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Drop TypeScript 3.8 support #18477

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#18604
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Drop TypeScript 3.8 support#18477
#18604
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logaretm
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State: BlockedTaskjavascriptPull requests that update javascript code

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@logaretm
logaretm
opened on Dec 11, 2025

Following our discussion in Bikeshedding, we discussed the possibility of dropping downlevel process along with our support for TypeScript 3.8 types.

Reasons for dropping support:

  • TypeScript 4 was released back in 2020, TypeScript 5 back in 2023.
  • Downlevel (tool we use for type conversion) is not maintained and outdated.
  • Downleveling limits the benefits of adopting rolldown as it creates a sync dependency between type generation and the bundling step.

Reasons against:

  • Users might still be using TS 3.8 types.


Our discussion resulted in deciding to tentatively drop support but also settle on the minimum TS supported version.

If users complain about this we could re-introduce it as a release-only script rather than a core process of the build process.

Activity

  1. logaretm
    self-assigned this
    on Dec 11, 2025

  2. linear commented on Dec 11, 2025

    @linear
    linearbot
    on Dec 11, 2025 – with Linear

    JS-1293

  3. logaretm
    added
    javascriptPull requests that update javascript code
    on Dec 11, 2025
  4. logaretm
    linked a pull request that will close this issuefeat(v11): Drop TypeScript 3.8 support #18604on Dec 22, 2025

  5. logaretm commented on Dec 24, 2025

    @logaretm
    logaretm
    on Dec 24, 2025 – with Linear
    MemberAuthor

    Since v9 migration guide recommends:

    TypeScript Version Policy

    In preparation for v2 of the OpenTelemetry SDK, the minimum required TypeScript version is increased to version 5.0.4.

    Additionally, like the OpenTelemetry SDK, the Sentry JavaScript SDK will follow DefinitelyType's version support policy which has a support time frame of 2 years for any released version of TypeScript.

    Older TypeScript versions may continue to be compatible, but no guarantees apply.

    That means our users should be already on 5.x since we gave no guarantees for lower releases. I think the new minimum according to this could be 5.0.4

  6. stephanie-anderson
    added
    Task
    on Mar 24, 2026
  7. christophaigner
    added
    State: Blocked
    on Jul 16, 2026
  8. logaretm
    closed this as completedin #18604on Jul 21, 2026
  9. logaretm
    added a commit that references this issue on Jul 21, 2026

    feat(v11): Drop TypeScript 3.8 support (#18604)

    edc87d3

  10. github-actions commented on Sep 23, 2026

    @github-actions
    github-actionsbot
    on Sep 23, 2026 – with GitHub Actions
    Contributor

    A PR closing this issue has just been released 🚀

    This issue was referenced by PR #18604, which was included in the 11.0.0 release.

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