70 lines
1.8 KiB
JavaScript
70 lines
1.8 KiB
JavaScript
import hash from 'string-hash';
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const experiments = {
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'SyI-hI7gT9agiH-f3f0BYg': {
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id: 'SyI-hI7gT9agiH-f3f0BYg',
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run: function(variant, state, emitter) {
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state.promo = variant === 1 ? 'body' : 'header';
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emitter.emit('render');
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},
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eligible: function() {
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return (
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!/firefox/i.test(navigator.userAgent) &&
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document.querySelector('html').lang === 'en-US'
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);
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},
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variant: function(state) {
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return this.luckyNumber(state) > 0.5 ? 1 : 0;
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},
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luckyNumber: function(state) {
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return luckyNumber(
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`${this.id}:${state.storage.get('testpilot_ga__cid')}`
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);
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}
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}
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};
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//Returns a number between 0 and 1
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// eslint-disable-next-line no-unused-vars
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function luckyNumber(str) {
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return hash(str) / 0xffffffff;
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}
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function checkExperiments(state, emitter) {
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const all = Object.keys(experiments);
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const id = all.find(id => experiments[id].eligible(state));
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if (id) {
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const variant = experiments[id].variant(state);
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state.storage.enroll(id, variant);
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experiments[id].run(variant, state, emitter);
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}
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}
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export default function initialize(state, emitter) {
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emitter.on('DOMContentLoaded', () => {
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const xp = experiments[state.query.x];
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if (xp) {
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xp.run(+state.query.v, state, emitter);
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}
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});
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if (!state.storage.get('testpilot_ga__cid')) {
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// first ever visit. check again after cid is assigned.
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emitter.on('DOMContentLoaded', () => {
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checkExperiments(state, emitter);
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});
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} else {
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const enrolled = state.storage.enrolled.filter(([id, variant]) => {
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const xp = experiments[id];
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if (xp) {
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xp.run(variant, state, emitter);
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}
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return !!xp;
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});
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// single experiment per session for now
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if (enrolled.length === 0) {
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checkExperiments(state, emitter);
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}
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}
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}
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