fix(ci): check authored documentation code

Co-authored-by: Kaoru0822 <208281322+kaoru0822-kitauji@users.noreply.github.com>

scripts/ci/plan.mjs

@@ -175,6 +175,8 @@ if (tier === "reused") {
         file.startsWith(".github/ISSUE_TEMPLATE/")
       ) {
         selected.docs = true;
+        // Authored documentation code also belongs to the static checkers.
+        selected.code ||= /^docs\/.*\.(?:[cm]?[jt]s|[jt]sx)$/u.test(file);
         selected.website ||= matchesAny(file, SCOPES.website);
         continue;
       }

tests/boundary/filesystem/ciChangeScope.test.ts

@@ -144,6 +144,38 @@ it("keeps every translated README and authored guide on the documentation lane",
   });
 });
 
+it.each(["cjs", "cts", "js", "jsx", "mjs", "mts", "ts", "tsx"])(
+  "selects static checks for authored documentation code (%s) without provider lanes",
+  async (extension) => {
+    const { directory, base } = await fixture();
+    const head = await change(directory, [
+      `docs/.vitepress/helpers/navigation.${extension}`,
+    ]);
+    const plan = await classify(directory, base, head);
+    const { CI_FLAGS } = await loadScopes();
+    expect(plan).toMatchObject({ tier: "fast", code: true, docs: true });
+    for (const flag of CI_FLAGS)
+      if (flag !== "code" && flag !== "docs") expect(plan[flag]).toBe(false);
+  },
+);
+
+it("retains code checks when documentation code is removed or renamed to Markdown", async () => {
+  const { directory } = await fixture();
+  const base = await change(directory, ["docs/.vitepress/config.ts"]);
+  await git(directory, [
+    "mv",
+    "docs/.vitepress/config.ts",
+    "docs/configuration.md",
+  ]);
+  const head = await commit(directory);
+  expect(await classify(directory, base, head)).toMatchObject({
+    code: true,
+    docs: true,
+    runtime: false,
+    package: false,
+  });
+});
+
 it.each([
   "job-timings.mjs",
   "job-timings-batch.mjs",
@@ -937,7 +969,7 @@ it.each([
     "tsconfig.build.json",
     { code: true, package: true, browser: true, evm: true },
   ],
-  ["docs/.vitepress/config.ts", { code: false, docs: true, package: false }],
+  ["docs/.vitepress/config.ts", { code: true, docs: true, package: false }],
   ["CHANGELOG.md", { code: false, docs: true, package: false }],
   ["SECURITY.md", { code: false, docs: true, package: false }],
   [".github/pull_request_template.md", { code: false, docs: true }],