Fix message massaging for ESLint warnings

Author: Timer

packages/react-dev-utils/formatWebpackMessages.js

@@ -32,6 +32,15 @@ function formatMessage(message, isError) {
     return message.indexOf('Thread Loader (Worker') === -1;
   });
 
+  // Strip `ModuleWarning` head off message before parsing (because of ESLint)
+  // https://github.com/webpack/webpack/blob/c77030573de96b8293c69dd396492f8e2d46561e/lib/ModuleWarning.js
+  var moduleWarningPrefix = 'Module Warning: ';
+  if (lines[1].indexOf(moduleWarningPrefix) === 0) {
+    lines[1] = lines[1].slice(moduleWarningPrefix.length);
+  } else if (lines[1].match(/Module Warning \(from.*?\):/)) {
+    lines.splice(1, 1);
+  }
+
   // Strip `ModuleError` header off message before parsing
   // https://github.com/webpack/webpack/blob/c77030573de96b8293c69dd396492f8e2d46561e/lib/ModuleError.js
   var moduleErrorPrefix = 'Module Error: ';