JS array of canonical timezone names (from https://en.wikipedia.org/wiki/List_of_tz_database_time_zones)

timezones.js

/* eslint-disable-next-line */
export default ['Africa/Abidjan','Africa/Accra','Africa/Algiers','Africa/Bissau','Africa/Cairo','Africa/Casablanca','Africa/Ceuta','Africa/El_Aaiun','Africa/Johannesburg','Africa/Juba','Africa/Khartoum','Africa/Lagos','Africa/Maputo','Africa/Monrovia','Africa/Nairobi','Africa/Ndjamena','Africa/Tripoli','Africa/Tunis','Africa/Windhoek','America/Adak','America/Anchorage','America/Araguaina','America/Argentina/Buenos_Aires','America/Argentina/Catamarca','America/Argentina/Cordoba','America/Argentina/Jujuy','America/Argentina/La_Rioja','America/Argentina/Mendoza','America/Argentina/Rio_Gallegos','America/Argentina/Salta','America/Argentina/San_Juan','America/Argentina/San_Luis','America/Argentina/Tucuman','America/Argentina/Ushuaia','America/Asuncion','America/Atikokan','America/Bahia','America/Bahia_Banderas','America/Barbados','America/Belem','America/Belize','America/Blanc-Sablon','America/Boa_Vista','America/Bogota','America/Boise','America/Cambridge_Bay','America/Campo_Grande','America/Cancun','America/Caracas','America/Cayenne','America/Chicago','America/Chihuahua','America/Costa_Rica','America/Creston','America/Cuiaba','America/Curacao','America/Danmarkshavn','America/Dawson','America/Dawson_Creek','America/Denver','America/Detroit','America/Edmonton','America/Eirunepe','America/El_Salvador','America/Fort_Nelson','America/Fortaleza','America/Glace_Bay','America/Godthab','America/Goose_Bay','America/Grand_Turk','America/Guatemala','America/Guayaquil','America/Guyana','America/Halifax','America/Havana','America/Hermosillo','America/Indiana/Indianapolis','America/Indiana/Knox','America/Indiana/Marengo','America/Indiana/Petersburg','America/Indiana/Tell_City','America/Indiana/Vevay','America/Indiana/Vincennes','America/Indiana/Winamac','America/Inuvik','America/Iqaluit','America/Jamaica','America/Juneau','America/Kentucky/Louisville','America/Kentucky/Monticello','America/La_Paz','America/Lima','America/Los_Angeles','America/Maceio','America/Managua','America/Manaus','America/Martinique','America/Matamoros','America/Mazatlan','America/Menominee','America/Merida','America/Metlakatla','America/Mexico_City','America/Miquelon','America/Moncton','America/Monterrey','America/Montevideo','America/Nassau','America/New_York','America/Nipigon','America/Nome','America/Noronha','America/North_Dakota/Beulah','America/North_Dakota/Center','America/North_Dakota/New_Salem','America/Ojinaga','America/Panama','America/Pangnirtung','America/Paramaribo','America/Phoenix','America/Port_of_Spain','America/Port-au-Prince','America/Porto_Velho','America/Puerto_Rico','America/Punta_Arenas','America/Rainy_River','America/Rankin_Inlet','America/Recife','America/Regina','America/Resolute','America/Rio_Branco','America/Santarem','America/Santiago','America/Santo_Domingo','America/Sao_Paulo','America/Scoresbysund','America/Sitka','America/St_Johns','America/Swift_Current','America/Tegucigalpa','America/Thule','America/Thunder_Bay','America/Tijuana','America/Toronto','America/Vancouver','America/Whitehorse','America/Winnipeg','America/Yakutat','America/Yellowknife','Antarctica/Casey','Antarctica/Davis','Antarctica/DumontDUrville','Antarctica/Macquarie','Antarctica/Mawson','Antarctica/Palmer','Antarctica/Rothera','Antarctica/Syowa','Antarctica/Troll','Antarctica/Vostok','Asia/Almaty','Asia/Amman','Asia/Anadyr','Asia/Aqtau','Asia/Aqtobe','Asia/Ashgabat','Asia/Atyrau','Asia/Baghdad','Asia/Baku','Asia/Bangkok','Asia/Barnaul','Asia/Beirut','Asia/Bishkek','Asia/Brunei','Asia/Chita','Asia/Choibalsan','Asia/Colombo','Asia/Damascus','Asia/Dhaka','Asia/Dili','Asia/Dubai','Asia/Dushanbe','Asia/Famagusta','Asia/Gaza','Asia/Hebron','Asia/Ho_Chi_Minh','Asia/Hong_Kong','Asia/Hovd','Asia/Irkutsk','Asia/Jakarta','Asia/Jayapura','Asia/Jerusalem','Asia/Kabul','Asia/Kamchatka','Asia/Karachi','Asia/Kathmandu','Asia/Khandyga','Asia/Kolkata','Asia/Krasnoyarsk','Asia/Kuala_Lumpur','Asia/Kuching','Asia/Macau','Asia/Magadan','Asia/Makassar','Asia/Manila','Asia/Novokuznetsk','Asia/Novosibirsk','Asia/Omsk','Asia/Oral','Asia/Pontianak','Asia/Pyongyang','Asia/Qatar','Asia/Qyzylorda','Asia/Riyadh','Asia/Sakhalin','Asia/Samarkand','Asia/Seoul','Asia/Shanghai','Asia/Singapore','Asia/Srednekolymsk','Asia/Taipei','Asia/Tashkent','Asia/Tbilisi','Asia/Tehran','Asia/Thimphu','Asia/Tokyo','Asia/Tomsk','Asia/Ulaanbaatar','Asia/Urumqi','Asia/Ust-Nera','Asia/Vladivostok','Asia/Yakutsk','Asia/Yangon','Asia/Yekaterinburg','Asia/Yerevan','Atlantic/Azores','Atlantic/Bermuda','Atlantic/Canary','Atlantic/Cape_Verde','Atlantic/Faroe','Atlantic/Madeira','Atlantic/Reykjavik','Atlantic/South_Georgia','Atlantic/Stanley','Australia/Adelaide','Australia/Brisbane','Australia/Broken_Hill','Australia/Currie','Australia/Darwin','Australia/Eucla','Australia/Hobart','Australia/Lindeman','Australia/Lord_Howe','Australia/Melbourne','Australia/Perth','Australia/Sydney','Etc/GMT','Etc/UTC','Europe/Amsterdam','Europe/Andorra','Europe/Astrakhan','Europe/Athens','Europe/Belgrade','Europe/Berlin','Europe/Brussels','Europe/Bucharest','Europe/Budapest','Europe/Chisinau','Europe/Copenhagen','Europe/Dublin','Europe/Gibraltar','Europe/Helsinki','Europe/Istanbul','Europe/Kaliningrad','Europe/Kiev','Europe/Kirov','Europe/Lisbon','Europe/London','Europe/Luxembourg','Europe/Madrid','Europe/Malta','Europe/Minsk','Europe/Monaco','Europe/Moscow','Europe/Nicosia','Europe/Oslo','Europe/Paris','Europe/Prague','Europe/Riga','Europe/Rome','Europe/Samara','Europe/Saratov','Europe/Simferopol','Europe/Sofia','Europe/Stockholm','Europe/Tallinn','Europe/Tirane','Europe/Ulyanovsk','Europe/Uzhgorod','Europe/Vienna','Europe/Vilnius','Europe/Volgograd','Europe/Warsaw','Europe/Zaporozhye','Europe/Zurich','Indian/Chagos','Indian/Christmas','Indian/Cocos','Indian/Kerguelen','Indian/Mahe','Indian/Maldives','Indian/Mauritius','Indian/Reunion','Pacific/Apia','Pacific/Auckland','Pacific/Bougainville','Pacific/Chatham','Pacific/Chuuk','Pacific/Easter','Pacific/Efate','Pacific/Enderbury','Pacific/Fakaofo','Pacific/Fiji','Pacific/Funafuti','Pacific/Galapagos','Pacific/Gambier','Pacific/Guadalcanal','Pacific/Guam','Pacific/Honolulu','Pacific/Kiritimati','Pacific/Kosrae','Pacific/Kwajalein','Pacific/Majuro','Pacific/Marquesas','Pacific/Nauru','Pacific/Niue','Pacific/Norfolk','Pacific/Noumea','Pacific/Pago_Pago','Pacific/Palau','Pacific/Pitcairn','Pacific/Pohnpei','Pacific/Port_Moresby','Pacific/Rarotonga','Pacific/Tahiti','Pacific/Tarawa','Pacific/Tongatapu','Pacific/Wake','Pacific/Wallis']