ng2-dragula 使用報錯 Uncaught ReferenceError: global is not defined

Angular2使用ng2-dragula實現拖拽功能報錯  ncaught ReferenceError: global is not defined     at Object../node_modules/crossvent/node_modules/custom-event/index.js (vendor.js:88511)     at __webpack_require__ (run

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