react-split-testing/dist/index.js

Simple A/B testing component for React.

'use strict';

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

function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }

var React = require('react');
var React__default = _interopDefault(React);
var PropTypes = _interopDefault(require('prop-types'));

function _classCallCheck(instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
}

var classCallCheck = _classCallCheck;

function _defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
    var descriptor = props[i];
    descriptor.enumerable = descriptor.enumerable || false;
    descriptor.configurable = true;
    if ("value" in descriptor) descriptor.writable = true;
    Object.defineProperty(target, descriptor.key, descriptor);
  }
}

function _createClass(Constructor, protoProps, staticProps) {
  if (protoProps) _defineProperties(Constructor.prototype, protoProps);
  if (staticProps) _defineProperties(Constructor, staticProps);
  return Constructor;
}

var createClass = _createClass;

function createCommonjsModule(fn, module) {
	return module = { exports: {} }, fn(module, module.exports), module.exports;
}

var _typeof_1 = createCommonjsModule(function (module) {
function _typeof2(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof2 = function _typeof2(obj) { return typeof obj; }; } else { _typeof2 = function _typeof2(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof2(obj); }

function _typeof(obj) {
  if (typeof Symbol === "function" && _typeof2(Symbol.iterator) === "symbol") {
    module.exports = _typeof = function _typeof(obj) {
      return _typeof2(obj);
    };
  } else {
    module.exports = _typeof = function _typeof(obj) {
      return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : _typeof2(obj);
    };
  }

  return _typeof(obj);
}

module.exports = _typeof;
});

function _assertThisInitialized(self) {
  if (self === void 0) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return self;
}

var assertThisInitialized = _assertThisInitialized;

function _possibleConstructorReturn(self, call) {
  if (call && (_typeof_1(call) === "object" || typeof call === "function")) {
    return call;
  }

  return assertThisInitialized(self);
}

var possibleConstructorReturn = _possibleConstructorReturn;

var getPrototypeOf = createCommonjsModule(function (module) {
function _getPrototypeOf(o) {
  module.exports = _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
    return o.__proto__ || Object.getPrototypeOf(o);
  };
  return _getPrototypeOf(o);
}

module.exports = _getPrototypeOf;
});

var setPrototypeOf = createCommonjsModule(function (module) {
function _setPrototypeOf(o, p) {
  module.exports = _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
    o.__proto__ = p;
    return o;
  };

  return _setPrototypeOf(o, p);
}

module.exports = _setPrototypeOf;
});

function _inherits(subClass, superClass) {
  if (typeof superClass !== "function" && superClass !== null) {
    throw new TypeError("Super expression must either be null or a function");
  }

  subClass.prototype = Object.create(superClass && superClass.prototype, {
    constructor: {
      value: subClass,
      writable: true,
      configurable: true
    }
  });
  if (superClass) setPrototypeOf(subClass, superClass);
}

var inherits = _inherits;

function _defineProperty(obj, key, value) {
  if (key in obj) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
  } else {
    obj[key] = value;
  }

  return obj;
}

var defineProperty = _defineProperty;

function getRandom(seed) {
  var newSeed = 0;

  for (var i = 0; i < seed.length; i++) {
    newSeed += seed.charCodeAt(i) * Math.pow(10, i);
  }

  var x = Math.sin(newSeed) * 10000;
  return x - Math.floor(x);
}

function weightedRandom(weights, randomSeed) {
  // randomSeed must be a string
  if (!randomSeed) {
    return -1;
  }

  var totalWeight = 0;

  for (var i = 0; i < weights.length; i++) {
    totalWeight += weights[i];
  }

  var random = getRandom(randomSeed) * totalWeight;

  for (var _i = 0; _i < weights.length; _i++) {
    if (random < weights[_i]) {
      return _i;
    }

    random -= weights[_i];
  }

  return -1;
}

function generateIdentifier() {
  var possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
  var text = '';

  for (var i = 0; i < 20; i++) {
    text += possible.charAt(Math.floor(Math.random() * possible.length));
  }

  return text;
}

function getIdentifier(userIdentifier) {
  if (userIdentifier || userIdentifier === 0) {
    return String(userIdentifier);
  }

  if (typeof window === 'undefined' || !('localStorage' in window)) {
    return null;
  }

  var key = '__ab_experiment_identifier__';

  try {
    userIdentifier = localStorage.getItem(key);
    userIdentifier = userIdentifier && String(userIdentifier);

    if (!userIdentifier) {
      userIdentifier = generateIdentifier();
      localStorage.setItem(key, userIdentifier);
    }
  } catch (exception) {
    return null;
  }

  return userIdentifier;
}

function getWeight(weight) {
  return weight || weight === 0 ? parseFloat(weight) : 1;
}

var Experiment =
/*#__PURE__*/
function (_Component) {
  inherits(Experiment, _Component);

  function Experiment(props) {
    var _this;

    classCallCheck(this, Experiment);

    _this = possibleConstructorReturn(this, getPrototypeOf(Experiment).call(this, props));
    _this.state = {};
    _this.state.activeVariant = _this._chooseVariant(true);
    return _this;
  }

  createClass(Experiment, [{
    key: "componentDidUpdate",
    value: function componentDidUpdate(prevProps) {
      var _this$props = this.props,
          name = _this$props.name,
          children = _this$props.children,
          userIdentifier = _this$props.userIdentifier,
          variantName = _this$props.variantName;
      var isNewExperiment = prevProps.name !== name || prevProps.userIdentifier !== userIdentifier || prevProps.variantName !== variantName;

      if (!isNewExperiment && prevProps.children === children) {
        return;
      }

      this.setState({
        activeVariant: this._chooseVariant(prevProps, isNewExperiment)
      });
    }
  }, {
    key: "getActiveVariant",
    value: function getActiveVariant() {
      return this.state.activeVariant;
    }
  }, {
    key: "getActiveVariantName",
    value: function getActiveVariantName() {
      return this.state.activeVariant && this.state.activeVariant.props.name;
    }
  }, {
    key: "getName",
    value: function getName() {
      return this.props.name;
    }
  }, {
    key: "getVariant",
    value: function getVariant(variantName) {
      var _this2 = this;

      var children = React__default.Children.toArray(this.props.children);
      return children.find(function (element) {
        return _this2._isVariant(element) && element.props.name === variantName;
      });
    }
  }, {
    key: "_chooseVariant",
    value: function _chooseVariant(isNewExperiment) {
      var _this$props2 = this.props,
          variantName = _this$props2.variantName,
          userIdentifier = _this$props2.userIdentifier;

      if (variantName) {
        var _variant = this.getVariant(variantName);

        if (isNewExperiment && _variant) {
          this._onChoice(_variant);
        }

        return _variant;
      }

      var children = React__default.Children.toArray(this.props.children);
      var activeVariantName = this.state.activeVariant && this.state.activeVariant.props.name;
      var variants = [],
          weights = [];
      var _iteratorNormalCompletion = true;
      var _didIteratorError = false;
      var _iteratorError = undefined;

      try {
        for (var _iterator = children[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
          var element = _step.value;

          if (!this._isVariant(element)) {
            continue;
          }

          if (!isNewExperiment && activeVariantName === element.props.name) {
            return element;
          }

          variants.push(element);
          weights.push(getWeight(element.props.weight));
        }
      } catch (err) {
        _didIteratorError = true;
        _iteratorError = err;
      } finally {
        try {
          if (!_iteratorNormalCompletion && _iterator["return"] != null) {
            _iterator["return"]();
          }
        } finally {
          if (_didIteratorError) {
            throw _iteratorError;
          }
        }
      }

      var randomSeed = getIdentifier(userIdentifier);
      var index = weightedRandom(weights, randomSeed);

      if (index === -1) {
        return null;
      }

      var variant = variants[index];

      this._onChoice(variant);

      return variant;
    }
  }, {
    key: "_isVariant",
    value: function _isVariant(element) {
      if (!React__default.isValidElement(element)) {
        return false;
      }

      if (!element.type.isVariant) {
        throw new Error('Experiment children must be Variant components.');
      }

      return true;
    }
  }, {
    key: "_onChoice",
    value: function _onChoice(variant) {
      var _this$props3 = this.props,
          onChoice = _this$props3.onChoice,
          onRawChoice = _this$props3.onRawChoice,
          name = _this$props3.name;

      if (onChoice instanceof Function) {
        onChoice(name, variant.props.name);
      }

      if (onRawChoice instanceof Function) {
        onRawChoice(this, variant);
      }
    }
  }, {
    key: "render",
    value: function render() {
      return this.state.activeVariant;
    }
  }]);

  return Experiment;
}(React.Component);

defineProperty(Experiment, "propTypes", {
  name: PropTypes.string.isRequired,
  onChoice: PropTypes.func,
  onRawChoice: PropTypes.func,
  userIdentifier: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
  variantName: PropTypes.string
});

var Variant =
/*#__PURE__*/
function (_Component) {
  inherits(Variant, _Component);

  function Variant() {
    classCallCheck(this, Variant);

    return possibleConstructorReturn(this, getPrototypeOf(Variant).apply(this, arguments));
  }

  createClass(Variant, [{
    key: "getName",
    value: function getName() {
      return this.props.name;
    }
  }, {
    key: "getWeight",
    value: function getWeight$1() {
      return getWeight(this.props.weight);
    }
  }, {
    key: "render",
    value: function render() {
      return this.props.children;
    }
  }]);

  return Variant;
}(React.Component);

defineProperty(Variant, "propTypes", {
  name: PropTypes.string.isRequired,
  weight: PropTypes.oneOfType([PropTypes.string, PropTypes.number])
});

defineProperty(Variant, "isVariant", true);

exports.Experiment = Experiment;
exports.Variant = Variant;
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