index.js

'use strict';

var React = require('react');

Object.defineProperty(exports, '__esModule', {
  value: true
});

/**
 * Configuration that allows overriding default behavior.
 * @type {Object}
 */
var config = {
  /**
   * If enabled=false then this essentially disables the try/catch monkey-patch
   * @type {Boolean}
   */
  enabled: true,

  /**
   * Currently thif is configured to console.error a useful message if one of you
   * Component lifecycle methos throws an error. You can override the implementation
   * to integrate with you'r eown error logging.
   * @param  {[Object]} errorReport The report metadata including component, method, error thrown.
   * @return {[void]}
   */
  errorHandler: function errorHandler(errorReport) {
    console.error('Error in ' + errorReport.component + '.' + errorReport.method + '(' + (errorReport.arguments ? '...' : '') + '): ' + errorReport.error, errorReport);
  }
};

exports.config = config;
/**
 * Implementation of the try/catch wrapper
 * @param  {[React.Component]} component The ES6 React.Component.prototype that contains the React lifecycle method.
 * @param  {[string]} method             The name of the method to wrap ex: "render"
 * @return {[React.Component]}           Returns the same React.Component.prototype method monkey-patched with the specified method wrapped with a try/catch
 */
var wrapWithTryCatch = function wrapWithTryCatch(component, method) {
  var unsafe = component[method];

  component[method] = function () {
    if (!config.enabled) {
      return;
    }
    try {
      return unsafe.apply(this, arguments);
    } catch (err) {
      var errorReport = {
        component: component.constructor.name,
        method: method,
        props: this.props,
        error: err
      };
      if (arguments.length > 0) {
        errorReport.arguments = arguments;
      }
      var returnValue = config.errorHandler(errorReport);
      if (method === 'render') {
        return returnValue || React.createElement('h1', {}, 'error');
      }
    }
  };

  if (method === "constructor") {
    console.log(component[method]);
  }
};

/**
 * Wraps each React.Component lifecycle method with a try/catch that enables easier development diagnostics of errors throwin within each method
 * Methods wrapped include: `render, componentWillMount, componentDidMount, componentWillReceiveProps, shouldComponentUpdate, componentWillUpdate, componentDidUpdate, componentWillUnmount`
 * @param  {[React.Component]} ComponentConstructor The React.Component you want to wrap lifecycle methods with a try/catch and error handler.
 * @return {[void]}                      [description]
 */
var wrapReactLifecycleMethodsWithTryCatch = function wrapReactLifecycleMethodsWithTryCatch(ComponentConstructor) {
  [
    'render',
    'componentWillMount',
    'componentDidMount',
    'componentWillReceiveProps',
    'shouldComponentUpdate',
    'componentWillUpdate',
    'componentDidUpdate',
    'componentWillUnmount'
  ].forEach(function (method) {
    if (ComponentConstructor.prototype[method]) {
      wrapWithTryCatch(ComponentConstructor.prototype, method);
    }
  });
};

exports.wrapReactLifecycleMethodsWithTryCatch = wrapReactLifecycleMethodsWithTryCatch;
exports['default'] = wrapReactLifecycleMethodsWithTryCatch;