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Some browser-like environments do not support localStorage nor process.env, but can be provided environment variables because they automatically get inlined (i.e. process.env.XYZ gets replaced by whatever value XYZ is during a build step). This change supports this scenario without breaking previous behavior.
As additional context, I am running into issues when trying to use debug in a Shopify POS extension. These extensions run in a sandboxed version of JS that lacks many built-ins like localStorage. Shopify's build step automatically inlines environment variables, but this still failed because
process
would not be defined, which the previous code required