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It never edits your code — it emits [`codemod:metrics`](https://docs.codemod.com/jssg/metrics) you can use to scope, prioritize, and track the migration route-by-route. See [`CASES.md`](./CASES.md) for the full design rationale behind each probe. ## What it collects Each metric is grouped by cardinality dimensions so you can slice the results (e.g. all `router.query` usages, or every file bucketed as `manual`). | Metric | Dimensions | Captures | | ------ | ---------- | -------- | | `nextjs-file-kind` | `kind` | `page` / `api-route` / `app-entry` / `document` (from path) | | `nextjs-data-fetching` | `fn`, `wrapped` | `getServerSideProps` / `getStaticProps` / `getStaticPaths` / `getInitialProps`; `wrapped=true` for wrapper calls, `reexport` for `export { x as getServerSideProps }` | | `nextjs-data-context` | `fn`, `prop` | context props read (`params`, `query`, `req`, `res`, `preview`, `locale`, …) | | `nextjs-data-return` | `fn`, `shape` | return shapes (`props`, `redirect`, `notFound`, `revalidate`, `fallback`, `paths`) | | `nextjs-router-import` | `name` | `default` (`Router`) / `useRouter` / `withRouter` / `NextRouter` from `next/router` | | `nextjs-router-usage` | `member` | member accessed on a resolved router instance (`push`, `query`, `pathname`, `asPath`, …) | | `nextjs-router-risk` | `pattern` | higher-risk usage: `push-object`, `shallow-routing`, `events`, `beforePopState` | | `nextjs-client-reason` | `category`, `name` | why a file needs `"use client"`: `hook` / `global` / `jsx-handler` / `context` / `class` | | `nextjs-head` | `kind` | `next/head` contents: `import` / `static-title` / `static-meta` / `dynamic` / `script` / `other` | | `nextjs-pages-type` | `name` | Pages-specific type imports (`NextPage`, `GetServerSideProps`, `AppProps`, …) | | `nextjs-api-type` | `name` | `NextApiRequest` / `NextApiResponse` / `NextApiHandler` | | `nextjs-api-method` | `method` | HTTP method dispatch (`GET`, `POST`, …) from `req.method` checks / `switch` | | `nextjs-api-req` | `member` | request members used (`query`, `body`, `cookies`, `headers`, `socket`) | | `nextjs-api-res` | `member` | response members used (`status`, `json`, `send`, `end`, `redirect`, `write`, …) | | `nextjs-layout` | `pattern` | `getLayout` / `layout` / `Layout` per-page layouts; `app-component` (``) | | `nextjs-test-mock` | `target` | `jest.mock` / `vi.mock` of `next/router`, `next/head`, `next/navigation` | | `nextjs-migration-bucket` | `file`, `bucket` | per-file difficulty: `deterministic` / `ast-assisted` / `manual` | The **`nextjs-migration-bucket`** metric is the headline: it classifies each Next-related file into a migration difficulty bucket. `manual` is set when a file uses `getInitialProps`, a wrapped data function, risky router APIs (`events` / `beforePopState` / object `push` / shallow routing), streaming API responses (`res.write` / `res.revalidate`), or `