Atlas empowers Three.js developers in 2026 to efficiently triage a wall of red `vitest` output, turning it into a prioritized list of distinct root causes by leveraging its `bash`, `grep`, `todowrite`, and `edit` tools, all while integrating direct with `npm` and `prettier`.
How Atlas runs `vitest` tests in Three.js projects
In 2026, Atlas runs your Three.js `vitest` test suite using its `bash` tool, ensuring even slow tests complete by passing a generous timeout of 60,000 milliseconds. This prevents premature termination and captures the complete output, even if it exceeds 2000 lines.
When working on a Three.js project, your `package.json` likely defines a script for running tests, such as `"test": "vitest"`. Atlas executes this directly, allowing you to run your full `vitest` suite with `atlas bash "npm run test -- --timeout=60000"`. If the output is extensive, Atlas intelligently truncates the terminal display at 2000 lines or 50 KB, but crucially, it writes the entire log to a retained file. This means you always have access to the complete, untruncated `vitest` output, which is essential for diagnosing complex Three.js rendering or memory leak issues that might only appear deep within the log.
Grouping Three.js `vitest` failures by root cause with Atlas
Instead of sifting through hundreds of individual `vitest` failures in your Three.js project, Atlas helps you group them by distinct root causes using its `grep` tool. This approach is vital for logs that can easily exceed 50 KB, allowing you to focus on underlying issues like geometry disposal errors.
A common pitfall in test triage is addressing failures one by one based on test names, which often masks a single underlying problem. For Three.js, this could mean many tests failing due to a single shader compilation error or an incorrect `material.dispose()` call. Atlas's `grep` tool allows you to analyze the complete `vitest` log file, not just the truncated terminal output. You can use `atlas grep "GLSL error" /path/to/full_log.txt` or `atlas grep "memory leak in Scene" /path/to/full_log.txt` to identify patterns. This method helps you quickly identify and consolidate failures stemming from a shared root cause, such as a misconfigured WebGL context or an unhandled resource disposal in your Three.js scene graph, rather than fixing symptoms.
Tracking Three.js test fixes with Atlas `todowrite`
Once you've identified distinct root causes for your Three.js `vitest` failures, Atlas's `todowrite` tool helps you track each one. You can create a pending entry for every unique issue, ensuring that critical fixes, like adding a missing `geometry.dispose()` call, are never forgotten in your 2026 workflow.
After grouping your `vitest` failures, you'll have a concise list of distinct root causes. For instance, you might find a pattern indicating that `BufferGeometry` instances are not being properly disposed of when a Three.js scene unmounts. Instead of relying on memory, use `atlas todowrite "Add dispose path for BufferGeometry in MyScene.js" --status pending`. This creates a trackable entry, ensuring that each identified Three.js-specific problem, whether it's a texture not being freed or a shader program not being deleted, is systematically addressed. This structured approach prevents issues from falling through the cracks and provides a clear roadmap for stabilizing your Three.js application.
Iterative fixing and review for Three.js test failures with Atlas
Atlas streamlines the iterative process of fixing Three.js `vitest` failures. You can use `atlas edit` to modify files like `src/MyScene.js`, re-run only the affected tests with `bash`, and then automatically format your code with `prettier`, all while reviewing a unified diff before committing your changes in 2026.
With a `todowrite` entry in hand, you can begin fixing the root causes. Use `atlas edit src/MyScene.js` to open the relevant Three.js file. For example, if the issue is a missing `material.dispose()` call, you'd add it within your scene's cleanup logic. After making a change, you don't need to re-run the entire `vitest` suite. Instead, use `atlas bash "npm run test -- src/MyScene.test.js"` to target only the relevant tests, getting immediate feedback. Before writing the changes, Atlas computes a unified diff, allowing you to review exactly what will be modified. You can also ensure your Three.js code adheres to project standards by having Atlas run `prettier` on the changes with `atlas bash "npm run prettier -- --write src/MyScene.js"`, which will then present its own diff for approval, maintaining code consistency.
Ensuring code quality and safety in Three.js with Atlas
Atlas prioritizes safety and code quality for Three.js developers in 2026. Every tool call, including running `vitest` or applying `prettier`, is permission-gated, and all proposed file edits are presented as unified diffs for your explicit approval, preventing unintended changes to your critical scene graph logic.
Atlas is designed with developer safety at its core. When Atlas suggests running `vitest` or applying `prettier` to your Three.js codebase, it first drafts a plan in a read-only agent and then asks for your permission before executing any commands. This permission-gated approach means you are always in control. Furthermore, any file modifications, such as adding `geometry.dispose()` calls or refactoring a `requestAnimationFrame` loop to use reusable `Vector3` instances, are presented as a clear, unified diff. You can review these changes, understand their impact on your Three.js scene, and either approve or reject them before they are written to disk. This robust review process, combined with Atlas's ability to snapshot changes as git patches for easy rollback, provides a secure environment for maintaining and improving your Three.js projects.
Step by step
- 01Run your Three.js `vitest` suite with Atlas, ensuring a generous timeout: `atlas bash "npm run test -- --timeout=60000"`.
- 02If the `vitest` output was truncated, read the complete log file path provided by Atlas to see all Three.js failures.
- 03Group the Three.js `vitest` failures by distinct root cause using `atlas grep "error pattern" /path/to/full_log.txt` on the saved log.
- 04Record each distinct Three.js root cause as a pending task: `atlas todowrite "Fix missing material.dispose() in Scene.js" --status pending`.
- 05Use `atlas edit src/MyScene.js` to open the relevant Three.js file and implement the fix for a root cause.
- 06Re-run only the affected `vitest` tests to confirm the Three.js fix: `atlas bash "npm run test -- src/MyScene.test.js"`.
- 07Format your modified Three.js code with `prettier` via Atlas: `atlas bash "npm run prettier -- --write src/MyScene.js"`.
- 08Review the unified diff presented by Atlas for your Three.js code changes and approve them.
Frequently asked questions
- How does Atlas handle large `vitest` output from my Three.js project?
- Atlas truncates large `vitest` output in the terminal but always saves the complete log to a retained file, providing you with the full context for Three.js error analysis.
- Can Atlas help me find Three.js memory leaks reported by `vitest`?
- Yes, by using `atlas grep` on the full `vitest` log, you can identify patterns related to Three.js memory leaks, such as un-disposed geometries or materials, and group them by root cause.
- What Three.js-specific tools does Atlas integrate with?
- Atlas integrates directly with the standard Three.js toolchain, including `vitest` for testing, `npm` for package management, and `prettier` for code formatting.
- How does Atlas ensure I don't accidentally break my Three.js codebase?
- Atlas uses permission-gated tool calls and presents all proposed file edits as unified diffs for your explicit approval, ensuring you maintain full control over changes to your Three.js project.
- Can Atlas run specific `vitest` tests in my Three.js project?
- Absolutely. You can use `atlas bash "npm run test -- src/MyComponent.test.js"` to run only the relevant `vitest` files after making changes to your Three.js code.
- Does Atlas understand Three.js scene graph structures or GLSL code?
- Atlas indexes code by AST declarations using tree-sitter, allowing it to understand the structure of your Three.js scene graphs, materials, and even inline GLSL shader strings for more intelligent assistance.
- How does Atlas help maintain code style in my Three.js project?
- Atlas integrates with `prettier`. After making edits, you can run `atlas bash "npm run prettier -- --write src/MyScene.js"` to automatically format your Three.js code and review the changes before committing.
Try Atlas in your terminal
The terminal-native AI coding agent. Free core, single binary.
Install AtlasRelated guides
Run the Test Suite and Triage the Failures with Atlas in 2026
How to triage a failing test suite with Atlas in 2026: bash truncates at 2000 lines or 50 KB and saves the full log, then grep groups failures by root cause.
Atlas for Three.js: Terminal-Native AI Coding for Scenes, Materials, and Disposal in 2026
Atlas is a terminal-native AI coding agent for Three.js in 2026, where geometry, material, and texture disposal is the difference between a demo and a leak.
Automate GitHub Issue and Pull Request Triage in Three.js with Atlas in 2026
Streamline Three.js project maintenance in 2026. Atlas automates GitHub issue and pull request triage, ensuring safe, trusted responses for your Three.js codebase.
Refactor a legacy Three.js module with Atlas in 2026
Safely refactor legacy Three.js modules in 2026 with Atlas. Map callsites, pin behavior with vitest, apply changes with apply_patch, and ensure no regressions.
Onboard to an Unfamiliar Three.js Codebase with Atlas in 2026
Quickly build a mental model of any Three.js repository in 2026 using Atlas. Leverage semantic search, file globbing, and read-only exploration to understand scene graphs, materials, and render loops without reading
Diagnose a hanging or long-running command in Three.js with Atlas in 2026
In 2026, use Atlas to diagnose why your Three.js `npm` or `vitest` commands are hanging or running slowly. Identify if a process is genuinely slow or silently blocked on interactive input, and get it unstuck with
Locate Three.js Behavior Implementations with Atlas in 2026
Discover how Atlas helps Three.js developers in 2026 pinpoint exact file and symbol locations for behaviors, leveraging semantic search, grep, and LSP tools.
Rename a symbol across the repo in Three.js with Atlas in 2026
Refactor Three.js code with Atlas in 2026. Rename functions, classes, or constants across your entire repository, ensuring all references are updated, including those missed by `grep` alone. Atlas uses `lsp`, `grep`