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‎packages/dtsx/src/generator.ts‎
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+2-2Lines changed: 2 additions & 2 deletions b/Collapse file
‎packages/dtsx/src/generator.ts‎
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+2-2Lines changed: 2 additions & 2 deletions
diff --git a/Collapse file
‎packages/dtsx/src/sourcemap.ts‎
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‎packages/dtsx/src/sourcemap.ts‎
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+9-2Lines changed: 9 additions & 2 deletions
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‎packages/dtsx/src/utils.ts‎
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+9-1Lines changed: 9 additions & 1 deletion b/Collapse file
‎packages/dtsx/src/utils.ts‎
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+9-1Lines changed: 9 additions & 1 deletion
@@ -18,7 +18,7 @@ import { PluginManager } from './plugins'
 import { processDeclarations } from './processor'
 import { normalizeOutput as normalizeDtsOutput } from './output-normalizer'
 import { applyTypeMappings, createTypeMapper } from './type-mappings'
-import { addSourceMapComment, checkIsolatedDeclarationsConfig, createDiff, generateDeclarationMap, validateDtsContent, writeToFile } from './utils'
+import { addSourceMapComment, checkIsolatedDeclarationsConfig, createDiff, generateDeclarationMap, sourceMapCommentPrefix, validateDtsContent, writeToFile } from './utils'
 
 async function writeDeclarationMapFile(
   outputPath: string,
@@ -30,7 +30,7 @@ async function writeDeclarationMapFile(
   const dtsFilename = basename(outputPath) || 'output.d.ts'
   const sourceFilename = relative(dirname(outputPath), sourcePath)
   const mapFilename = `${dtsFilename}.map`
-  const mapCommentIndex = dtsContent.lastIndexOf('\n//# sourceMappingURL=')
+  const mapCommentIndex = dtsContent.lastIndexOf(`\n${sourceMapCommentPrefix()}`)
   const contentToMap = mapCommentIndex === -1 ? dtsContent : dtsContent.slice(0, mapCommentIndex)
   const sourceMap = generateDeclarationMap(contentToMap, dtsFilename, sourceFilename, sourceCode)
   const mapPath = `${outputPath}.map`
 
@@ -6,6 +6,13 @@
 import { readFile, writeFile } from 'node:fs/promises'
 import { basename, dirname, relative, resolve } from 'node:path'
 
+// Keep the source-map directive marker out of dtsx's own bundled JavaScript.
+// Bun scans dependency text for that marker even when it appears inside a
+// string literal, then tries to decode the placeholder as this bundle's map.
+function sourceMapComment(url: string): string {
+  return `${String.fromCharCode(47, 47, 35)} sourceMappingURL=${url}`
+}
+
 /**
  * Source map configuration
  */
@@ -254,7 +261,7 @@ export class SourceMapGenerator {
    * Generate inline source map comment
    */
   toComment(includeContent = false): string {
-    return `//# sourceMappingURL=${this.toDataUrl(includeContent)}`
+    return sourceMapComment(this.toDataUrl(includeContent))
   }
 }
 
@@ -549,7 +556,7 @@ export function appendSourceMapComment(
   content: string,
   mapFileName: string,
 ): string {
-  return `${content}\n//# sourceMappingURL=${mapFileName}`
+  return `${content}\n${sourceMapComment(mapFileName)}`
 }
 
 /**
 
@@ -8,6 +8,14 @@ import { write } from './compat'
 import { config } from './config'
 import { validateTypeScriptSyntax } from './syntax-validator'
 
+/**
+ * Build the source-map directive without embedding the complete marker in
+ * dtsx's own bundle, where Bun can mistake a string literal for a real map.
+ */
+export function sourceMapCommentPrefix(): string {
+  return `${String.fromCharCode(47, 47, 35)} sourceMappingURL=`
+}
+
 /**
  * Exhaustive check helper for switch statements
  * This function should never be called if all cases are handled
@@ -367,5 +375,5 @@ export function generateDeclarationMap(
  * Add source map URL comment to declaration content
  */
 export function addSourceMapComment(dtsContent: string, mapFilename: string): string {
-  return `${dtsContent}\n//# sourceMappingURL=${mapFilename}\n`
+  return `${dtsContent}\n${sourceMapCommentPrefix()}${mapFilename}\n`
 }