@marvelapp/react-ab-test/lib/hook.js

A/B testing React components and debug tools. Isomorphic with a simple, universal interface. Well documented and lightweight. Tested in popular browsers and Node.js. Includes helpers for Mixpanel and Segment.com.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;

var _react = require("react");

var _emitter = _interopRequireDefault(require("./emitter"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }

function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }

function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

function _iterableToArrayLimit(arr, i) { var _i = arr && (typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"]); if (_i == null) return; var _arr = []; var _n = true; var _d = false; var _s, _e; try { for (_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }

function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }

var selectVariant = function selectVariant(currentVariant) {
  return function (variants, fallback) {
    if (currentVariant in variants) {
      return variants[currentVariant];
    }

    return fallback;
  };
};

var useExperiment = function useExperiment(experimentName, userIdentifier, defaultVariantName) {
  var _useState = (0, _react.useState)(_emitter["default"].calculateActiveVariant(experimentName, userIdentifier, defaultVariantName)),
      _useState2 = _slicedToArray(_useState, 2),
      activeVariant = _useState2[0],
      setActiveVariant = _useState2[1];

  (0, _react.useEffect)(function () {
    _emitter["default"]._incrementActiveExperiments(experimentName);

    _emitter["default"].setActiveVariant(experimentName, activeVariant);

    _emitter["default"]._emitPlay(experimentName, activeVariant);

    var variantListener = _emitter["default"].addActiveVariantListener(experimentName, function (name, variant) {
      if (name === experimentName && variant !== activeVariant) {
        setActiveVariant(variant);
      }
    });

    return function () {
      variantListener.remove();

      _emitter["default"]._decrementActiveExperiments(experimentName);
    };
  }, [experimentName, activeVariant]);
  return {
    experimentName: experimentName,
    activeVariant: activeVariant,
    emitWin: function emitWin() {
      return _emitter["default"].emitWin(experimentName);
    },
    selectVariant: selectVariant(activeVariant)
  };
};

var _default = useExperiment;
exports["default"] = _default;