Atlas empowers Bun developers in 2026 to review pull requests with the same rigor as a careful human, leveraging Bun's integrated toolchain. It fetches the branch, reads full files, checks changed signatures with LSP, and runs `bun test` and `bun fmt` behind permission prompts, ensuring comprehensive context beyond a simple diff.
How Atlas reviews Bun pull requests for deep context
In 2026, Atlas reviews Bun pull requests by first fetching the branch and producing a raw diff using its VCS layer, then immediately moving beyond the diff. It reads the full changed files, not just hunks, to provide 100% of the surrounding context needed to catch subtle bugs.
Atlas's approach to reviewing a Bun pull request mirrors a meticulous human reviewer. Instead of relying solely on the `git diff` output, Atlas uses its `bash` tool to fetch the relevant branch and generate the initial diff. Crucially, it then employs its `read` tool to pull the *entire* content of changed files. This ensures that the AI agent has complete visibility into the code, including lines that might be just outside the diff hunks but are critical for understanding the change's impact. For instance, if a `package.json` script is modified, Atlas reads the whole file to understand its relationship to other scripts or dependencies, rather than just the changed lines. This deep contextual understanding is vital for identifying issues that a line-by-line review would inevitably miss, especially in a fast-paced Bun project where iteration is nearly instant.
Verifying Bun API changes and dependencies with Atlas
Atlas ensures the integrity of Bun API changes by using the `lsp` tool to `findReferences` for every modified function signature, even if the diff shows only 1 line changed. This proactive check identifies any callers in the codebase that the pull request's diff might not have touched, preventing unexpected breakages.
When a Bun developer modifies a function signature, such as a `Bun.serve` handler or a utility function interacting with `Bun.file`, Atlas goes beyond the diff. It utilizes its `lsp` tool to perform a `findReferences` operation on every changed signature. This is critical because a diff might only show the modification in one file, but the change could impact dozens of call sites across the project. For example, if a parameter is added to a function used by multiple `bun:sqlite` queries, Atlas will identify all those call sites, allowing the agent to flag potential issues or suggest necessary updates. Furthermore, Atlas can analyze the `bun.lock` and `package.json` files to understand dependency changes, ensuring that `bun install` would still resolve correctly and that no new vulnerabilities are introduced. This comprehensive approach ensures that the Bun project's stability is maintained, even with complex refactors.
Catching missed updates and running Bun tests with Atlas
Atlas proactively identifies missed updates by using the `grep` tool to search for patterns that *should* have been updated but weren't, such as old constant names or feature flags, ensuring 100% consistency. After this, it runs `bun test` to confirm functional correctness.
A common pitfall in code reviews is missing updates to related code that isn't directly part of the diff. Atlas addresses this by employing its `grep` tool to search for specific patterns. For instance, if a constant name like `DEFAULT_PORT` is changed in one file, Atlas can `grep` the entire codebase for the old name to ensure all references have been updated. This is particularly useful in Bun projects where configuration might be spread across multiple files or used in various `package.json` scripts. Following this, Atlas leverages the `bash` tool to execute `bun test`. This command, central to the Bun ecosystem, runs the project's test suite. Atlas presents a permission prompt before running `bun test`, allowing the developer to approve the action. Because Bun's test runner is incredibly fast, Atlas can iterate quickly on test failures, providing rapid feedback and reporting findings as a `todowrite` list ordered by severity, making the review process highly efficient.
Ensuring Bun code style and safety with Atlas
Atlas ensures Bun code adheres to project style guidelines by running `bun fmt` over the diff, catching any formatting inconsistencies before a commit is approved. This process is permission-gated, providing the developer with 100% control over automated actions.
Maintaining consistent code style is crucial for collaboration in any Bun project. Atlas integrates directly with `bun fmt`, Bun's native formatter, to ensure that all changes in a pull request conform to the project's established style. Before a commit is approved, Atlas can run `bun fmt` specifically over the modified files or the entire diff. This prevents style-related comments in code reviews and ensures a clean, readable codebase. Atlas's robust permission system means that every tool call, including `bun fmt` or `bun install`, is permission-gated against `allow`, `ask`, and `deny` rules. This gives the Bun developer complete control, ensuring that Atlas only performs actions with explicit approval. Furthermore, Atlas drafts a plan in a read-only plan agent and asks for approval before switching to a build agent, and it computes a unified diff for every file edit, surfacing it for approval before writing. This multi-layered safety mechanism ensures that automated actions enhance, rather than hinder, the developer's workflow.
Step by step
- 01Fetch the Bun branch and generate the diff with Atlas's VCS layer. Atlas uses its internal VCS layer to expose `status`, `diff`, `diffRaw`, and `commits` over your `git` data, allowing it to fetch the specific branch for review.
- 02Read the full changed Bun files for complete context. Atlas employs the `read` tool to pull the entire content of modified files, not just the diff hunks, ensuring visibility into surrounding code in your Bun project.
- 03Check Bun API signature changes with `lsp findReferences`. For every changed function signature, such as in `Bun.serve` or `bun:sqlite` interactions, Atlas uses the `lsp` tool's `findReferences` operation to identify all callers, even those outside the immediate diff.
- 04`grep` for missed updates in your Bun codebase. Atlas uses the `grep` tool to search for patterns like old constant names or feature flags that should have been updated but were missed across your Bun project files.
- 05Run `bun test` to validate functional changes. Atlas executes `bun test` via the `bash` tool, behind a permission prompt, to run your project's test suite and quickly iterate on any failures.
- 06Apply `bun fmt` over the diff for style consistency. Before approving the commit, Atlas can run `bun fmt` using the `bash` tool over the modified files to ensure all changes adhere to your Bun project's formatting standards.
- 07Review Atlas's `todowrite` list of findings. Atlas reports all identified issues and suggestions as a `todowrite` list, ordered by severity, for the Bun developer to review and act upon.
Frequently asked questions
- How does Atlas ensure it understands my Bun project's specific APIs?
- Atlas is designed to read your Bun-native APIs like `Bun.serve`, `Bun.file`, and `bun:sqlite`, along with scripts in `package.json`, to build a comprehensive understanding of your project.
- Can Atlas replace Node.js compatibility shims with native Bun APIs?
- Yes, you can ask Atlas to replace Node compatibility shims with native Bun APIs and then confirm the behavior with `bun test` to ensure correctness.
- How does Atlas handle running `bun test` and other commands?
- Atlas runs `bun test` and other commands like `bun fmt` via its `bash` tool, always behind a permission prompt, giving you full control over execution.
- What safety mechanisms does Atlas have for making changes?
- Atlas drafts a plan in a read-only plan agent, asks for approval before switching to a build agent, and computes a unified diff for every file edit, surfacing it for approval before writing.
- Does Atlas keep my Bun code local?
- Yes, Atlas can build its code index with local Ollama embeddings, ensuring your Bun code remains off third-party servers.
- How does Atlas ensure code style in Bun projects?
- Atlas integrates with `bun fmt`, running it over the diff before you approve a commit, to ensure all changes adhere to your Bun project's formatting standards.
- Can Atlas help with `bun install` issues during review?
- While Atlas doesn't directly run `bun install` as part of a standard review, it can analyze `bun.lock` and `package.json` for dependency changes and flag potential issues, and can be prompted to run `bun install` if needed, behind a permission prompt.
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