Function confetti

confetti takes a single optional object. When window.Promise is available, it will return a Promise to let you know when it is done. When promises are not available (like in IE), it will return null. You can polyfill promises using any of the popular polyfills. You can also provide a custom promise implementation to confetti through:

 const MyPromise = require('some-promise-lib');
 const confetti = require('canvas-confetti');
 confetti.Promise = MyPromise;
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If you call confetti multiple times before it is done, it will return the same promise every time. Internally, the same canvas element will be reused, continuing the existing animation with the new confetti added. The promise returned by each call to confetti will resolve once all animations are done.