulp with swap between the two packaging systems.

enjoy!