fix: don't report empty environment variables as missing - #16401
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Rich-Harris merged 1 commit intoJul 18, 2026
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Rich-Harris
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As invited in [#16195](#16195 (comment)), `defineEnvVars` now accepts a function in place of a Standard Schema. The contract mirrors `defineParams`: the function returns the (possibly transformed) value, or `undefined` if the value is invalid. It can also throw, in which case the error's message appears in the startup report, since a bare `undefined` can't carry one. Throwing is the only rejection path, returning any value including `undefined` accepts it, so a function validator can describe an optional variable without a fallback. `defineEnvVars` normalizes functions to standard schemas, so `validate` and the generated `env.d.ts` types are unchanged (the return type is mapped like `DefinedParams`). Also adds the `@sveltejs/kit/env` tsconfig paths entry that #16378 didn't need yet. Built on top of #16401. --- ### Please don't delete this checklist! Before submitting the PR, please make sure you do the following: - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] This message body should clearly illustrate what problems it solves. - [x] Ideally, include a test that fails without this PR but passes with it. ### Tests - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint` and `pnpm check` ### Changesets - [x] If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running `pnpm changeset` and following the prompts. Changesets that add features should be `minor` and those that fix bugs should be `patch`. Please prefix changeset messages with `feat:`, `fix:`, or `chore:`. ### Edits - [x] Please ensure that 'Allow edits from maintainers' is checked. PRs without this option may be closed.
Rich-Harris
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This PR was opened by the [Changesets release](https://github.com/changesets/action) GitHub action. When you're ready to do a release, you can merge this and the packages will be published to npm automatically. If you're not ready to do a release yet, that's fine, whenever you add more changesets to version-3, this PR will be updated.⚠️ ⚠️ ⚠️ ⚠️ ⚠️ ⚠️ `version-3` is currently in **pre mode** so this branch has prereleases rather than normal releases. If you want to exit prereleases, run `changeset pre exit` on `version-3`.⚠️ ⚠️ ⚠️ ⚠️ ⚠️ ⚠️ # Releases ## @sveltejs/kit@3.0.0-next.11 ### Major Changes - breaking: `config` exported from a universal route file takes precedence over a server one ([#16400](#16400)) - breaking: consistent special filename patterns ([#16382](#16382)) ### Minor Changes - feat: support sourcemaps in production ([#16412](#16412)) - feat: support function validators for environment variables ([#16402](#16402)) - feat: better error logging ([#16374](#16374)) ### Patch Changes - fix: don't treat callable standard schemas as function param matchers ([#16403](#16403)) - fix: reject malformed streamed data encoding ([#16423](#16423)) - fix: hide stack traces for internal errors like 404s ([#16411](#16411)) - perf: match only unpaired surrogates when escaping HTML ([#16407](#16407)) - fix: don't report empty environment variables as missing ([#16401](#16401)) - chore: clarify which hooks run during server route resolution ([#16397](#16397)) ## @sveltejs/adapter-node@6.0.0-next.5 ### Minor Changes - feat: better error logging ([#16374](#16374)) ### Patch Changes - Updated dependencies [[`5220191`](5220191), [`8cb2f7d`](8cb2f7d), [`b88c7a7`](b88c7a7), [`a6ea113`](a6ea113), [`6446f64`](6446f64), [`58f1789`](58f1789), [`09774a2`](09774a2), [`c542fdd`](c542fdd), [`aedaa27`](aedaa27), [`428ee1a`](428ee1a), [`fefb3ae`](fefb3ae)]: - @sveltejs/kit@3.0.0-next.11 Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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As requested in #16195, the missing-value check in
validateis nowvalue === undefined, so an empty string counts as set. Also updates theEnvVarConfig.schemaJSDoc, which documented the old check, and adds a spec forvalidatewhose empty-string test fails without the fix.Function validators will be a separate PR.
Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
Tests
pnpm testand lint the project withpnpm lintandpnpm checkChangesets
pnpm changesetand following the prompts. Changesets that add features should beminorand those that fix bugs should bepatch. Please prefix changeset messages withfeat:,fix:, orchore:.Edits