react-hot-api/modules/makeMakeHot.js

'use strict';

var makePatchReactClass = require('./makePatchReactClass');

/**
 * Returns a function that, when invoked, patches a React class with a new
 * version of itself. To patch different classes, pass different IDs.
 */
module.exports = function makeMakeHot(getRootInstances) {
  if (typeof getRootInstances !== 'function') {
    throw new Error('Expected getRootInstances to be a function.');
  }

  var patchers = {};

  return function makeHot(NextClass, persistentId) {
    persistentId = persistentId || NextClass.displayName || NextClass.name;

    if (!persistentId) {
      console.error(
        'Hot reload is disabled for one of your types. To enable it, pass a ' +
        'string uniquely identifying this class within this current module ' +
        'as a second parameter to makeHot.'
      );
      return NextClass;
    }

    if (!patchers[persistentId]) {
      patchers[persistentId] = makePatchReactClass(getRootInstances);
    }

    var patchReactClass = patchers[persistentId];
    return patchReactClass(NextClass);
  };
};