feat(cli): assert types for every api block with declared fields

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/cli/src/types.ts

@@ -138,19 +138,20 @@ function apiBlockAssertions(
     for (const block of page.ast.dataApis) {
       if (!block.sections) continue;
 
-      // ssr-mode sectioned blocks can never declare a `request` (they are
-      // render-time only), so they always fall back to the empty-shape
-      // `Record<string, never>` below. `keyof Record<string, never>` is
-      // `string`, which makes the key-exactness arm of AssertAssignable
-      // evaluate to `false` unconditionally and raises TS2344 on every such
-      // block regardless of whether the block author did anything wrong.
-      // We choose to skip emission for both (a) any non-client-mode block,
-      // since it structurally can never have a request to check, and (b) any
-      // block -- client included -- that has zero declared request fields,
-      // since there is nothing to assert type-safety about. This is more
-      // honest about intent than emitting a vacuous/always-failing check.
+      // A block with zero declared request fields would fall back to the
+      // empty-shape `Record<string, never>` below. `keyof Record<string,
+      // never>` is `string`, which makes the key-exactness arm of
+      // AssertAssignable evaluate to `false` unconditionally and raises
+      // TS2344 on every such block regardless of whether the block author
+      // did anything wrong. We skip emission for any block with zero
+      // declared request fields, since there is nothing to assert
+      // type-safety about. This applies regardless of mode: `ssr` blocks can
+      // never declare a `request` and so are always caught by this same
+      // check; mode-less (`any`) and `client` blocks can declare fields and
+      // get an assertion whenever they do. This is more honest about intent
+      // than emitting a vacuous/always-failing check.
       const fields = [...block.sections.parameters, ...block.sections.body];
-      if (block.mode !== "client" || fields.length === 0) continue;
+      if (fields.length === 0) continue;
 
       if (!apiContracts.includes(JSON.stringify(block.path))) {
         console.warn(

packages/cli/test/apis-block-types.test.ts

@@ -0,0 +1,48 @@
+import { afterEach, expect, test } from "bun:test";
+import { mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { generateApplicationTypes } from "../src/types.ts";
+
+const roots: string[] = [];
+afterEach(() => {
+  for (const root of roots.splice(0)) rmSync(root, { recursive: true, force: true });
+});
+
+function fixture(apisBlock: string): string {
+  const root = mkdtempSync(join(tmpdir(), "wrnexus-apis-types-"));
+  roots.push(root);
+  mkdirSync(join(root, "app/pages"), { recursive: true });
+  mkdirSync(join(root, "app/api"), { recursive: true });
+  writeFileSync(
+    join(root, "app/api/users.ts"),
+    `export const POST = async () => Response.json({ users: [] });\n`,
+  );
+  writeFileSync(
+    join(root, "app/pages/search.wrn"),
+    `page Search {\n  apis {\n${apisBlock}\n  }\n\n  view { <main>x</main> }\n}\n`,
+  );
+  return root;
+}
+
+test("a mode-less block with declared fields gets an assertion", () => {
+  const root = fixture(`    searchUsers POST /api/users {
+      request { body { name?: string } }
+      response { return data.users }
+    }`);
+  generateApplicationTypes(root);
+  const generated = readFileSync(join(root, "app/types/wrnexus.generated.api-checks.ts"), "utf8");
+
+  expect(generated).toContain("searchUsers");
+  expect(generated).toContain('ApiInput<"/api/users", "POST">');
+});
+
+test("a block with no declared fields gets no assertion", () => {
+  const root = fixture(`    listAll GET /api/users {
+      response { return data.users }
+    }`);
+  generateApplicationTypes(root);
+  const generated = readFileSync(join(root, "app/types/wrnexus.generated.api-checks.ts"), "utf8");
+
+  expect(generated).not.toContain("listAll");
+});