fix(mdx): Handle brace counting correctly inside strings for Next-MDX-Remote data props parsing

lib/mdx-utils.ts

@@ -7,14 +7,36 @@ export function fixMdxDataProps(content: string): string {
     let endIndex = -1;
     const startObj = dataIndex + 6; // index of the first '{' in 'data={{'
 
+    let inString = false;
+    let isEscaped = false;
+
     for (let i = startObj; i < fixedContent.length; i++) {
-      if (fixedContent[i] === '{') {
-        openCount++;
-      } else if (fixedContent[i] === '}') {
-        openCount--;
-        if (openCount === 0) {
-          endIndex = i;
-          break;
+      const char = fixedContent[i];
+
+      if (isEscaped) {
+        isEscaped = false;
+        continue;
+      }
+
+      if (char === '\\') {
+        isEscaped = true;
+        continue;
+      }
+
+      if (char === '"') {
+        inString = !inString;
+        continue;
+      }
+
+      if (!inString) {
+        if (char === '{') {
+          openCount++;
+        } else if (char === '}') {
+          openCount--;
+          if (openCount === 0) {
+            endIndex = i;
+            break;
+          }
         }
       }
     }

package.json

@@ -116,7 +116,7 @@
     "prepare": "husky",
     "preinstall": "npx only-allow pnpm"
   },
-  "version": "2.3.30",
+  "version": "2.3.31",
   "pnpm": {
     "onlyBuiltDependencies": [
       "@parcel/watcher",

tests/mdx-regex.test.ts

@@ -8,10 +8,15 @@ describe('MDX Data Props Fixer', () => {
 
     const result = fixMdxDataProps(mdxInput);
 
-    // The expected output should have the entire JSON object enclosed in data="{...}"
-    // and NO trailing characters left over from the regex truncating early.
     const expected = `<Block type="productTabs" data="{&quot;content&quot;:{&quot;root&quot;:{&quot;children&quot;:[]}},&quot;id&quot;:&quot;123&quot;}" />`;
 
     expect(result).toBe(expected);
   });
+
+  it('should not prematurely truncate if } appears inside a string literal', () => {
+    const mdxInput = `<Block type="productTabs" data={{"content":{"text":"}>"}}} />`;
+    const result = fixMdxDataProps(mdxInput);
+    const expected = `<Block type="productTabs" data="{&quot;content&quot;:{&quot;text&quot;:&quot;}&gt;&quot;}}" />`;
+    expect(result).toBe(expected.replace('&gt;', '>'));
+  });
 });