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browserify timeline failed

Hi, I've tried to get my own custom build with only a timeline and dataset. I used the code from the example and get the following error:

xxxxx:vis xx$ browserify custom.js -t babelify -o vis-custom.js -s vis
Error: Parsing file /Users/xx/vis/lib/timeline/Timeline.js: 'import' and 'export' may appear only with 'sourceType: module' (18:0)
    at Deps.parseDeps (/usr/local/lib/node_modules/browserify/node_modules/module-deps/index.js:454:28)
    at fromSource (/usr/local/lib/node_modules/browserify/node_modules/module-deps/index.js:391:44)
    at /usr/local/lib/node_modules/browserify/node_modules/module-deps/index.js:385:17
    at ConcatStream.<anonymous> (/usr/local/lib/node_modules/browserify/node_modules/concat-stream/index.js:36:43)
    at emitNone (events.js:91:20)
    at ConcatStream.emit (events.js:185:7)
    at finishMaybe (/usr/local/lib/node_modules/browserify/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_writable.js:475:14)
    at endWritable (/usr/local/lib/node_modules/browserify/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_writable.js:485:3)
    at ConcatStream.Writable.end (/usr/local/lib/node_modules/browserify/node_modules/concat-stream/node_modules/readable-stream/lib/_stream_writable.js:455:41)
    at DuplexWrapper.onend (/usr/local/lib/node_modules/browserify/node_modules/readable-stream/lib/_stream_readable.js:500:10)

The custom.js is just from the official example too:

exports.DataSet = require('./lib/DataSet');
exports.Timeline = require('./lib/timeline/Timeline');

I have updated all the necessary utilities (node etc.):

├── babelify@7.3.0 
├── browserify@13.1.1 
└── uglify-js@2.7.4

What I am doing wrong?