Use optimize-abtest in code

1. Install npm i optimize-abtest or yarn add optimize-abtest
2. Import import useAbTest from 'optimize-abtest'
3. Use const { variant } = useAbTest('<yourAbTestName>'); to compare with string variant1 or variant2
4. Or simply use const { isExperienceActive } = useAbTest('<yourAbTestName>'); if there's only 1 variant available

Set up Google Optimize experiment

1. Create a new experiment
2. Add a variant to it
3. Edit Global JavaScript in the variant
4. Add the next two lines of code listed below:

window.dispatchEvent(new CustomEvent('<yourAbTestName>', {detail: 'variant1'}));
document.cookie = "<yourAbTestName>=variant1";

A bit of explanation here

The package uses a session-long cookie named <yourAbTestName> and one of its corresponding values either variant1 or variant2. const { variant } = useAbTest('<yourAbTestName>'); returns one of the strings either variant1 or variant2. Alternatively, you can import a boolean isExperienceActive witch return either variant1 is active or not.