Function for a custom emoji.
Example for stopping the instance from awaiting from further reacts:
 (user, instance) => {
     // Either
     throw 'stopped';
     // or
     return Promise.reject('stopped');
     // will stop the instance from awaiting reacts.
     // Passing an error object will emit the `error` event.
 };
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Function for a custom emoji.
Example for stopping the instance from awaiting from further reacts:
(user, instance) => { // Either throw 'stopped'; // or return Promise.reject('stopped'); // will stop the instance from awaiting reacts. // Passing an error object will emit the `error` event. };