gulp plugin for cwebp, doesn't require imagemagick.

gulp-cwebp.js

var through = require('through2')
  , gutil = require('gulp-util')
  
function cwebp() {
  var Webp = require('cwebp')
    , File = require('vinyl')

  return through.obj(function (file, enc, cb) {
    this.push(file)
    if (file.isBuffer()) {
      var pipeline = this
      new Webp(file.path).toBuffer().then(function(buffer) {
        var vfsBuffer = new File({
          cwd: file.cwd
        , base: file.base
        , path: gutil.replaceExtension(file.path, '.webp')
        , contents: buffer
        })
        pipeline.push(vfsBuffer)
        cb()
      }).otherwise(function(err) {
        console.log(err)
      })
    } else {
      cb()
    }
  })
}