Minimum react event pool

event-pool.js

const eventPool = [];
const EVENT_POOL_SIZE = 10;

function SyntheticEvent(nativeEvent) {
  this.nativeEvent = nativeEvent;
}

SyntheticEvent.prototype.persist = function persist() {
  this.isPersistent = true;
};

SyntheticEvent.prototype.destructor = function destructor() {
  this.nativeEvent = null;
};

export function getPooledEvent(nativeEvent) {
  if (eventPool.length) {
    const instance = eventPool.pop();
    // We should not use class here, or will throw Class constructor cannot be invoked without 'new'
    return SyntheticEvent.call(instance, nativeEvent);
  } else {
    return new SyntheticEvent(nativeEvent);
  }
}

export function releasePooledEvent(evt) {
  evt.destructor();

  if (eventPool.length < EVENT_POOL_SIZE) {
    eventPool.push(evt);
  }
}