lifecycle.js

export default function(target) {
  const originalMethods = {
    UNSAFE_componentWillMount: target.prototype.UNSAFE_componentWillMount || noop,
    componentDidMount: target.prototype.componentDidMount || noop,
    UNSAFE_componentWillUpdate: target.prototype.UNSAFE_componentWillUpdate || noop,
    componentDidUpdate: target.prototype.componentDidUpdate || noop,
    componentWillUnmount: target.prototype.componentWillUnmount || noop
  };

  target.prototype.UNSAFE_componentWillMount = function(...args) {
    const [name, identifier] = getIdentifiers(this, true);
    originalMethods.UNSAFE_componentWillMount.apply(this, args);
    recordTimestamp(name, identifier, 'willMount', Date.now());
  };

  target.prototype.componentDidMount = function(...args) {
    const [name, identifier] = getIdentifiers(this);
    originalMethods.componentDidMount.apply(this, args);
    recordTimestamp(name, identifier, 'didMount', Date.now());
    throttledRecordMetrics();
  };

  target.prototype.UNSAFE_componentWillUpdate = function(...args) {
    const [name, identifier] = getIdentifiers(this, true);
    originalMethods.UNSAFE_componentWillUpdate.apply(this, args);
    recordTimestamp(name, identifier, 'willUpdate', Date.now());
  };

  target.prototype.componentDidUpdate = function(...args) {
    const [name, identifier] = getIdentifiers(this);
    originalMethods.componentDidUpdate.apply(this, args);
    recordTimestamp(name, identifier, 'didUpdate', Date.now());
    throttledRecordMetrics();
  };

  target.prototype.componentWillUnmount = function(...args) {
    originalMethods.componentWillUnmount.apply(this, args);
    throttledRecordMetrics();
  };

  return target;
}