splitster/src/tools/cookiesTools.js

Javascript AB testing tool

// @flow
import R from 'ramda'

import type { SaveResults } from '../types'

/**
 * How cookies will set
 *
 * Tests:
 * {prefix}_{test}_{test-id}={winning_variant_id}
 * splitster_test_button_color=red
 * splitster_test_show_widget=show
 *
 * Variants will be in config,
 * tracks will be in config
 * ... so basically tests are enough for now
 */

export const filterCookiesByPrefix = (
  cookies: SaveResults,
  prefix: string = 'splitster_',
): Array<string> => R.filter(R.startsWith(prefix), R.keys(cookies))

/**
 * Parse cookies with keys {prefix_test_id} to {test_id}
 * @param prefix
 * @param cookies
 * @returns {*}
 */
export const parseCookies = (
  cookies: SaveResults,
  prefix: string = 'splitster_',
): SaveResults =>
  R.reduce(
    (acc, key) =>
      R.assoc(R.slice(prefix.length, key.length, key), cookies[key], acc),
    {},
    filterCookiesByPrefix(cookies, prefix),
  )

// // TODO: write tests
// export const parseTest = (test: Test, prefix: string = "splitster_"): string =>
//   test.winningVariant ? test.winningVariant.id : ""

// export const parseTestIds = (testIds: Array<string>, splitster: Splitster, prefix: string = "splitster_"): Cookies =>
//   R.reduce(
//     (acc, testId) => R.assoc(`${prefix}test_${testId}`, parseTest(splitster.tests[testId]), acc),
//     {},
//     testIds,
//   )

// TODO: write tests
// TODO: unnecessary?
// export const parseTests = (tests: Tests, prefix: string = "splitster_"): Cookies =>
//   R.reduce(
//     (acc, key) => R.assoc(`${prefix}test_${key.id}`, parseTest(key), acc),
//     {},
//     R.values(tests),
//   )