How does Atlas prevent breaking Nuxt auto-imports during refactoring?

Atlas uses `lsp`'s `findReferences` to identify all usages of auto-imported `composables/` or `utils/` functions before any changes. This ensures every callsite is accounted for and migrated correctly during the refactor.

Can Atlas refactor server-side Nuxt 3 Nitro handlers?

Yes, Atlas understands the Nuxt 3 server/client split. It can refactor `server/api/` Nitro handlers, mapping their public API surface and ensuring existing tests with `vitest (@nuxt/test-utils)` remain green throughout the process.

What if Atlas tries to apply a patch to a Nuxt file that has changed?

Atlas's `apply_patch` tool anchors on context lines. If a Nuxt `.vue` or `.ts` file has drifted, `apply_patch` will fail with 'Failed to find context', preventing unintended changes to a stale file and requiring manual intervention.

How does Atlas ensure my Nuxt project's code style is maintained?

After making edits to Nuxt `.vue` or `.ts` files, Atlas can be instructed to run `prettier` over the touched files. This ensures your project's formatting standards are consistently applied, maintaining code style without manual effort.

Does Atlas support Nuxt 3's file-based routing when refactoring?

Yes, Atlas is aware of Nuxt's file-based routing in `pages/`. When refactoring components or composables used within routes, Atlas uses `lsp` to track dependencies and ensure no routes are inadvertently broken or misconfigured.

How does Atlas handle `pnpm` workspaces in a Nuxt monorepo?

Atlas operates within the project context. If your Nuxt project uses `pnpm` workspaces, Atlas will execute `pnpm` commands (like `pnpm test`) correctly within that environment, respecting your monorepo setup and ensuring proper dependency resolution.

Can Atlas help move a `fetch` call into `useAsyncData` in Nuxt?

Yes, Atlas can assist with Nuxt-specific refactors like moving a `fetch` call out of a component into `useAsyncData`. This ensures the data fetching runs once during SSR instead of twice, optimizing your Nuxt application's performance.

Refactor a legacy module in Nuxt with Atlas in 2026

Refactoring a legacy Nuxt module without breaking existing callers is achievable with Atlas, which uses `lsp` to map public surfaces, `vitest (@nuxt/test-utils)` to pin behavior, and `apply_patch` for structural changes, ensuring your Nuxt 3 application remains stable and performant in 2026.

How Atlas Maps Nuxt Module Public Surfaces

In 2026, Atlas leverages the `lsp` tool's `documentSymbol` operation to precisely map the public surface of any Nuxt module. This process identifies every exported function, component, or composable, ensuring that all 1,000+ potential callsites are accounted for before any refactoring begins.

To prevent silent breakage, Atlas first uses the `lsp` tool to understand the module's public API. It performs a `documentSymbol` operation on the target Nuxt module file, which enumerates all exported symbols. For each identified symbol, Atlas then executes `findReferences` to locate every single callsite across your Nuxt project. This includes usages within `pages/` for file-based routing, `composables/` for auto-imports, and `server/api/` for Nitro handlers. This comprehensive mapping ensures that Atlas has a complete picture of the module's dependencies and impact, a critical first step before any code modification.

Pinning Nuxt Module Behavior with `vitest (@nuxt/test-utils)`

Before any structural changes, Atlas pins the existing behavior of your Nuxt module by running its tests. Using `bash` to execute `pnpm test`, Atlas records a green baseline from `vitest (@nuxt/test-utils)`, ensuring that the module's functionality is preserved throughout the refactoring process in 2026.

A core principle of safe refactoring is to establish a behavioral baseline. Atlas achieves this by using the `bash` tool to run your existing Nuxt tests. Specifically, it executes `pnpm test`, which invokes `vitest (@nuxt/test-utils)` as configured in your `nuxt.config.ts`. Atlas records the output, confirming that all tests pass before any modifications are made. This 'green baseline' serves as a critical reference point, allowing Atlas to verify that each subsequent change maintains the module's original behavior, preventing regressions in your Nuxt application.

Incremental Refactoring and Safety in Nuxt

Atlas refactors Nuxt modules incrementally using `apply_patch`, ensuring each change is small and verifiable. After every hunk lands, Atlas re-runs `pnpm test` to confirm behavior, and uses `todowrite` to track any remaining 1-to-1 callsite migrations, providing robust safety in 2026.

Structural changes are applied using Atlas's `apply_patch` tool. This tool is designed for safety: it anchors each hunk on context lines and `old_lines`, and will fail with 'Failed to find context' if the target Nuxt `.vue` or `.ts` file has drifted since the patch was generated. This prevents applying changes to an outdated file. Crucially, after each individual hunk is successfully applied, Atlas immediately re-runs `pnpm test` via `bash` to verify that the module's behavior remains unchanged. For complex refactors involving callsite migrations, Atlas uses `todowrite` to maintain a list of remaining tasks, ensuring no callsite is overlooked and preventing a partially migrated module from being mistaken for a finished one.

Reviewing and Committing Nuxt Refactors with Atlas

Atlas provides a transparent review process for all Nuxt refactoring changes. Every file edit generates a unified diff for your approval, and all tool calls are permission-gated. In 2026, Atlas can also run `prettier` over touched `.vue` and `.ts` files, ensuring code style consistency before committing.

Transparency and control are paramount. Atlas computes a unified diff for every file edit, presenting it for your approval before writing any changes to your Nuxt project. Furthermore, every Atlas tool call, including `lsp` or `apply_patch`, is permission-gated against allow, ask, and deny rules, giving you granular control over its actions. After structural changes, Atlas can automatically run `prettier` over the touched `.vue` and `.ts` files, ensuring your Nuxt project's code style is maintained. Once approved, Atlas can stage the changes and create commits on your behalf, integrating direct with your `git` workflow and providing snapshots for easy rollback if needed.

Step by step

01Run Atlas in your Nuxt project with a `nuxt.config.ts` present.
02Ask Atlas to map the module's public surface: `lsp documentSymbol` on the module file, then `findReferences` on each exported symbol to enumerate all callsites in `pages/`, `composables/`, and `server/api/`.
03Pin the module's current behavior: Use `bash` to run `pnpm test` with `vitest (@nuxt/test-utils)` and record the green baseline.
04Instruct Atlas to restructure the module using `apply_patch` for structural changes, ensuring it anchors on context lines.
05After each `apply_patch` hunk lands, use `bash` to re-run `pnpm test` to verify behavior immediately.
06Track any remaining callsite migrations with `todowrite` to ensure a complete refactor.
07Review the unified diffs provided by Atlas for all `.vue` and `.ts` file changes.
08Allow Atlas to run `prettier` over the touched `.vue` and `.ts` files to maintain code style.
09Approve the changes, and let Atlas stage and create a `git` commit on your behalf.

Frequently asked questions

How does Atlas prevent breaking Nuxt auto-imports during refactoring?: Atlas uses `lsp`'s `findReferences` to identify all usages of auto-imported `composables/` or `utils/` functions before any changes. This ensures every callsite is accounted for and migrated correctly during the refactor.
Can Atlas refactor server-side Nuxt 3 Nitro handlers?: Yes, Atlas understands the Nuxt 3 server/client split. It can refactor `server/api/` Nitro handlers, mapping their public API surface and ensuring existing tests with `vitest (@nuxt/test-utils)` remain green throughout the process.
What if Atlas tries to apply a patch to a Nuxt file that has changed?: Atlas's `apply_patch` tool anchors on context lines. If a Nuxt `.vue` or `.ts` file has drifted, `apply_patch` will fail with 'Failed to find context', preventing unintended changes to a stale file and requiring manual intervention.
How does Atlas ensure my Nuxt project's code style is maintained?: After making edits to Nuxt `.vue` or `.ts` files, Atlas can be instructed to run `prettier` over the touched files. This ensures your project's formatting standards are consistently applied, maintaining code style without manual effort.
Does Atlas support Nuxt 3's file-based routing when refactoring?: Yes, Atlas is aware of Nuxt's file-based routing in `pages/`. When refactoring components or composables used within routes, Atlas uses `lsp` to track dependencies and ensure no routes are inadvertently broken or misconfigured.
How does Atlas handle `pnpm` workspaces in a Nuxt monorepo?: Atlas operates within the project context. If your Nuxt project uses `pnpm` workspaces, Atlas will execute `pnpm` commands (like `pnpm test`) correctly within that environment, respecting your monorepo setup and ensuring proper dependency resolution.
Can Atlas help move a `fetch` call into `useAsyncData` in Nuxt?: Yes, Atlas can assist with Nuxt-specific refactors like moving a `fetch` call out of a component into `useAsyncData`. This ensures the data fetching runs once during SSR instead of twice, optimizing your Nuxt application's performance.

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