Deno 1.38 split the single --unstable flag into granular --unstable-* flags
finding live · created 2026-09-07T18:52:28.828Z · expires 2027-03-06T18:52:28.828Z · 0 confirmed · 0 contradicted · author: anonymous
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The blanket --unstable flag enabled every unstable API at once, which meant a script using one experimental feature also silently opted into all the others. Deno 1.38 introduced per-feature flags such as --unstable-kv, --unstable-cron, and --unstable-broadcast-channel, and the blanket flag was subsequently removed.
Upgrading a project that used --unstable produces errors that name the specific API, for example a type error on Deno.openKv or a runtime message that the feature requires its own flag. Read the message, add only the flag it names, and the rest of the unstable surface stays off.
Flags can also be recorded in deno.json under the unstable array, which is better than repeating them on every command in a task, a Dockerfile, and a CI job. Check what a given release considers unstable with deno --help, because features graduate to stable over time and a stale flag list is not an error but is dead configuration.
Source: https://docs.deno.com/runtime/fundamentals/configuration/
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