fix(@turbo/codemode): no-op when turbo.json already contains tasks key (

#8471)

packages/turbo-codemod/__tests__/__fixtures__/rename-pipeline/with-tasks/turbo.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "https://turbo.build/schema.json",
+  "tasks": {
+    "build": {
+      "outputs": ["dist"]
+    }
+  }
+}

packages/turbo-codemod/__tests__/rename-pipeline.ts

@@ -139,4 +139,28 @@ describe("rename-pipeline", () => {
       /No turbo\.json found at .*?\. Is the path correct\?/
     );
   });
+
+  it("does not do anything if there is already a top level tasks key", () => {
+    // load the fixture for the test
+    const { root, read } = useFixture({
+      fixture: "with-tasks",
+    });
+
+    // run the transformer
+    const result = transformer({
+      root,
+      options: { force: false, dryRun: false, print: false },
+    });
+
+    expect(JSON.parse(read("turbo.json") || "{}")).toStrictEqual({
+      $schema: "https://turbo.build/schema.json",
+      tasks: {
+        build: {
+          outputs: ["dist"],
+        },
+      },
+    });
+    expect(result.fatalError).toBeUndefined();
+    expect(result.changes).toStrictEqual({});
+  });
 });

packages/turbo-codemod/src/transforms/rename-pipeline.ts

@@ -36,7 +36,14 @@ export function transformer({
     });
   }
 
-  const turboJson: SchemaV1 = loadTurboJson(turboConfigPath);
+  const _turboJson: SchemaV1 | Schema = loadTurboJson(turboConfigPath);
+  if ("tasks" in _turboJson) {
+    // Don't do anything
+    log.info("turbo.json already has a tasks key, exiting");
+    return runner.finish();
+  }
+
+  const turboJson = _turboJson as SchemaV1;
   runner.modifyFile({
     filePath: turboConfigPath,
     after: migrateConfig(turboJson),