fix

lib/preprocessors/glimmer.js

@@ -110,13 +110,26 @@ function mapRange(messages, filename) {
   const original = TEXT_CACHE.get(filename);
   const flattened = messages.flat();
 
+  if (!transformed) {
+    return flattened;
+  }
+
+  // if there are no instances of the placeholder value, then this template
+  // did not contain a <template> tag, so preprocessed === postprocessed
+  if (!transformed.includes(util.TEMPLATE_TAG_PLACEHOLDER)) {
+    return flattened;
+  }
+
+  const lines = transformed.split('\n');
+  const originalLines = original.split('\n');
+
   // get template ranges to remove eslint messages that are inside the templates
   const templateRanges = [];
   let isInsideTemplate = false;
-  for (const [index, line] of transformed.split('\n').entries()) {
+  for (const [index, line] of lines.entries()) {
     const lineHasOpeningTag = openingTemplateTagRegex.test(line);
     const lineHasClosingTag = closingTemplateTagRegex.test(line);
-
+  
     if (lineHasOpeningTag) {
       isInsideTemplate = true;
       templateRanges.push({
@@ -125,7 +138,7 @@ function mapRange(messages, filename) {
         startColumn: line.search(openingTemplateTagRegex) + 1,
       });
     }
-
+  
     if (lineHasClosingTag && isInsideTemplate) {
       isInsideTemplate = false;
       const match = line.match(closingTemplateTagRegex);
@@ -134,19 +147,6 @@ function mapRange(messages, filename) {
     }
   }
 
-  if (!transformed) {
-    return flattened;
-  }
-
-  // if there are no instances of the placeholder value, then this template
-  // did not contain a <template> tag, so preprocessed === postprocessed
-  if (!transformed.includes(util.TEMPLATE_TAG_PLACEHOLDER)) {
-    return flattened;
-  }
-
-  const lines = transformed.split('\n');
-  const originalLines = original.split('\n');
-
   // this function assumes the original output and transformed output
   // are identical, minus the changes to transform `<template>` into the
   // placeholder `[__GLIMMER_TEMPLATE()]