1 files changed, 97 insertions, 0 deletions
diff --git a/packages/turbo-codemod/src/transforms/set-default-outputs.ts b/packages/turbo-codemod/src/transforms/set-default-outputs.ts
new file mode 100644
index 0000000..44f7fd1
--- /dev/null
+++ b/packages/turbo-codemod/src/transforms/set-default-outputs.ts
@@ -0,0 +1,97 @@
+import path from "path";
+import fs from "fs-extra";
+import { getTurboConfigs } from "@turbo/utils";
+import type { Schema as TurboJsonSchema } from "@turbo/types";
+
+import type { TransformerArgs } from "../types";
+import getTransformerHelpers from "../utils/getTransformerHelpers";
+import { TransformerResults } from "../runner";
+
+const DEFAULT_OUTPUTS = ["dist/**", "build/**"];
+
+// transformer details
+const TRANSFORMER = "set-default-outputs";
+const DESCRIPTION =
+  'Add the "outputs" key with defaults where it is missing in `turbo.json`';
+const INTRODUCED_IN = "1.7.0";
+
+function migrateConfig(config: TurboJsonSchema) {
+  for (const [_, taskDef] of Object.entries(config.pipeline)) {
+    if (taskDef.cache !== false) {
+      if (!taskDef.outputs) {
+        taskDef.outputs = DEFAULT_OUTPUTS;
+      } else if (
+        Array.isArray(taskDef.outputs) &&
+        taskDef.outputs.length === 0
+      ) {
+        delete taskDef.outputs;
+      }
+    }
+  }
+
+  return config;
+}
+
+export function transformer({
+  root,
+  options,
+}: TransformerArgs): TransformerResults {
+  const { log, runner } = getTransformerHelpers({
+    transformer: TRANSFORMER,
+    rootPath: root,
+    options,
+  });
+
+  // If `turbo` key is detected in package.json, require user to run the other codemod first.
+  const packageJsonPath = path.join(root, "package.json");
+  // package.json should always exist, but if it doesn't, it would be a silly place to blow up this codemod
+  let packageJSON = {};
+
+  try {
+    packageJSON = fs.readJSONSync(packageJsonPath);
+  } catch (e) {
+    // readJSONSync probably failed because the file doesn't exist
+  }
+
+  if ("turbo" in packageJSON) {
+    return runner.abortTransform({
+      reason:
+        '"turbo" key detected in package.json. Run `npx @turbo/codemod transform create-turbo-config` first',
+    });
+  }
+
+  log.info(`Adding default \`outputs\` key into tasks if it doesn't exist`);
+  const turboConfigPath = path.join(root, "turbo.json");
+  if (!fs.existsSync(turboConfigPath)) {
+    return runner.abortTransform({
+      reason: `No turbo.json found at ${root}. Is the path correct?`,
+    });
+  }
+
+  const turboJson: TurboJsonSchema = fs.readJsonSync(turboConfigPath);
+  runner.modifyFile({
+    filePath: turboConfigPath,
+    after: migrateConfig(turboJson),
+  });
+
+  // find and migrate any workspace configs
+  const workspaceConfigs = getTurboConfigs(root);
+  workspaceConfigs.forEach((workspaceConfig) => {
+    const { config, turboConfigPath } = workspaceConfig;
+    runner.modifyFile({
+      filePath: turboConfigPath,
+      after: migrateConfig(config),
+    });
+  });
+
+  return runner.finish();
+}
+
+const transformerMeta = {
+  name: `${TRANSFORMER}: ${DESCRIPTION}`,
+  value: TRANSFORMER,
+  introducedIn: INTRODUCED_IN,
+  transformer,
+};
+
+export default transformerMeta;