[BUG] Regression 2.0.54: Unexpected identifier 'B'

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Running claude fails with: "Unexpected identifier 'B'"
(even claude -h, or anything starting claude fails)

What Should Happen?

Claude should start as usual

Error Messages/Logs

> claude
file:///home/ubuntu/.bun/install/global/node_modules/@anthropic-ai/claude-code/cli.js:1305
Please migrate to a newer model. Visit https://docs.anthropic.com/en/docs/resources/model-deprecations for more information.`);qslet B=this._client._options.timeout;if(!A.stream&&B==null){let G=isA[A.model]??void 0;B=this._client.calculateNonstreamingTimeout(A.max_tokens,G)}return this._client.post("/v1/messages",{body:A,timeout:B??600000,...Q,stream:A.stream??!1})}stream(A,Q){return C$A.createMessage(this,A,Q)}countTokens(A,Q){return this._client.post("/v1/messages/count_tokens",{body:A,...Q})}};JPB={"claude-1.3":"November 6th, 2024","claude-1.3-100k":"November 6th, 2024","claude-instant-1.1":"November 6th, 2024","claude-instant-1.1-100k":"November 6th, 2024","claude-instant-1.2":"November 6th, 2024","claude-3-sonnet-20240229":"July 21st, 2025","claude-3-opus-20240229":"January 5th, 2026","claude-2.1":"July 21st, 2025","claude-2.0":"July 21st, 2025","claude-3-7-sonnet-latest":"February 19th, 2026","claude-3-7-sonnet-20250219":"February 19th, 2026"};mw.Batches=H$A});var i7A;var Sm1=M(()=>{O_();GM();Zp();i7A=class i7A extends _Y{retrieve(A,Q={},B){let{betas:G}=Q??{};return this._client.get(aI`/v1/models/${A}`,{...B,headers:l4([{...G?.toString()!=null?{"anthropic-beta":G?.toString()}:void 0},B?.headers])})}list(A={},Q){let{betas:B,...G}=A??{};return this._client.getAPIList("/v1/models",JT,{query:G,...Q,headers:l4([{...B?.toString()!=null?{"anthropic-beta":B?.toString()}:void 0},Q?.headers])})}}});var E$A=M(()=>{Nm1();qm1();jm1();Sm1();sTB()});var z$A=(A)=>{if(typeof globalThis.process<"u")return globalThis.process.env?.[A]?.trim()??void 0;if(typeof globalThis.Deno<"u")return globalThis.Deno.env?.get?.(A)?.trim();return};class e7{constructor({baseURL:A=z$A("ANTHROPIC_BASE_URL"),apiKey:Q=z$A("ANTHROPIC_API_KEY")??null,authToken:B=z$A("ANTHROPIC_AUTH_TOKEN")??null,...G}={}){_m1.add(this),QrA.set(this,void 0);let Z={apiKey:Q,authToken:B,...G,baseURL:A||"https://api.anthropic.com"};if(!Z.dangerouslyAllowBrowser&&cTB())throw new MB(`It looks like you're running in a browser-like environment.
                                                                                                                                     ^

SyntaxError: Unexpected identifier 'B'
    at compileSourceTextModule (node:internal/modules/esm/utils:346:16)
    at ModuleLoader.moduleStrategy (node:internal/modules/esm/translators:107:18)
    at #translate (node:internal/modules/esm/loader:546:20)
    at afterLoad (node:internal/modules/esm/loader:596:29)
    at ModuleLoader.loadAndTranslate (node:internal/modules/esm/loader:601:12)
    at #createModuleJob (node:internal/modules/esm/loader:624:36)
    at #getJobFromResolveResult (node:internal/modules/esm/loader:343:34)
    at ModuleLoader.getModuleJobForImport (node:internal/modules/esm/loader:311:41)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:664:25)

Steps to Reproduce

bun install @anthropic-ai/claude-code@2.0.54

(This happens in 2.0.54+ version, it is working fine when reverting to )

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.0.53

Claude Code Version

2.0.54

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_