refactor: avoid duplicate implementation for isJSXText

Author: golopot

lib/rules/jsx-no-useless-fragment.js

@@ -8,6 +8,9 @@ const pragmaUtil = require('../util/pragma');
 const jsxUtil = require('../util/jsx');
 const docsUrl = require('../util/docsUrl');
 
+function isJSXText(node) {
+  return !!node && (node.type === 'JSXText' || node.type === 'Literal');
+}
 
 module.exports = {
   meta: {
@@ -35,7 +38,7 @@ module.exports = {
      * @returns {boolean}
      */
     function isPaddingSpaces(node) {
-      return (node.type === 'JSXText' || node.type === 'Literal') &&
+      return isJSXText(node) &&
         /^\s*$/.test(node.raw) &&
         node.raw.includes('\n');
     }
@@ -66,10 +69,6 @@ module.exports = {
         /^[a-z]+$/.test(node.parent.openingElement.name.name);
     }
 
-    function isJSXText(node) {
-      return !!node && (node.type === 'JSXText' || node.type === 'Literal');
-    }
-
     /**
      * Avoid fixing case like:
      * ```jsx