Return ComponentApi from the test register function (#301)

This lets convex-test's defineTestApp infer the component's API when the
test module is passed directly in its components map.

Author: ianmacartney

src/test.ts

@@ -1,6 +1,8 @@
 /// <reference types="vite/client" />
 import type { TestConvex } from "convex-test";
 import type { GenericSchema, SchemaDefinition } from "convex/server";
+import { componentsGeneric } from "convex/server";
+import type { ComponentApi } from "./component/_generated/component.js";
 import schema from "./component/schema.js";
 import workpool from "@convex-dev/workpool/test";
 const modules = import.meta.glob("./component/**/*.ts");
@@ -9,11 +11,14 @@ const modules = import.meta.glob("./component/**/*.ts");
  * Register the component with the test convex instance.
  * @param t - The test convex instance, e.g. from calling `convexTest`.
  * @param name - The name of the component, as registered in convex.config.ts.
+ * @returns a component api to test via ctx.runMutation or for thick client
+ *   usage. Also provides types for convex-test's defineTestApp.
  */
 export function register<
   Schema extends SchemaDefinition<GenericSchema, boolean>,
 >(t: TestConvex<Schema>, name: string = "workflow") {
   t.registerComponent(name, schema, modules);
   workpool.register(t, `${name}/workpool`);
+  return componentsGeneric()[name] as unknown as ComponentApi;
 }
 export default { register, schema, modules };