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A library is ready for version 1.0 when its maintainers can define the public API, explain how they will handle compatibility, and reliably support users who depend on it. It does not need every planned feature; it needs a clear, tested contract that the team is ready to honor.
What does version 1.0 mean for a library?
Version 1.0 marks the point at which maintainers define the library’s public API as stable enough for users to rely on. The Semantic Versioning specification says, “Version 1.0.0 defines the public API.” That promise is meaningful only if users can tell which parts are covered and maintainers are prepared to preserve compatibility according to a published policy.
SemVer’s FAQ offers a practical signal: if software is used in production, or users have come to depend on its stable API, it should probably already be 1.0.0. Worrying about backwards compatibility is another sign that users may already be relying on a contract that deserves to be explicit.
What to check before releasing 1.0
Identify the supported public API
Document the interfaces users are expected to rely on: exported types and functions, configuration formats, and observable behavior, including relevant errors. Separate experimental or unstable features clearly. A library can stabilize its core while keeping newer areas unstable; GNOME’s library guidance discusses this approach in its library guidelines.
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Publish a compatibility and deprecation policy
Explain what counts as a breaking change, how deprecations work, and what migration time users can expect. Under SemVer, major version zero is initial development: the public API should not be considered stable. Once the project reaches 1.0, compatible bug fixes increment the patch version, compatible additions and deprecations increment the minor version, and backward-incompatible public API changes increment the major version.
Compatibility includes documented behavior, not just whether existing code still compiles or links. AndroidX’s API guidelines treat a behavior change that breaks existing clients and requires a corresponding API-documentation change as breaking, even when binary compatibility is preserved.
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Validate the behavior users depend on
Test representative use cases and supported environments with repeatable unit and integration checks. Check important compatibility assumptions and examples users are likely to copy; resolve known release-blocking failures and unreliable critical-path tests. These are practical readiness checks, not a universal coverage formula: the reviewed guidance does not establish a required test count or coverage percentage.
Prepare for adoption and ongoing maintenance
Users should be able to install the library through its intended distribution route and get started without relying on undocumented maintainer knowledge. Provide an API reference, examples, release notes, a way to report issues, license information, and a repeatable release procedure. Google’s documentation guidance addresses getting started, testing, debugging, and releasing; Rust’s API guidelines include documentation and release notes in API review. Google Open Source’s release preparation guidance also calls out public-facing materials, security implications, and third-party license notices.
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Use a readiness check, not a feature checklist
| Area | Ready signal | Warning signal |
|---|---|---|
| Public contract | Supported API and behavior are identified. | Users cannot distinguish supported features from internals or experiments. |
| Compatibility | Maintainers can explain and follow a forward versioning policy. | Routine changes silently break consumers. |
| Validation | Important workflows and assumptions have repeatable checks. | Core behavior is largely untested or release checks are unreliable. |
| Adoption | Installation, examples, reference documentation, and release notes are usable. | Users must infer setup or depend on undocumented guidance. |
| User reliance | Existing use and downstream dependencies are understood. | A stable label would imply a promise the maintainers cannot support. |
| Maintenance capacity | There is a credible way to triage issues and make releases. | No owner or release process exists to respond to user impact. |
The last two checks are decision criteria for assessing whether the project can support the promise; they are not formal SemVer requirements.
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No universal feature-completeness threshold or pre-release duration is established for libraries generally. A project may choose staged alpha, beta, and release-candidate periods to collect feedback and validate readiness, but its schedule is a project policy, not a general rule.
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For example, AndroidX guidance calls for at least two weeks in each alpha, beta, and release-candidate stage before moving to the next. Its requirements and description of beta as usable in production while still allowing bugs apply to AndroidX, not automatically to every library.
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How to make the decision
- Write down the contract. List supported interfaces and behavior, and label unstable areas.
- Set the rules for change. Publish versioning, breaking-change, and deprecation expectations before users must guess them.
- Check real usage paths. Run repeatable tests for important workflows, environments, and examples, then resolve release-blocking problems.
- Check the support burden. Confirm users can find documentation, report issues, and obtain releases through a process the maintainers can sustain.
- Release when the promise is credible. If users already depend on the API, make compatibility expectations explicit; if the team cannot yet support that commitment, continue development before calling the API stable.
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