The init options, or null when Sentry must stay off
Remarks
Error reporting only: no tracing and no session replay, so the options
leave every sample rate out. Without a DSN nothing starts, which keeps
local development, CI and a build without Sentry variables silent.
Example
constoptions=sentryInitOptions(process.env.SENTRY_DSN); if (options) Sentry.init(options);
Decides whether Sentry starts, and with what.