fix: messageId to message to support eslint 2

Author: stephenjason89

src/rules/extensions.js

@@ -237,7 +237,8 @@ module.exports = {
         if (candidate && isUseOfExtensionRequired(candidate.replace(/^\./, ''), isPackage)) {
           context.report({
             node,
-            messageId: 'missingExtension',
+            message:
+              `Missing file extension for "${importPathWithQueryString}"`,
             data: {
               importPath: importPathWithQueryString,
               expected: candidate,
@@ -253,7 +254,7 @@ module.exports = {
         if (isUseOfExtensionForbidden(extension) && isResolvableWithoutExtension(importPath, extension)) {
           context.report({
             node: source,
-            messageId: 'unexpectedExtension',
+            message: `Unexpected use of file extension "${extension}" for "${importPathWithQueryString}"`,
             data: {
               extension,
               importPath: importPathWithQueryString,