import hash from 'string-hash'; import Account from './ui/account'; const experiments = { signin_button_color: { eligible: function() { return true; }, variant: function() { return ['white-blue', 'blue', 'white-violet', 'violet'][ Math.floor(Math.random() * 4) ]; }, run: function(variant, state) { const account = state.cache(Account, 'account'); account.buttonClass = variant; } } }; //Returns a number between 0 and 1 // eslint-disable-next-line no-unused-vars function luckyNumber(str) { return hash(str) / 0xffffffff; } function checkExperiments(state, emitter) { const all = Object.keys(experiments); const id = all.find(id => experiments[id].eligible(state)); if (id) { const variant = experiments[id].variant(state); state.storage.enroll(id, variant); experiments[id].run(variant, state, emitter); } } export default function initialize(state, emitter) { emitter.on('DOMContentLoaded', () => { const xp = experiments[state.query.x]; if (xp) { xp.run(+state.query.v, state, emitter); } }); const enrolled = state.storage.enrolled; // single experiment per session for now const id = Object.keys(enrolled)[0]; if (Object.keys(experiments).includes(id)) { experiments[id].run(enrolled[id], state, emitter); } else { checkExperiments(state, emitter); } }