Missing tz's from timezone-soft not handled gracefully

[admc]

Describe the bug

I'm try to pass the full list of timezones available in the browser in as a custom timezone list, many work, but a handful don't, and those crash trying to access the empty output from calling timezone-soft

The list of missing timezones can be found in the ticket I logged with them: https://github.com/spencermountain/timezone-soft/issues/17

Some fail accessing the .daylight prop and others .standard

It would be great if this were to be fixed so that you can just pass the full list in and it will work, even if not perfectly.

Thanks very much for your time,

Adam

---

this is how I generate the list for your testing purposes:

  const timezones = Intl.supportedValuesOf("timeZone");
  const tzObj = timezones.reduce((a, v) => ({ ...a, [v]: v }), {});

Reproduction

pass in an object of timezone keys and values from the browser timezone list

System Info

System:
    OS: macOS 12.5
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 43.10 MB / 16.00 GB
    Shell: 5.8.1 - /bin/zsh
  Binaries:
    Node: 18.7.0 - ~/.nvm/versions/node/v18.7.0/bin/node
    Yarn: 1.22.19 - ~/Projects/stateful/app/node_modules/.bin/yarn
    npm: 8.15.0 - ~/.nvm/versions/node/v18.7.0/bin/npm
  Browsers:
    Brave Browser: 89.1.22.67
    Chrome: 103.0.5060.134
    Firefox: 101.0
    Safari: 15.6

Used Package Manager

yarn

Validations

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• [X] Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• [X] The provided reproduction is a minimal reproducible of the bug.