Don't replace null in RFC content

Author: bertdeblock

lib/frontmatter-updater.js

@@ -12,8 +12,12 @@ module.exports = class FrontmatterUpdater {
       throw new Error(`Could not parse frontmatter: ${JSON.stringify(errors)}`);
     }
 
-    let output = frontmatter.stringify(content, merge(data, metadata, { arrayMerge: unionMerge }));
-    return output.replaceAll(' null', '');
+    let frontmatterContent = frontmatter
+      .stringify('', merge(data, metadata, { arrayMerge: unionMerge }))
+      .replaceAll(': null', ':')
+      .trim();
+
+    return [frontmatterContent, content].join('\n');
   }
 };
 

test/frontmatter-updater-test.js

@@ -17,7 +17,7 @@ prs:
 
 ## My heading
 
-Foo bar baz
+Foo bar baz null
 `;
 
 const readyForReleaseMarkdown = `---
@@ -36,7 +36,7 @@ prs:
 
 ## My heading
 
-Foo bar baz
+Foo bar baz null
 `;
 
 const updatedDeepKeysMarkdown = `---
@@ -58,7 +58,7 @@ prs:
 
 ## My heading
 
-Foo bar baz
+Foo bar baz null
 `;
 
 describe('FrontmatterUpdater', function () {