1 files changed, 73 insertions, 0 deletions

diff --git a/packages/create-turbo/src/transforms/official-starter.ts b/packages/create-turbo/src/transforms/official-starter.ts
new file mode 100644
index 0000000..1d71909
--- /dev/null
+++ b/packages/create-turbo/src/transforms/official-starter.ts
@@ -0,0 +1,73 @@
+import path from "path";
+import fs from "fs-extra";
+import semverPrerelease from "semver/functions/prerelease";
+import cliPkgJson from "../../package.json";
+import { isDefaultExample } from "../utils/isDefaultExample";
+import { TransformInput, TransformResult } from "./types";
+import { TransformError } from "./errors";
+
+const meta = {
+  name: "official-starter",
+};
+
+// applied to "official starter" examples (those hosted within vercel/turbo/examples)
+export async function transform(args: TransformInput): TransformResult {
+  const { prompts, example } = args;
+
+  const defaultExample = isDefaultExample(example.name);
+  const isOfficialStarter =
+    !example.repo ||
+    (example.repo?.username === "vercel" && example.repo?.name === "turbo");
+
+  if (!isOfficialStarter) {
+    return { result: "not-applicable", ...meta };
+  }
+
+  // paths
+  const rootPackageJsonPath = path.join(prompts.root, "package.json");
+  const rootMetaJsonPath = path.join(prompts.root, "meta.json");
+  const hasPackageJson = fs.existsSync(rootPackageJsonPath);
+
+  // 1. remove meta file (used for generating the examples page on turbo.build)
+  try {
+    fs.rmSync(rootMetaJsonPath, { force: true });
+  } catch (_err) {}
+
+  if (hasPackageJson) {
+    let packageJsonContent;
+    try {
+      packageJsonContent = fs.readJsonSync(rootPackageJsonPath);
+    } catch {
+      throw new TransformError("Unable to read package.json", {
+        transform: meta.name,
+        fatal: false,
+      });
+    }
+
+    // if using the basic example, set the name to the project name (legacy behavior)
+    if (packageJsonContent) {
+      if (defaultExample) {
+        packageJsonContent.name = prompts.projectName;
+      }
+
+      // if we're using a pre-release version of create-turbo, install turbo canary instead of latest
+      const shouldUsePreRelease = semverPrerelease(cliPkgJson.version) !== null;
+      if (shouldUsePreRelease && packageJsonContent?.devDependencies?.turbo) {
+        packageJsonContent.devDependencies.turbo = "canary";
+      }
+
+      try {
+        fs.writeJsonSync(rootPackageJsonPath, packageJsonContent, {
+          spaces: 2,
+        });
+      } catch (err) {
+        throw new TransformError("Unable to write package.json", {
+          transform: meta.name,
+          fatal: false,
+        });
+      }
+    }
+  }
+
+  return { result: "success", ...meta };
+}