Add actor-preferred-username-required lint rule - #1022
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dahlia merged 8 commits intoSep 4, 2026
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@fedify/lint's existing "required property" rules all pair a property with a Context getter method (e.g. `id` <-> getActorUri()), so their generated error message can point at the right method to call. `preferredUsername` has no such getter -- it's a plain literal set directly on the actor -- so PropertyConfig.getter is now optional, and actorPropertyRequired() falls back to a simpler message when it's absent. This required generalizing test-templates.ts, which assumed every property has a getter in a couple of places: property-assignment code generation (used by the "good" test fixtures) and the mismatch tests' "wrong getter" picker. Both are fixed to skip getter-less properties instead of producing broken code or failing to compile. Assisted-by: Claude Code:claude-sonnet-5
Add the actor-preferred-username-required reference section to docs/manual/lint.md, matching the format used by the other required-property rules. Assisted-by: Claude Code:claude-sonnet-5
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Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughAdds the ChangesPreferred username lint rule
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This adds preferred-username diagnostics for actor dispatchers without changing runtime behavior. The rule, integrations, documentation, and regression coverage are in place, with no remaining merge-blocking risk. Sequence Diagram(s)sequenceDiagram
participant ActorDispatcher
participant LintRule
participant Diagnostic
ActorDispatcher->>LintRule: Return actor object or Tombstone
LintRule->>LintRule: Check preferredUsername
LintRule->>Diagnostic: Report missing property
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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dahlia
requested changes
Sep 3, 2026
| @@ -0,0 +1,3 @@ | |||
| - Added the `actor-preferred-username-required` lint rule, which warns | |||
| when an actor dispatcher's return value does not include a | |||
| `preferredUsername` property. [[#895]] | |||
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Please add the number of this pull request, and your name for the credit.
Also, you need to run sacho resolve-links.
dahlia
added
component/lint
`preferredUsername` uses vocab's singular/plural accessor sugar: a Person constructed with `preferredUsernames: [identifier]` behaves identically to one with `preferredUsername: identifier`. The actor-preferred-username-required rule only recognized the singular key, so it reported a false positive when only the plural initializer was used. PropertyConfig gains an optional `pluralName` field, and createRequiredRule now accepts either the configured path or its pluralized last segment when both are present. Only `preferredUsername` sets `pluralName`, so no other rule's behavior changes. Add a regression test covering the plural initializer. fedify-dev#1022 (comment) Assisted-by: Claude Code:claude-sonnet-5
Add the pull request number and contributor credit to the actor-preferred-username-required changelog fragment, and pin its reference links with `sacho resolve-links`. Note in the rule's documentation that it was introduced in Fedify 2.4.0, matching the version in changes.d/next.txt. fedify-dev#1022 (comment) fedify-dev#1022 (comment) Assisted-by: Claude Code:claude-sonnet-5
ActorDispatcher can return a Tombstone for a deleted actor, which Fedify treats like null for required-property purposes—there's no actor object to check. property-checker.ts's checkBranchWith() only special-cased null, so a dispatcher returning only a Tombstone, or a conditional dispatcher whose other branch returns an actor, both triggered a false positive. checkBranchWith() is shared by every required-property rule and already recurses into ternary and if/else branches, so treating `new Tombstone(...)` like null there fixes direct and mixed returns across all of them without touching the branching logic itself. Add regression tests to the shared required-rule edge case factory in test-templates.ts, covering a Tombstone-only return and a ternary mixing Tombstone with a valid actor. actor-id-required is excluded: a real Tombstone always carries an `id`, so a test built the same way would pass regardless of this fix and wouldn't verify anything. fedify-dev#1022 (comment) Assisted-by: Claude Code:claude-sonnet-5
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Inline comments:
In `@packages/lint/src/lib/property-checker.ts`:
- Around line 143-145: Update createPropertySearcher to check
isTombstoneExpression before extractFirstObjectExpression, matching the existing
null/tombstone guard used by checkBranchWith. Add a regression test covering an
expression-bodied dispatcher that returns new Tombstone(...), ensuring it is not
reported as missing a required property.
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The previous commit's Tombstone check lived in checkBranchWith(), which only runs for return statements and ternary/if-else branches. An arrow function with a concise body—`(ctx, identifier) => new Tombstone(...)`, with no `return` keyword—reaches createPropertySearcher()'s "NewExpression" case directly instead, bypassing that check and still reporting a false positive. Apply the same isTombstoneExpression() guard there, and add a regression test covering a concise-body actor dispatcher that returns only a Tombstone. fedify-dev#1022 (comment) Assisted-by: Claude Code:claude-sonnet-5
dahlia
changed the title
actor-preferred-username-required lint rule
dahlia
requested changes
Sep 4, 2026
Move the "introduced in Fedify 2.4.0" sentence to the very beginning of the actor-preferred-username-required section, ahead of the one-line description, as suggested. fedify-dev#1022 (comment) Assisted-by: Claude Code:claude-sonnet-5
dahlia
approved these changes
Sep 4, 2026
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Closes #895
Background
Most fediverse software expects actor objects to expose a stable
preferredUsername. Fedify applications can omit it, but that tends to make remote display, search, and profile rendering worse.@fedify/lintalready has rules that check other required actor properties (id,inbox,publicKey, etc.), but none of them coverpreferredUsername.Changes
actor-preferred-username-requiredrule (packages/lint/src/rules/actor-preferred-username-required.ts), warning when an actor dispatcher's return value omitspreferredUsername. Register it in Deno Lint, ESLint, and Oxlint (mod.ts, index.ts, oxlint.ts).preferredUsernamehas no correspondingContextgetter method, unlike every other required-property rule, soPropertyConfig.getteris now optional (lib/types.ts) andactorPropertyRequired()(lib/messages.ts) falls back to a simpler message when it's absent.preferredUsernamesince its setter (setActorDispatcher) is self-referential likeid's, unlike the genericcreateRequiredDispatcherRuleTeststemplate.Testing
mise run check-each lintnode --experimental-transform-types --test 'src/tests/**/*.test.ts'from packages/lint (610 tests pass, including oxlint's real-binary lane)AI disclosure
This was a mix of work I wrote myself and code Claude Code (
claude-sonnet-5) wrote after we worked through the design together — in particular, it found and fixed two issues my first attempts missed:test-templates.tsgenerating invalid example code (ctx.undefined(identifier)) for a getter-less property, and a type error in the mismatch-test helpers caused by the same change. I reviewed and verified all of it.