[talissoncosta]

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• I have read the Contributing Guide.
• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

Contributes to #8832

Stacked on #8819.

The frontend isn't type checked in CI, and main has about 760 type errors. This adds a CI step using tsc-baseline:

• .tsc-baseline.json records today's errors (stories, documentation/ and .storybook/ excluded).
• CI fails on a type error that isn't in the baseline, if it's in web/components/base/ or in a file the PR changed. New errors elsewhere are printed but don't fail.
• After fixing errors, npm run typecheck:baseline shrinks the baseline. Later fix PRs add their folder to the list in the CI step.

Errors are matched by file and message, not line number, so moving code doesn't count as a new error. If tsc exits without reporting any errors (a crash), the step fails rather than passing on empty input.

Before merging: rerun npm run typecheck:baseline on the rebased branch, so errors that landed on main in the meantime are in the baseline.

To bring base/ to zero:

• fixed the type errors in FocusMonitor and ParameterizedRoute
• useOutsideClick and useOverflowVisibleCount accept React 19 nullable refs. Type only, wider than before, so no caller changes: DropdownMenu, ButtonDropdown, InlineModal, UserAction, SegmentOverrideActions, FeatureAction, SegmentAction, AccountDropdown, OverflowNav, Tabs

How did you test this code?

Ran the CI step locally against a fresh npm ci:

• unchanged code passes
• shifting lines in a file with existing errors passes
• a new error in base/Banner fails
• a new error in a file outside base/ that the PR didn't change is reported but passes
• the baseline has no absolute paths
• a tsc run that crashes without output fails the step

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.88%. Comparing base (742715d) to head (1120c1b).

Additional details and impacted files

@@                   Coverage Diff                    @@
##           chore/lint-review-rules    #8826   +/-   ##
========================================================
  Coverage                    98.88%   98.88%           
========================================================
  Files                         1683     1683           
  Lines                        70275    70275           
========================================================
  Hits                         69489    69489           
  Misses                         786      786           

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3 Skipped Deployments

Project	Deployment	Actions	Updated
docs	Ignored	Preview	Oct 22, 2026 8:26am UTC
flagsmith-frontend-preview	Ignored	Preview	Oct 22, 2026 8:26am UTC
flagsmith-frontend-staging	Ignored	Preview	Oct 22, 2026 8:26am UTC