diff --git a/src/bake/DevServerSourceProvider.cpp b/src/bake/DevServerSourceProvider.cpp
index 3667664384..291e0883ea 100644
--- a/src/bake/DevServerSourceProvider.cpp
+++ b/src/bake/DevServerSourceProvider.cpp
@@ -11,7 +11,7 @@ extern "C" BunString DevServerSourceProvider__getSourceSlice(Bake::DevServerSour
     return Bun::toStringView(provider->source());
 }
 
-extern "C" Bake::SourceMapData DevServerSourceProvider__getSourceMapJSON(Bake::DevServerSourceProvider* provider)
+extern "C" MiCString DevServerSourceProvider__getSourceMapJSON(Bake::DevServerSourceProvider* provider)
 {
     return provider->sourceMapJSON();
 }
diff --git a/src/bake/DevServerSourceProvider.h b/src/bake/DevServerSourceProvider.h
index 111764f143..837c045742 100644
--- a/src/bake/DevServerSourceProvider.h
+++ b/src/bake/DevServerSourceProvider.h
@@ -3,68 +3,12 @@
 #include "headers-handwritten.h"
 #include "JavaScriptCore/SourceOrigin.h"
 #include "ZigGlobalObject.h"
-#include <mimalloc.h>
+#include "MiString.h"
 
 namespace Bake {
 
 class DevServerSourceProvider;
 
-class SourceMapJSONString {
-public:
-    SourceMapJSONString(const char* ptr, size_t length)
-        : m_ptr(ptr)
-        , m_length(length)
-    {
-    }
-
-    ~SourceMapJSONString()
-    {
-        if (m_ptr) {
-            mi_free(const_cast<char*>(m_ptr));
-        }
-    }
-
-    // Delete copy constructor and assignment operator to prevent double free
-    SourceMapJSONString(const SourceMapJSONString&) = delete;
-    SourceMapJSONString& operator=(const SourceMapJSONString&) = delete;
-
-    // Move constructor and assignment
-    SourceMapJSONString(SourceMapJSONString&& other) noexcept
-        : m_ptr(other.m_ptr)
-        , m_length(other.m_length)
-    {
-        other.m_ptr = nullptr;
-        other.m_length = 0;
-    }
-
-    SourceMapJSONString& operator=(SourceMapJSONString&& other) noexcept
-    {
-        if (this != &other) {
-            if (m_ptr) {
-                mi_free(const_cast<char*>(m_ptr));
-            }
-            m_ptr = other.m_ptr;
-            m_length = other.m_length;
-            other.m_ptr = nullptr;
-            other.m_length = 0;
-        }
-        return *this;
-    }
-
-    const char* ptr() const { return m_ptr; }
-    size_t length() const { return m_length; }
-
-private:
-    const char* m_ptr;
-    size_t m_length;
-};
-
-// Struct to return source map data to Zig
-struct SourceMapData {
-    const char* ptr;
-    size_t length;
-};
-
 // Function to be implemented in Zig to register the source provider
 extern "C" void Bun__addDevServerSourceProvider(void* bun_vm, DevServerSourceProvider* opaque_source_provider, BunString* specifier);
 extern "C" void Bun__removeDevServerSourceProvider(void* bun_vm, DevServerSourceProvider* opaque_source_provider, BunString* specifier);
@@ -90,9 +34,9 @@ public:
         return provider;
     }
 
-    SourceMapData sourceMapJSON() const
+    MiCString sourceMapJSON() const
     {
-        return SourceMapData { m_sourceMapJSON.ptr(), m_sourceMapJSON.length() };
+        return m_sourceMapJSON.asCString();
     }
 
 private:
@@ -121,7 +65,7 @@ private:
         }
     }
 
-    SourceMapJSONString m_sourceMapJSON;
+    MiString m_sourceMapJSON;
     Zig::GlobalObject* m_globalObject;
     BunString m_specifier;
 };
diff --git a/src/bun.js/bindings/MiString.h b/src/bun.js/bindings/MiString.h
new file mode 100644
index 0000000000..7502328692
--- /dev/null
+++ b/src/bun.js/bindings/MiString.h
@@ -0,0 +1,56 @@
+#pragma once
+#include "root.h"
+#include <mimalloc.h>
+
+
+struct MiCString {
+    const char* ptr;
+    size_t length;
+};
+
+/// A string which is owned by mimalloc and can be mi_free'd
+class MiString {
+public:
+    MiString(const char* ptr, size_t length)
+        : m_span(ptr, length)
+    {
+    }
+
+    ~MiString()
+    {
+        if (m_span.data()) {
+            mi_free(const_cast<char*>(m_span.data()));
+        }
+    }
+
+    // Delete copy constructor and assignment operator to prevent double free
+    MiString(const MiString&) = delete;
+    MiString& operator=(const MiString&) = delete;
+
+    // Move constructor and assignment
+    MiString(MiString&& other) noexcept
+        : m_span(other.m_span)
+    {
+        other.m_span = {};
+    }
+
+    MiString& operator=(MiString&& other) noexcept
+    {
+        if (this != &other) {
+            if (m_span.data()) {
+                mi_free(const_cast<char*>(m_span.data()));
+            }
+            m_span = other.m_span;
+            other.m_span = {};
+        }
+        return *this;
+    }
+
+    MiCString asCString() const
+    {
+        return MiCString { m_span.data(), m_span.size() };
+    }
+
+private:
+    std::span<const char> m_span;
+};
\ No newline at end of file