vis.js is a dynamic, browser-based visualization library
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// Only load hammer.js when in a browser environment
// (loading hammer.js in a node.js environment gives errors)
if (typeof window !== 'undefined') {
module.exports = window['Hammer'] || require('hammerjs');
// TODO: throw an error when hammerjs is not available?
}
else {
module.exports = function () {
throw Error('hammer.js is only available in a browser, not in node.js.');
}
}