var gulp = require('gulp'),
    rollup = require('rollup-stream'),
    source = require('vinyl-source-stream');
 
gulp.task('rollup', function() {
  return rollup({
      input: './src/main.js'
    })
    
    // give the file the name you want to output with.
    .pipe(source('app.js'))
    
    // and output to ./dist/app.js as normal.
    .pipe(gulp.dest('./dist'));
});

var gulp = require('gulp'),
    rollup = require('rollup-stream'),
    sourcemaps = require('gulp-sourcemaps'),
//  rename = require('gulp-rename'),
    source = require('vinyl-source-stream'),
    buffer = require('vinyl-buffer');
 
gulp.task('rollup', function() {
  return rollup({
      input: './src/main.js',
      sourcemap: true
    })
    
    // point to the entry file.
    .pipe(source('main.js', './src'))
    
    // buffer the output. most gulp plugins, including gulp-sourcemaps, don't support streams.
    .pipe(buffer())
    
    // tell gulp-sourcemaps to load the inline sourcemap produced by rollup-stream.
    .pipe(sourcemaps.init({loadMaps: true}))
        
        // transform the code further here.
        
    // if you want to output with a different name from the input file, use gulp-rename here.
//  .pipe(rename('index.js'))
    
    // write the sourcemap alongside the output file.
    .pipe(sourcemaps.write('.'))
    
    // and output to ./dist/main.js as normal.
    .pipe(gulp.dest('./dist'));
});

var gulp = require('gulp'),
    rollup = require('rollup-stream'),
    source = require('vinyl-source-stream');
 
var cache;
gulp.task('rollup', function() {
  return rollup({
      input: './src/main.js',
      cache: cache
    })
    
    .on('bundle', function(bundle) {
      cache = bundle;
    })
    
    // after listening for the 'bundle' event, proceed as usual.
    .pipe(source('app.js'))
    .pipe(gulp.dest('./dist'));
});
 
gulp.task('watch', function() {
  gulp.watch('./src/**/*.js', ['rollup']);
});

var gulp = require('gulp'),
    rollup = require('rollup-stream'),
    source = require('vinyl-source-stream');
 
gulp.task('rollup', function() {
  return rollup({
      input: './src/main.js',
      rollup: require('rollup')
    })
    
    // after passing options.rollup, proceed as usual.
    .pipe(source('app.js'))
    .pipe(gulp.dest('./dist'));
});

var gulp = require('gulp'),
    rollup = require('rollup-stream'),
    source = require('vinyl-source-stream');
 
gulp.task('rollup', function() {
  return rollup('rollup.config.js')
    .pipe(source('app.js'))
    .pipe(gulp.dest('./dist'));
});