feat(generators): wire trpc entry + e2e test

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

turbo/generators/__tests__/core-package-trpc.e2e.test.ts

@@ -0,0 +1,51 @@
+import { describe, it, expect } from "vitest";
+import { mkdtempSync, cpSync, readFileSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { execSync } from "node:child_process";
+import { join, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+import { computeSnapshot } from "../lib/snapshot";
+import expectedSnapshot from "../__snapshots__/core-package/trpc.snapshot.json";
+
+// Repo root is 2 levels up from turbo/generators/__tests__
+const REPO_ROOT = resolve(fileURLToPath(import.meta.url), "..", "..", "..", "..");
+
+/**
+ * Strip "@repo/core-trpc" from a package.json file in the tmp tree.
+ * Required when simulating a fresh scaffold: core-trpc does not exist yet
+ * but the snapshot was captured before removal. Apps in the current tree
+ * still list it as a dependency.
+ */
+function stripCoreTrpcDep(pkgJsonPath: string): void {
+  const raw = readFileSync(pkgJsonPath, "utf8");
+  const parsed = JSON.parse(raw) as Record<string, Record<string, string>>;
+  for (const section of ["dependencies", "devDependencies", "peerDependencies"] as const) {
+    if (parsed[section]?.["@repo/core-trpc"]) {
+      delete parsed[section]["@repo/core-trpc"];
+    }
+  }
+  writeFileSync(pkgJsonPath, JSON.stringify(parsed, null, 2) + "\n");
+}
+
+describe("e2e: core-package trpc", () => {
+  it("byte-identical reconstruction matches snapshot", { timeout: 120_000 }, () => {
+    const tmp = mkdtempSync(join(tmpdir(), "e2e-trpc-"));
+    cpSync(REPO_ROOT, tmp, {
+      recursive: true,
+      filter: (src) =>
+        !src.includes("node_modules") &&
+        !src.includes(".turbo") &&
+        !src.includes("packages/core-trpc"),
+    });
+
+    // Strip @repo/core-trpc from app package.json files so pnpm install
+    // succeeds without the package being present (simulating the post-removal state).
+    stripCoreTrpcDep(join(tmp, "apps", "web-next", "package.json"));
+    stripCoreTrpcDep(join(tmp, "apps", "web-tanstack", "package.json"));
+
+    execSync(`cd ${tmp} && pnpm install --frozen-lockfile=false`, { stdio: "ignore" });
+    execSync(`cd ${tmp} && pnpm turbo gen core-package --args trpc`, { stdio: "ignore" });
+    const result = computeSnapshot(join(tmp, "packages/core-trpc"));
+    expect(result).toEqual(expectedSnapshot);
+  });
+});

turbo/generators/config.ts

@@ -642,6 +642,18 @@ import noRealtimeHandlerReexport from "./rules/no-realtime-handler-reexport.js";
         },
         printEventsNextSteps,
       ],
+      trpc: () => [
+        () => {
+          assertOptionalPackageNotPresent("core-trpc");
+          return "Guard passed — packages/core-trpc does not exist yet.";
+        },
+        ...emitTemplateTree("core-package/trpc", "packages/core-trpc"),
+        () => {
+          addToTranspilePackages("apps/web-next/next.config.mjs", "@repo/core-trpc");
+          return "Added @repo/core-trpc to transpilePackages.";
+        },
+        printTrpcNextSteps,
+      ],
     };
 
   plop.setGenerator("core-package", {
@@ -651,7 +663,7 @@ import noRealtimeHandlerReexport from "./rules/no-realtime-handler-reexport.js";
         type: "list",
         name: "name",
         message: "Which optional core package?",
-        choices: ["realtime", "events"],
+        choices: ["realtime", "events", "trpc"],
       },
     ],
     actions: (answers) => {
@@ -1146,6 +1158,35 @@ function printHandlerNextSteps(a: {
   ].join("\n");
 }
 
+function printTrpcNextSteps(): string {
+  return [
+    "─────────────────────────────────────────────────────────────",
+    "@repo/core-trpc scaffolded.",
+    "",
+    "Next steps (manual wiring — not generated):",
+    "",
+    "  1. pnpm install   # link the new workspace package",
+    "",
+    "  2. apps/web-next/src/app/providers.tsx:",
+    '     - import { NextTrpcProvider } from "@repo/core-trpc/next";',
+    "     - wrap children: <NextTrpcProvider trpcUrl=\"/api/trpc\">{children}</NextTrpcProvider>",
+    "",
+    "  3. apps/web-next/src/app/api/trpc/[trpc]/route.ts:",
+    '     - import { fetchRequestHandler } from "@trpc/server/adapters/fetch";',
+    '     - import { appRouter } from "@repo/core-api";',
+    "     - export GET and POST handlers using fetchRequestHandler",
+    "",
+    "  4. apps/web-tanstack/src/routes/__root.tsx:",
+    '     - import { TanstackTrpcProvider } from "@repo/core-trpc/tanstack";',
+    "     - wrap <Outlet /> with <TanstackTrpcProvider trpcUrl=\"http://localhost:3000/api/trpc\">",
+    "",
+    "  5. Add @repo/core-trpc to apps/web-next/package.json and apps/web-tanstack/package.json dependencies",
+    "",
+    "  6. pnpm typecheck && pnpm lint && pnpm test",
+    "─────────────────────────────────────────────────────────────",
+  ].join("\n");
+}
+
 function printEventsNextSteps(): string {
   return [
     "─────────────────────────────────────────────────────────────",