[BUG] "ERROR G.ref is not a function" when attempting to pipe a slash command

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?

I was curious if I could pipe slash commands because the CLI reference demonstrates piping prompts, and doesn't explicitly say you can't pipe slash commands.

As a test I tried /cost.

The following attempts both fail the same way:

# with echo
$ echo "/cost" | claude

# with cat
$ echo "/cost" > slash.txt
$ cat slash.txt | claude

What Should Happen?

One of the following would be less surprising:

• Support piping commands this way
• Present an error if piping commands is not going to be supported
• Ignore the commands and just start claude normally

Error Messages/Logs

╭───────────────────────────────────────────────────╮
│ ✻ Welcome to Claude Code!                         │
│                                                   │
│   /help for help, /status for your current setup  │
│                                                   │
│   cwd: /Users/chris/ws/github/project            │
╰───────────────────────────────────────────────────╯

  ERROR  G.ref is not a function. (In 'G.ref()', 'G.ref' is undefined)

 /$bunfs/root/claude:666:164

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665 | `)W.name="enter";else if(Z==="\t")W.name="tab";else if(Z==="\b"||Z==="\x1B\b")W.name="backspace",W.meta=Z.charAt(0)==="\x1B";else if(Z==="\x7F"||Z==="\x1B\x7F")W.name="backspace",W.meta=Z.charAt(0)==="\x1B";else if(Z==="\x1B"||Z==="\x1B\x1B")W.name="escape",W.meta=Z.length===2;else if(Z===" "||Z==="\x1B ")W.name="space",W.meta=Z.length===2;else if(Z==="\x1F")W.name="_",W.ctrl=!0;else if(Z<="\x1A"&&Z.length===1)W.name=String.fromCharCode(Z.charCodeAt(0)+97-1),W.ctrl=!0;else if(Z.length===1&&Z>="0"&&Z<="9")W.name="number";else if(Z.length===1&&Z>="a"&&Z<="z")W.name=Z;else if(Z.length===1&&Z>="A"&&Z<="Z")W.name=Z.toLowerCase(),W.shift=!0;else if(G=UM5.exec(Z))W.meta=!0,W.shift=/^[A-Z]$/.test(G[1]);else if(G=AM5.exec(Z)){let Y=[...Z];if(Y[0]==="\x1B"&&Y[1]==="\x1B")W.option=!0;let X=[G[1],G[2],G[4],G[6]].filter(Boolean).join(""),B=(G[3]||G[5]||1)-1;W.ctrl=!!(B&4),W.meta=!!(B&10),W.shift=!!(B&1),W.code=X,W.name=CYZ[X],W.shift=EM5(X)||W.shift,W.ctrl=RM5(X)||W.ctrl}if(W.raw==="\x1Bb")W.meta=!0,W.name="left";else if( | ... truncated 
666 | Read about how to prevent this error on https://github.com/vadimdemedes/ink/#israwmodesupported`);if(G.setEncoding("utf8"),Z){if(this.rawModeEnabledCount===0)G.ref(),G.setRawMode(!0),G.addListener("readable",this.handleReadable),this.props.stdout.write("\x1B[?2004h");this.rawModeEnabledCount++;return}if(--this.rawModeEnabledCount===0)this.props.stdout.write("\x1B[?2004l"),G.setRawMode(!1),G.removeListener("readable",this.handleReadable),G.unref()};flushIncomplete=()=>{if(this.incompleteEscapeTimer=null,!this.keyParseState.incomplete)return;this.processInput(null)};processInput=(Z)=>{let[G,W]=NYZ(this.keyParseState,Z);this.keyParseState=W;for(let Y of G)this.handleInput(Y.sequence),this.internal_eventEmitter.emit("input",Y);if(this.keyParseState.incomplete){if(this.incompleteEscapeTimer)clearTimeout(this.incompleteEscapeTimer);this.incompleteEscapeTimer=setTimeout(this.flushIncomplete,this.keyParseState.mode==="IN_PASTE"?this.PASTE_TIMEOUT:this.NORMAL_TIMEOUT)}};handleReadable=()=>{let Z;while((Z=this.props.st | ... truncated 

TypeError: G.ref is not a function. (In 'G.ref()', 'G.ref' is undefined)
      at handleSetRawMode (/$bunfs/root/claude:666:164)
      at <anonymous> (/$bunfs/root/claude:673:257)
      at s6 (/$bunfs/root/claude:49:21530)
      at kz (/$bunfs/root/claude:49:41111)
      at QF (/$bunfs/root/claude:49:35147)
      at MY (/$bunfs/root/claude:47:4842)
      at CX (/$bunfs/root/claude:49:32454)
      at <anonymous> (/$bunfs/root/claude:53:1839)
      at render (/$bunfs/root/claude:671:511)
      at kM5 (/$bunfs/root/claude:672:954)

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662 | `).slice(1):void 0,W=G?wYZ.parseLine(G[0]):void 0,Y=DYZ(W?.file),X,B=0;if(Y&&W?.line&&x30.existsSync(Y)){let J=x30.readFileSync(Y,"utf8");if(X=FYZ(J,W.line),X)for(let{line:Q}of X)B=Math.max(B,String(Q).length)}return KQ.default.createElement(y,{flexDirection:"column",padding:1},KQ.default.createElement(y,null,KQ.default.createElement(O,{backgroundColor:"error",color:"text"}," ","ERROR"," "),KQ.default.createElement(O,null," ",Z.message)),W&&Y&&KQ.default.createElement(y,{marginTop:1},KQ.default.createElement(O,{dimColor:!0},Y,":",W.line,":",W.column)),W&&X&&KQ.default.createElement(y,{marginTop:1,flexDirection:"column"},X.map(({line:J,value:Q})=>KQ.default.createElement(y,{key:J},KQ.default.createElement(y,{width:B+1},KQ.default.createElement(O,{dimColor:J!==W.line,backgroundColor:J===W.line?"error":void 0,color:J===W.line?"text":void 0},String(J).padStart(B," "),":")),KQ.default.createElement(O,{key:J,backgroundColor:J===W.line?"error":void 0,color:J===W.line?"text":void 0}," "+Q)))),Z.stack&&KQ.default.crea | ... truncated 
663 | `).slice(1).map((J)=>{let Q=wYZ.parseLine(J);if(!Q)return KQ.default.createElement(y,{key:J},KQ.default.createElement(O,{dimColor:!0},"- "),KQ.default.createElement(O,{dimColor:!0,bold:!0},J));return KQ.default.createElement(y,{key:J},KQ.default.createElement(O,{dimColor:!0},"- "),KQ.default.createElement(O,{dimColor:!0,bold:!0},Q.function),KQ.default.createElement(O,{dimColor:!0,color:"secondaryText"}," ","(",DYZ(Q.file)??"",":",Q.line,":",Q.column,")"))})))}import{Buffer as $M5}from"buffer";var UM5=/^(?:\x1b)([a-zA-Z0-9])$/,AM5=/^(?:\x1b+)(O|N|\[|\[\[)(?:(\d+)(?:;(\d+))?([~^$])|(?:1;)?(\d+)?([a-zA-Z]))/,NM5="\x1B[200~",v30="\x1B[201~";function CM5(Z){return{name:"",fn:!1,ctrl:!1,meta:!1,shift:!1,option:!1,sequence:Z,raw:Z,isPasted:!0}}var LM5=new RegExp("^(.*?)("+["\\x1b\\][0-9]*(?:;[^\\x07\\x1b]*)*(?:\\x07|\\x1b\\\\)","\\x1bP[^\\x1b]*\\x1b\\\\","\\x1b\\[[0-9]*(?:;[0-9]*)*[A-Za-z~]","\\x1bO[A-Za-z]","\\x1b[\\x00-\\x7F]","\\x1b\\x1b","$"].map((Z)=>`(?:${Z})`).join("|")+")","s"),MM5=new RegExp("(.*?)("+["\\x1 | ... truncated 
664 | `)W.name="enter";else if(Z==="\t")W.name="tab";else if(Z==="\b"||Z==="\x1B\b")W.name="backspace",W.meta=Z.charAt(0)==="\x1B";else if(Z==="\x7F"||Z==="\x1B\x7F")W.name="backspace",W.meta=Z.charAt(0)==="\x1B";else if(Z==="\x1B"||Z==="\x1B\x1B")W.name="escape",W.meta=Z.length===2;else if(Z===" "||Z==="\x1B ")W.name="space",W.meta=Z.length===2;else if(Z==="\x1F")W.name="_",W.ctrl=!0;else if(Z<="\x1A"&&Z.length===1)W.name=String.fromCharCode(Z.charCodeAt(0)+97-1),W.ctrl=!0;else if(Z.length===1&&Z>="0"&&Z<="9")W.name="number";else if(Z.length===1&&Z>="a"&&Z<="z")W.name=Z;else if(Z.length===1&&Z>="A"&&Z<="Z")W.name=Z.toLowerCase(),W.shift=!0;else if(G=UM5.exec(Z))W.meta=!0,W.shift=/^[A-Z]$/.test(G[1]);else if(G=AM5.exec(Z)){let Y=[...Z];if(Y[0]==="\x1B"&&Y[1]==="\x1B")W.option=!0;let X=[G[1],G[2],G[4],G[6]].filter(Boolean).join(""),B=(G[3]||G[5]||1)-1;W.ctrl=!!(B&4),W.meta=!!(B&10),W.shift=!!(B&1),W.code=X,W.name=CYZ[X],W.shift=EM5(X)||W.shift,W.ctrl=RM5(X)||W.ctrl}if(W.raw==="\x1Bb")W.meta=!0,W.name="left";else if( | ... truncated 
665 | Read about how to prevent this error on https://github.com/vadimdemedes/ink/#israwmodesupported`);else throw new Error(`Raw mode is not supported on the stdin provided to Ink.
666 | Read about how to prevent this error on https://github.com/vadimdemedes/ink/#israwmodesupported`);if(G.setEncoding("utf8"),Z){if(this.rawModeEnabledCount===0)G.ref(),G.setRawMode(!0),G.addListener("readable",this.handleReadable),this.props.stdout.write("\x1B[?2004h");this.rawModeEnabledCount++;return}if(--this.rawModeEnabledCount===0)this.props.stdout.write("\x1B[?2004l"),G.setRawMode(!1),G.removeListener("readable",this.handleReadable),G.unref()};flushIncomplete=()=>{if(this.incompleteEscapeTimer=null,!this.keyParseState.incomplete)return;this.processInput(null)};processInput=(Z)=>{let[G,W]=NYZ(this.keyParseState,Z);this.keyParseState=W;for(let Y of G)this.handleInput(Y.sequence),this.internal_eventEmitter.emit("input",Y);if(this.keyParseState.incomplete){if(this.incompleteEscapeTimer)clearTimeout(this.incompleteEscapeTimer);this.incompleteEscapeTimer=setTimeout(this.flushIncomplete,this.keyParseState.mode==="IN_PASTE"?this.PASTE_TIMEOUT:this.NORMAL_TIMEOUT)}};handleReadable=()=>{let Z;while((Z=this.props.st | ... truncated 

TypeError: G.ref is not a function. (In 'G.ref()', 'G.ref' is undefined)
      at handleSetRawMode (/$bunfs/root/claude:666:164)


Bun v1.2.19 (macOS arm64)

Steps to Reproduce

# with echo
$ echo "/cost" | claude

# with cat
$ echo "/cost" > slash.txt
$ cat slash.txt | claude

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.0.109

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

• I'm using native install method
• claude doctor shows a clean bill of health