How does Atlas know if my `pnpm` build is slow or blocked in React?

Atlas's `bash` tool races your `pnpm` command against a timeout. If it expires, Atlas analyzes the process state to explicitly report whether it was genuinely slow or silently blocked on interactive input, a common issue in React development.

Can Atlas help with a hanging `Vitest with React Testing Library` run?

Yes, run your `Vitest` command via `atlas bash 'pnpm test'`. Atlas will diagnose if it's blocked on input, suggesting flags like `--no-input`, or if it's genuinely slow, prompting you to increase the timeout.

What if Atlas suggests modifying my `package.json` for a React script?

Atlas drafts a plan in a read-only agent and computes a unified diff for any file edits, including `package.json`. You must approve this diff before Atlas writes any changes, ensuring full control over your React project.

Does Atlas support `prettier` formatting commands in React projects?

Absolutely. If your `prettier` command, like `atlas bash 'pnpm format'`, hangs, Atlas will diagnose if it's waiting for input or genuinely slow, guiding you to resolve the issue with appropriate flags or timeouts.

How does Atlas ensure my React code stays private when diagnosing?

Atlas can build its code index with local Ollama embeddings, keeping your React code off third-party servers. All tool calls are permission-gated, and file changes are presented as diffs for your approval.

What if I accidentally abort a command in Atlas while debugging a React issue?

If you manually interrupt a command, Atlas's `shell_metadata` block will explicitly state 'User aborted the command,' distinguishing your action from a timeout or a command blocked on input.

Can Atlas handle long-running `pnpm run dev` processes for React development?

Yes, for `pnpm run dev` or similar long-running processes, Atlas can execute them via `atlas bash`. If they exceed a default timeout, Atlas will diagnose the cause and allow you to retry with a larger timeout, or identify if it's blocked.

Is Atlas compatible with my existing React toolchain like Vite or Next.js?

Yes, Atlas is designed to work direct with React apps, from components and hooks to a Vite or Next.js build. It reads your `package.json` and bundler configuration to understand your project context.

Diagnose a hanging or long-running command in React with Atlas in 2026

In 2026, React developers can use Atlas to quickly diagnose whether a pnpm script, Vitest with React Testing Library run, or prettier formatting command is genuinely slow or silently blocked on interactive input, providing clear instructions to unblock the process and resume development.

How to diagnose a hanging pnpm script in a React project

In 2026, diagnosing a hanging pnpm script in a React project begins with Atlas's bash tool. This tool executes your command and, if it exceeds a default timeout, provides a shell_metadata block detailing whether the process was genuinely slow or silently blocked on interactive input, a common issue with pnpm installs.

When a `pnpm` command, such as `pnpm install` or `pnpm run build`, appears to hang in your React project, Atlas provides immediate clarity. By running the command through `atlas bash 'pnpm install'`, Atlas races the execution against a timeout. If the command does not complete within the allotted time, Atlas's output includes a `shell_metadata` block. This block explicitly states whether the command 'timed out' because it was genuinely slow, or if it was 'blocked on interactive input'. This distinction is crucial for React developers, as a blocked command will never resolve by simply waiting, while a slow command requires a larger timeout. Atlas's ability to index code by AST declarations using tree-sitter helps it understand the context of your `package.json` scripts, even when they involve complex React build configurations.

Identifying blocked Vitest tests or prettier formatting in React

A common scenario in 2026 involves Vitest with React Testing Library or prettier commands appearing to hang, often due to unexpected interactive prompts. Atlas's diagnostic output clearly indicates when a command is blocked on input, allowing React developers to quickly identify and apply non-interactive flags like --no-input or CI mode.

React developers frequently encounter situations where `Vitest with React Testing Library` runs or `prettier` formatting commands seem to freeze. For instance, executing `atlas bash 'pnpm test'` might result in a timeout. Atlas's `shell_metadata` will then specify if the `Vitest` process was 'blocked on interactive input'. This often happens when a test runner or formatter unexpectedly prompts for user confirmation. To resolve this, Atlas instructs you to re-run the command with non-interactive flags, such as `atlas bash 'pnpm test --no-input'` or by setting appropriate CI environment variables. Similarly, if `prettier` hangs, `atlas bash 'pnpm format'` will diagnose the issue, guiding you to use flags like `--no-input` or `--check` to prevent interactive prompts, ensuring your React codebase remains consistently formatted without manual intervention.

Resolving genuinely slow React build processes with Atlas timeouts

When a React application's build process, often managed by pnpm run build with Vite or Next.js, is genuinely slow in 2026, Atlas provides a clear path forward. The shell_metadata block will indicate a timeout without mentioning interactive input, instructing you to retry the command with an increased timeout value in milliseconds.

Some React build processes, especially for large applications using Vite or Next.js, can genuinely take a long time to complete. If you run `atlas bash 'pnpm run build'` and Atlas's `shell_metadata` reports a timeout without any mention of interactive input, it signifies that the command is simply slow. In such cases, Atlas's output will explicitly instruct you to retry the command with a larger timeout value. For example, you might use `atlas bash --timeout 180000 'pnpm run build'` to allow 3 minutes for the build to complete. Atlas's ability to fan out work to subagents means these long-running processes can execute efficiently, and its TUI, rendered with SolidJS through the OpenTUI renderer, ensures a responsive user experience even during extended operations.

Ensuring safety and review when unblocking React commands with Atlas

Every action Atlas takes to unblock or modify a React command in 2026 is permission-gated and transparent. Before Atlas executes any tool call, it seeks approval based on allow, ask, or deny rules, and for file edits, it computes a unified diff for your review, ensuring full control over changes to your package.json or configuration files.

Atlas prioritizes safety and developer control when assisting with React projects. When diagnosing and resolving hanging commands, Atlas operates with a robust review mechanism. Before any tool call, such as modifying a `package.json` script to add a `--no-input` flag for `Vitest` or `prettier`, Atlas's plan agent drafts a read-only plan and seeks your explicit approval. Every Atlas tool call is permission-gated against allow, ask, and deny rules. Furthermore, if Atlas proposes any file edits, like adjusting a `vite.config.js` or a `package.json` script, it computes a unified diff for every change and surfaces it for your approval before writing. Atlas also reads git branches, status, and diffs, and can snapshot file changes as git patches, allowing edits to be easily diffed and rolled back, providing a secure and transparent workflow for React developers.

Step by step

01Run the potentially hanging React command through Atlas's `bash` tool: Execute `atlas bash 'pnpm test'` for `Vitest with React Testing Library` or `atlas bash 'pnpm run build'` for your Vite or Next.js build, allowing Atlas to monitor its execution.
02Examine the `shell_metadata` block in Atlas's output: After the command times out, read the diagnostic message to determine if Atlas explicitly calls out 'command blocked on interactive input' or if it simply 'timed out'.
03If blocked, re-run the React command with non-interactive flags: For `Vitest`, try `atlas bash 'pnpm test --no-input'` or set a CI environment variable. For `pnpm install`, use `atlas bash 'pnpm install --no-input'`.
04If genuinely slow, retry with an increased timeout value: For a long-running `pnpm run build` command, use `atlas bash --timeout 120000 'pnpm run build'` (for 2 minutes) as instructed by Atlas's output.
05Review Atlas's proposed changes or confirm command completion: If Atlas suggests modifying a `package.json` script to add a flag, review the unified diff before approval. Otherwise, confirm the command now runs to completion.

Frequently asked questions

How does Atlas know if my `pnpm` build is slow or blocked in React?: Atlas's `bash` tool races your `pnpm` command against a timeout. If it expires, Atlas analyzes the process state to explicitly report whether it was genuinely slow or silently blocked on interactive input, a common issue in React development.
Can Atlas help with a hanging `Vitest with React Testing Library` run?: Yes, run your `Vitest` command via `atlas bash 'pnpm test'`. Atlas will diagnose if it's blocked on input, suggesting flags like `--no-input`, or if it's genuinely slow, prompting you to increase the timeout.
What if Atlas suggests modifying my `package.json` for a React script?: Atlas drafts a plan in a read-only agent and computes a unified diff for any file edits, including `package.json`. You must approve this diff before Atlas writes any changes, ensuring full control over your React project.
Does Atlas support `prettier` formatting commands in React projects?: Absolutely. If your `prettier` command, like `atlas bash 'pnpm format'`, hangs, Atlas will diagnose if it's waiting for input or genuinely slow, guiding you to resolve the issue with appropriate flags or timeouts.
How does Atlas ensure my React code stays private when diagnosing?: Atlas can build its code index with local Ollama embeddings, keeping your React code off third-party servers. All tool calls are permission-gated, and file changes are presented as diffs for your approval.
What if I accidentally abort a command in Atlas while debugging a React issue?: If you manually interrupt a command, Atlas's `shell_metadata` block will explicitly state 'User aborted the command,' distinguishing your action from a timeout or a command blocked on input.
Can Atlas handle long-running `pnpm run dev` processes for React development?: Yes, for `pnpm run dev` or similar long-running processes, Atlas can execute them via `atlas bash`. If they exceed a default timeout, Atlas will diagnose the cause and allow you to retry with a larger timeout, or identify if it's blocked.
Is Atlas compatible with my existing React toolchain like Vite or Next.js?: Yes, Atlas is designed to work direct with React apps, from components and hooks to a Vite or Next.js build. It reads your `package.json` and bundler configuration to understand your project context.

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