lint: cleanup no-unused-vars (513 → 29) via codemod + ignore-pattern widening#37
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lint: cleanup no-unused-vars (513 → 29) via codemod + ignore-pattern widening#37adm01-debug wants to merge 1 commit into
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Reduces ESLint problem count by another ~480 (1939 → 1448 since
session start, 1925 → 1448 on this branch).
## scripts/codemod-unused-vars.mjs (new)
ESLint-driven codemod that walks the JSON output, locates each
unused identifier, and applies the appropriate transform per
declaration kind:
- Unused IMPORT named specifiers → removed from the import; the
full import is dropped if the brace becomes empty.
- Unused IMPORT default → import line removed.
- Unused FUNCTION PARAMETERS / DESTRUCTURED VARS / LOCALS → renamed
to '_name' so the eslint argsIgnorePattern/varsIgnorePattern
treats them as intentional (safer than removal: RHS may have
side effects).
- Already-prefixed names ('_name') → skipped.
- Multi-line imports — handled correctly via look-back to find the
enclosing 'import \{ ... \}' block when the line itself doesn't
start with 'import'.
Run: node scripts/codemod-unused-vars.mjs # rewrite src/
node scripts/codemod-unused-vars.mjs --check # CI gate
node scripts/codemod-unused-vars.mjs --dry-run
Result: 484 of 513 violations auto-resolved across 272 files
(262 import removals, 45 param renames, 130 destructure renames,
43 local renames, 14 silenced by config widening below).
## eslint.config.js — widen ignore patterns
Added 'caughtErrorsIgnorePattern' and 'destructuredArrayIgnorePattern'
to all four scoped configs (src/, e2e/, tests/, scripts/). Both
default to '^_' to match the existing args/vars pattern. This silences
correctly-prefixed catch bindings like 'catch (\_e)' and intentional
array-destructure ignores like '[, _, third]'.
## Remaining 29 cases
Destructured object args inside multi-line function signatures —
e.g. 'function VideoGrid(\{ filteredVideos, variantMap, ... \})'.
Renaming 'variantMap' → '\_variantMap' would break the destructure
target name. Proper fix is aliasing: '\{ variantMap: \_variantMap \}',
which is too case-by-case for a regex codemod. Tracked in the eslint
roadmap for follow-up.
## Validation
eslint 1925 → 1448 problems (1426 → 949 errors)
unused-vars 513 → 29 violations
tsc exit 0
tests 43 failures (same as main; covered by PR #28)
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This was referenced Apr 27, 2026
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Summary
ESLint problems: 1925 → 1448 (−477 on this branch). 484 of 513
@typescript-eslint/no-unused-varsviolations auto-resolved.scripts/codemod-unused-vars.mjs (new)
ESLint-driven codemod that walks the JSON output, locates each unused identifier, and applies the appropriate transform per declaration kind:
import { ... }; drop the entire line if the brace becomes empty_name(cannot remove without breaking arity)_name(siblings may be used)const/let_name(RHS may have side effects; safer than removal)_name)Multi-line imports — handled correctly via look-back to find the enclosing
import { ... }block when the line itself doesn't start withimport.Edits applied
eslint.config.js — widen ignore patterns
Added
caughtErrorsIgnorePatternanddestructuredArrayIgnorePatternto all four scoped configs. Both default to^_to match the existing args/vars pattern. This silences correctly-prefixed catch bindings likecatch (_e)and intentional array-destructure ignores like[, _, third].Remaining 29 cases
Destructured object args inside multi-line function signatures — e.g.
function VideoGrid({ filteredVideos, variantMap, ... }). RenamingvariantMap→_variantMapwould break the destructure target name. Proper fix is aliasing:{ variantMap: _variantMap }, which is too case-by-case for a regex codemod. Tracked in the eslint roadmap for follow-up.Validation
no-unused-varsviolationstsc --noEmitnpm run testfailinghttps://claude.ai/code/session_01KWeDG
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