fix: check upper bounds of message line numbers for code blocks

lib/processor.js

@@ -331,7 +331,7 @@ function adjustBlock(block) {
 
  const lineInCode = message.line - leadingCommentLines;
 
- if (lineInCode < 1) {
+ if (lineInCode < 1 || lineInCode >= block.rangeMap.length) {
  return null;
  }
 

tests/lib/processor.js

@@ -755,6 +755,17 @@
  });
  });
 
+ it("should ignore messages after the code block", () => {
+ const empty = [
+ '```javascript',
+ '```',
+ ].join('\n');
+ processor.preprocess(empty, 'empty.md');
+ const message = { message: 'Empty file', ruleId: null, line: 2 };
+ const result = processor.postprocess([[message]], 'empty.md');
+
+ assert.deepStrictEqual(result, []);
+ });
  });
 
  describe("supportsAutofix", () => {