[mcp] Fix bailout loc (facebook#32931)

poteto · web-flow · commit 3c75bf21dd2f · 2025-04-16T17:49:15.000-04:00
Use the correct loc line numbers and not [Object:object] --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/32931). * facebook#32932 * __->__ facebook#32931 * facebook#32930 * facebook#32929 * facebook#32928
diff --git a/compiler/packages/react-mcp-server/src/index.ts b/compiler/packages/react-mcp-server/src/index.ts
@@ -283,7 +283,7 @@ server.tool(
           if (typeof err.loc !== 'symbol') {
             return {
               type: 'text' as const,
-              text: `React Compiler bailed out: ${err.message}@${err.loc.start}:${err.loc.end}`,
+              text: `React Compiler bailed out:\n\n${err.message}@${err.loc.start.line}:${err.loc.end.line}`,
             };
           }
           return null;

Original file line number	Diff line number	Diff line change
`@@ -283,7 +283,7 @@ server.tool(`
`283`	`283`	`if (typeof err.loc !== 'symbol') {`
`284`	`284`	`return {`
`285`	`285`	`type: 'text' as const,`
`286`		- text: `React Compiler bailed out: ${err.message}@${err.loc.start}:${err.loc.end}`,
	`286`	+ text: `React Compiler bailed out:\n\n${err.message}@${err.loc.start.line}:${err.loc.end.line}`,
`287`	`287`	`};`
`288`	`288`	`}`
`289`	`289`	`return null;`