[BUG] Websocket constructor not found if `DEV=true` is in the environment

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.22 (Claude Code)
• Operating System: Manjaro Linux 25.0.3
• Terminal: WezTerm

Bug Description

When the environment variable DEV is set to a non-falsy value, claude results in the following error on startup:

$ claude
╭──────────────────────────╮
│ ✻ Welcome to Claude Code │
╰──────────────────────────╯

file:///home/redacted/file/path/node_modules/@anthropic-ai/claude-code/cli.js:227

# ... minified stacktrace

TypeError: window.WebSocket is not a constructor
    at Module.Q01 (file:///home/redacted/file/path/node_modules/@anthropic-ai/claude-code/cli.js:227:20201)
    at file:///home/redacted/file/path/node_modules/@anthropic-ai/claude-code/cli.js:227:22891
    at file:///home/redacted/file/path/node_modules/@anthropic-ai/claude-code/cli.js:7:570
    at file:///home/redacted/file/path/node_modules/@anthropic-ai/claude-code/cli.js:674:8873

Node.js v24.2.0

Calling claude with DEV=false results in it starting up correctly.

Steps to Reproduce

1. export DEV=true
2. claude
3. Error!
4. export DEV=false
5. claude
6. Success!

Expected Behavior

It should work regardless of my local environment variables

Actual Behavior

It does not work with regards to my local environment variables