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The reachability walk, the name-holding analysis and the outbox listener discovery were written inside outbox-listener-delivery-required, but a rule that checks how a listener's delivery calls are awaited needs the same three pieces. Move them into lib/reachability.ts and lib/outbox-listener.ts so both rules can use them, and leave the delivery text scan and the report in the rule. The moved code is unchanged apart from export keywords, imports, and createRule calling createOutboxListenerVisitor instead of inlining the listener discovery. The existing tests are unchanged and still pass. fedify-dev#1057 Assisted-by: Claude Code:claude-sonnet-5
The delivery scan splices the text of each used function into the
statement that declares it, replacing the function's range. A method's
range starts right after its key on some parsers, so a body that began
with the delivery call itself fused with the key: `deliver() {
ctx.sendActivity(...); }` scanned as `deliverctx.sendActivity(...)`,
where the context name no longer sits on a word boundary. Under ESLint
that reported a listener that plainly delivers, for a class method, a
static method, an object method, an async one and a getter alike. Deno
was unaffected, and so was a body that began with `return` or `await`,
by luck of the added space.
Surround the spliced text with line breaks, and cover the five method
shapes with tests that fail on Node without the change.
Assisted-by: Claude Code:claude-sonnet-5
A rule that checks how a listener's delivery calls end up needs more than the set of used functions: for each scope it needs the statements that can run and the functions each name holds there. Turn the walk behind computeUsedFunctions() into walkUsedScopes(), which calls a visitor for every scope, and keep computeUsedFunctions() as a wrapper so the existing rule is unchanged. Let collectReferencedNames() optionally cross function boundaries, for callers that need every mention of a name in a listener, and export the helpers a second rule needs. fedify-dev#1057 Assisted-by: Claude Code:claude-sonnet-5
ctx.sendActivity() returns a promise, and an outbox listener that lets it go returns while delivery is still in flight. That usually works out on a long-lived process, but on Cloudflare Workers pending work is dropped once the response is returned, so the activity may never leave. outbox-listener-delivery-required cannot see this: it asks whether a delivery call runs, not whether anything waits for it. The new rule follows the promise of each delivery call up through its parents to where it ends up. It counts as handled when it is awaited, returned, passed to Promise.all() and its siblings, or handed to a waitUntil() method, and void opts a call out. A promise kept in a variable is handled when the variable is mentioned anywhere else, a callback is judged by the call receiving it (forEach() drops what it returns, map() and then() pass it on), and an unawaited call to a local helper that delivers is reported. When it cannot tell where a promise goes, it stays quiet, as outbox-listener-delivery-required does. Deno enables every rule of a plugin as soon as the plugin is listed, so the rule is registered for ESLint and Oxlint only. Its ID stays out of recommendedRuleIds, so the ESLint recommended configuration makes it a warning and strict makes it an error, like every other optional rule. The two outbox rules divide the work between them, and tests pin it down: a listener with a delivery call that can run is never reported by outbox-listener-delivery-required, and one without is never reported by this rule. fedify-dev#1057 Assisted-by: Claude Code:claude-sonnet-5
Add a manual section that says what the rule counts as handled and what it reports, why an unawaited delivery can be lost, and where the rule is available, and link it from outbox-listener-delivery-required, which pointed at the issue instead. List the rule in the package README. fedify-dev#1057 Assisted-by: Claude Code:claude-sonnet-5
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughAdds a lint rule that reports outbox-listener delivery promises classified as dropped. The rule recognizes promise-handling patterns and is registered for ESLint and Oxlint, but not Deno Lint. The existing delivery-required rule now uses shared listener and reachability utilities. ChangesOutbox delivery linting
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Linter
participant ListenerDiscovery
participant PromiseAnalysis
participant RuleReport
Linter->>ListenerDiscovery: Find outbox listener functions
ListenerDiscovery->>PromiseAnalysis: Analyze delivery calls
PromiseAnalysis->>RuleReport: Report calls classified as dropped
Merge Risk: 🟡 Moderate · up to Fix the incorrect loop diagnostics and keep the new rule out of the recommended configuration before merging. The for-of gap also leaves some delivery calls undetected. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The new check can help identify dropped outbox-delivery promises, but it does not itself change delivery at runtime. Its availability and enforcement differ by lint configuration, so it should not be treated as a universal delivery guarantee. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Hardening Proposals
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation The PR implements the main coding requirements in [ Resolution Exclude Full details: Docstring CoverageExplanation Docstring coverage is 73.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 30 functions across 13 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Link the pull request from the changelog entry, now that it is open, as the changelog convention asks. fedify-dev#1067 Assisted-by: Claude Code:claude-sonnet-5
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@packages/lint/src/index.ts`:
- Line 122: Exclude RULE_IDS.outboxListenerDeliveryNotAwaited from
recommendedRules while retaining its strict rule registration; update the
registration assertion and documentation so they no longer claim the recommended
configuration enables this rule.
In `@packages/lint/src/lib/reachability.ts`:
- Around line 156-159: Update the for...of traversal in
collectReachableStatements to inspect evaluated default expressions within
node.left binding patterns, without treating binding names as reads. Preserve
traversal of node.right and node.body so calls in defaults, such as
ctx.sendActivity, are detected.
- Line 144: Update collectReachableStatements to exclude while and for loop
bodies when their tests are statically false; for false-test for loops, also
exclude the update while retaining the initializer and test. Preserve traversal
of a do...while body because it executes once even when its test is false.
In `@packages/lint/src/rules/outbox-listener-delivery-not-awaited.ts`:
- Around line 269-272: In the UnaryExpression handling of the outbox listener
delivery rule, reserve the handled outcome for the void operator; treat other
unary operators as discarded promise uses so calls such as sendActivity under !
or typeof remain reportable, even when the unary result is awaited.
- Around line 375-376: Update the scope collection in the outbox-listener
delivery rule so referenced helper scopes are not treated as executed merely
because their names are mentioned. Only scan delivery calls in the listener and
helper scopes supported by evidence that they can run; preserve the existing
conservative reachability behavior in the delivery-required rule.
- Around line 179-201: The listener-wide alias collection in `visitAll` treats
nested and unused function declarations as if their aliases were visible
everywhere. Update alias resolution in the outbox listener delivery analysis to
associate delivery aliases with their lexical bindings and resolve the binding
visible at each reachable call, so shadowed or unrelated calls are not reported.
- Around line 43-44: Update PROMISE_COMBINATORS to include only methods that
wait for every input promise, removing race and any; update the corresponding
documentation to reflect that handled-combinator behavior.
- Around line 254-256: Update the AwaitExpression handling in the
outbox-listener delivery rule so an inner await inside an async callback is
considered safe only when the callback’s completion is propagated to its caller;
do not suppress the diagnostic for delivery awaited inside a forEach callback
whose promise is discarded.
After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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CHANGES.mdchanges.d/lint/outbox-delivery-not-awaited.mddocs/manual/lint.mdpackages/lint/README.mdpackages/lint/src/index.tspackages/lint/src/lib/const.tspackages/lint/src/lib/outbox-listener.tspackages/lint/src/lib/reachability.tspackages/lint/src/mod.tspackages/lint/src/oxlint.tspackages/lint/src/rules/outbox-listener-delivery-not-awaited.tspackages/lint/src/rules/outbox-listener-delivery-required.tspackages/lint/src/tests/outbox-listener-delivery-not-awaited.registration.test.tspackages/lint/src/tests/outbox-listener-delivery-not-awaited.test.tspackages/lint/src/tests/outbox-listener-delivery-required.test.tspackages/lint/src/tests/outbox-listener-delivery-rules.test.ts
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Thanks for the careful work here, and for splitting it into commits that are easy to follow. The shared module extraction, the ESLint fix in f70a1f0, the registration test and the cross-check between the two rules all look good, and the lint tests pass for me on Deno.
The blocking part is a set of false negatives, where a delivery promise is left in flight and the rule stays quiet. The most important one is forEach(async (x) => { await ctx.sendActivity(...); }), which is likely the most common form of this mistake. Details are in the inline comments.
Review of the new rule found delivery promises left in flight that it let through. An array of promises, such as what map() returns, waits for nothing on its own, yet awaiting or returning it was accepted as if it were one promise. Follow the shape of the value as well as where it goes: an array counts as handled only once it reaches Promise.all() or one of its siblings, or a variable that is mentioned again, and awaiting it or returning it from the listener is reported. An array returned from a helper is left alone, since the helper's caller may pass it to Promise.all(). fateOf() now also says which function the promise ended up in, so a helper that returns or awaits Promise.all() over a map is what carries the delivery, not the map callback inside it, and calling that helper without await is reported. A function that awaits a delivery is judged by where its own promise goes, as a returning callback already was: an async callback given to forEach() is dropped, an immediately invoked one is as safe as the call, one given to map() is as safe as the array, and a function handed over by name, as in forEach(deliver), is judged the same way. A callback given to an unknown function is still left alone. Also treat every unary operator except void as dropping the promise, collect delivery aliases only from the scopes that can run instead of the whole listener, and read a template literal member name from Deno.lint's AST, where reading it as ESTree threw. Promise.race() and Promise.any() stay accepted as a deliberate choice, and a dropped one is pinned by a test. fedify-dev#1067 (review) Assisted-by: Claude Code:claude-sonnet-5
lib/outbox-listener.ts and lib/reachability.ts moved out of outbox-listener-delivery-required with several paths no test reached, which Codecov counted as new uncovered lines. Cover them through the existing rule: a listener held in an object property or behind an alias, one registered after authorize() and onError(), a call that is not a listener registration, and a listener that cannot be resolved; and for the walk, for-in and labeled loops, destructuring patterns that hold functions, and helpers that call each other. fedify-dev#1067 Assisted-by: Claude Code:claude-sonnet-5
Promise.race() and Promise.any() do not wait for the delivery, they are accepted as a deliberate choice to stop waiting, like void, so the manual and the changelog no longer say they wait. Describe the array of promises that map() returns, async callbacks and the operators other than void, and note that the rule leans towards quiet where a name is only mentioned: a stored promise counts as used when its variable is mentioned anywhere, and a helper counts as running once its name is. Drop "opt-in" from the link in outbox-listener-delivery-required, since the ESLint recommended configuration enables the rule as a warning. fedify-dev#1067 (review) Assisted-by: Claude Code:claude-sonnet-5
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- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
In `@packages/lint/src/rules/outbox-listener-delivery-not-awaited.ts`:
- Around line 305-308: Update Shape tracking in fateOf() to distinguish promises
inside object literals, then treat that shape as DROPPED when it reaches
AwaitExpression or a ReturnStatement from the listener; keep helper returns and
all other cases unchanged.
After applying the fix, consider running `coderabbit review --agent` for local
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@dahlia Thank you for the detailed review, and for checking each shape against the branch. All of your inline comments are addressed in bf25197 (rule and tests), ceffc55 (tests for the shared modules) and ef5ffb6 (manual and changelog). Details are in each thread. Beyond those:
The one open question is the helper that returns an array, in the |
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Thanks for the quick and thorough follow-up. Every point from the last round is addressed, and the probes I ran against the previous version are all reported now, with no false positives on the good shapes I tried. The lint tests pass on Deno and Node.js.
Two small changes remain before this can go in: an object literal holding a delivery promise that is awaited or returned from the listener, and a delivery promise in the test position of a conditional expression. Please also add the helper-returned array to the limitations in the manual; the rule change itself is tracked as a follow-up in #1070.
The second review round found two more ways to leave a delivery in
flight without the rule noticing.
An object literal that holds a delivery promise, as in
`await { pending: ctx.sendActivity(...) }`, was read as if it were the
promise itself, but awaiting it waits for nothing inside it, the same as
an array of promises. Follow the object as a shape of its own, so that
awaiting it or returning it from the listener is reported. An object
that a helper returns is left alone, like an array, since the helper's
caller may read the promise back out of it.
A promise used as the test of an if statement, a loop or a conditional
expression was left alone as an unknown consumer, but a promise is
always truthy, so testing one waits for nothing. Report it the way `!`
and `typeof` already are. The test that pinned the old behavior for a
conditional expression now expects the report.
fedify-dev#1067 (review)
Assisted-by: Claude Code:claude-sonnet-5
List what the delivery-not-awaited rule does with an object literal that holds a promise and with a promise used as a test, and add the gap the review asked to have written down: an array of promises, or an object holding one, that a local helper returns is not followed to where the helper is called, so `await deliverAll()` and a bare `deliverAll()` are not reported. Following it is tracked in fedify-dev#1070. fedify-dev#1067 (review) fedify-dev#1070 Assisted-by: Claude Code:claude-sonnet-5
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@dahlia Thank you for the quick review, and for filing #1070 and #1071 so that the remaining edges have a place to go. The three points from this round are addressed in bbc353f (object literals and tested promises, with tests) and 3d5b632 (manual), and each thread has the details. I would appreciate another look when you have time. |
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Thanks for working through three rounds of review so carefully. Everything is addressed, and the rule now catches the shapes that matter most, forEach(async ...) above all, without false positives on the correct shapes I tried. The lint tests pass on Deno and Node.js, and CI is green. The remaining edges are tracked in #1070 and #1071.
2 participants
Closes #1057
The design was agreed with dahlia on the issue: the approach, the rule name, the
void/.catch()/waitUntilsplit, treating callbacks handed to unknown functions as handled, and keeping the rule out of the Deno plugin.Background
ctx.sendActivity()returns a promise, and an outbox listener that lets it go returns while delivery is still in flight. On a long-lived Node.js or Deno process that usually works out, but on Cloudflare Workers pending work is dropped once the response is returned, so the activity may never leave.outbox-listener-delivery-requiredcannot see this: it asks whether a delivery call runs, not whether anything waits for it.Changes
The work is split into commits that each stand on their own and pass the lint package tests:
outbox-listener-delivery-requiredintolib/reachability.tsandlib/outbox-listener.ts, so the new rule can reuse them. No behavior change, and the existing tests are untouched.outbox-listener-delivery-required, found while cross-checking the two rules (see the notes below).computeUsedFunctions()intowalkUsedScopes(), which calls a visitor for every scope, and keepcomputeUsedFunctions()as a wrapper so the existing rule is unchanged.outbox-listener-delivery-not-awaited, with its registration and tests.outbox-listener-delivery-required, list it in the package README and add the changelog fragment.Promise.race()andPromise.any().ifstatement, a loop or a conditional expression, and list the helper-returned array in the limitations of the manual (the rule change itself is tracked in Follow arrays of delivery promises returned by local helpers inoutbox-listener-delivery-not-awaited#1070).How the rule decides
The rule finds each delivery call as a node and follows its promise up through its parents to where it ends up.
Promise.all()orPromise.allSettled(), or handed to a method namedwaitUntil().void,Promise.race()andPromise.any()are accepted as deliberate choices to stop waiting, though arace()orany()whose own result is dropped is still reported, and so is any other operator applied to a promise, or a promise used as the test of anifstatement, a loop or a conditional expression, which is always truthy.map()returns, waits for nothing on its own, and neither does an object literal that holds a promise: awaiting either one, or returning it from the listener, is reported. An array counts as handled once it reachesPromise.all()or one of its siblings, and either one counts as handled when it is kept in a variable that is mentioned again. Returning one from a helper is left alone, since the helper's caller may pass it toPromise.all(), soawait deliverAll()and a baredeliverAll()are not reported whendeliverAll()returns the result ofmap()(tracked in Follow arrays of delivery promises returned by local helpers inoutbox-listener-delivery-not-awaited#1070).outbox-listener-delivery-required..then(),.catch()or.finally()chain is as safe as its result, so a discarded chain is reported.forEach()drops what it returns,map()andthen()pass it on, and an unknown function such assetTimeout()is left alone. Anasynccallback that awaits a delivery is judged the same way, by where the callback goes, soforEach(async ...)is reported, and so is a function passed by name, as inforEach(deliver).outbox-listener-delivery-requireddoes not resolve module-scope delivery helpers #1054.Registration
Deno turns on every rule of a plugin as soon as the plugin is listed, at error severity, so the rule is registered for ESLint and Oxlint only (#1066 tracks the real fix). Its ID is not in
recommendedRuleIds, so the ESLintrecommendedconfiguration makes it a warning andstrictmakes it an error, like every other optional rule. A test pins this down, and it is not added to thefedify initOxlint configuration.Testing
mise run check-each lintmise run test-each lint(Deno and Node.js, 935/935 pass)mise run checkandmise run docs:build(the Twoslash blocks in the new manual section compile)outbox-listener-delivery-requiredaccepts, and one with no delivery call that can run is reported only byoutbox-listener-delivery-required.Notes for review
outbox-listener-delivery-required: under ESLint, a class or object method whose body starts with a bare delivery call was reported as not delivering. The scan splices each used function's text over its range, and a method's range starts right after its key on that parser, sodeliver() { ctx.sendActivity(...); }scanned asdeliverctx.sendActivity(...). Deno was unaffected, and so was a body starting withreturnorawait. The fix surrounds the spliced text with line breaks.waitUntil(). The rule matches a method of that name on any object, since it is the runtime's execution context that provides it, for exampleexecutionCtx.waitUntil()on Cloudflare Workers.outbox-listener-delivery-required. I left that alone and only added the new rule.AI disclosure
This was implemented with Claude Code (
claude-sonnet-5). I picked the issue, agreed the design with dahlia on #1057 and directed the work; Claude Code implemented the rule, the tests and the documentation, found and fixed the ESLint-only false positive while cross-checking the two rules, and ran the checks and tests above on Deno and Node.js. I reviewed the design and the results at each step.