lint-staged doesnt actually support async, their github lies

bin/git-hooks/pre-commit

@@ -7,11 +7,12 @@ if \git --no-pager diff-index -z --name-only --no-renames --cached HEAD | \
   \grep -qzE '\.(json|scss|ts)$'; then
   # NOTE! grep must be kept in sync with lint-staged in package.json!
 
-  LINT_STAGED="$(dirname -- "$0")/../../node_modules/.bin/lint-staged"
+  BIN_DIR="$(dirname -- $0)/.."
+  LINT_STAGED="$BIN_DIR/../node_modules/.bin/lint-staged"
 
   # pnpm or npx adds .25s overhead. exec further reduces overhead.
   if [ -x "$LINT_STAGED" ]; then
-    exec "$LINT_STAGED"
+    exec "$LINT_STAGED" --config "$BIN_DIR/lint-staged.config.mjs"
   else
     exec pnpm lint-staged
   fi

bin/lint-staged.config.mjs

@@ -1,19 +1,8 @@
-import { lstat } from 'fs/promises';
-
-async function filterSymlinks(files) {
-  const checks = await Promise.all(
-    files.map(async file =>
-      lstat(file)
-        .then(s => s && !s.isSymbolicLink() && file)
-        .catch(() => null),
-    ),
-  );
-  return checks.filter(Boolean);
-}
+import { lstatSync } from 'fs';
 
 export default {
-  '*.{json,scss,ts}': async files => {
-    const regularFiles = await filterSymlinks(files);
+  '*.{json,scss,ts}': files => {
+    const regularFiles = files.filter(f => !lstatSync(f).isSymbolicLink());
     return regularFiles.length ? `prettier --write ${regularFiles.join(' ')}` : 'true';
   },
 };