Fix jsx-curly-spacing crash with ESLint 3 (fixes #1779)

Author: yannickcr

lib/rules/jsx-curly-spacing.js

@@ -228,7 +228,16 @@ module.exports = {
         message: `There should be no space after '${token.value}'`,
         fix: function(fixer) {
           const nextToken = sourceCode.getTokenAfter(token);
-          const nextComment = sourceCode.getCommentsAfter(token);
+          let nextComment;
+
+          // ESLint >=4.x
+          if (sourceCode.getCommentsAfter) {
+            nextComment = sourceCode.getCommentsAfter(token);
+          // ESLint 3.x
+          } else {
+            const potentialComment = sourceCode.getTokenAfter(token, {includeComments: true});
+            nextComment = nextToken === potentialComment ? [] : [potentialComment];
+          }
 
           // Take comments into consideration to narrow the fix range to what is actually affected. (See #1414)
           if (nextComment.length > 0) {
@@ -253,7 +262,16 @@ module.exports = {
         message: `There should be no space before '${token.value}'`,
         fix: function(fixer) {
           const previousToken = sourceCode.getTokenBefore(token);
-          const previousComment = sourceCode.getCommentsBefore(token);
+          let previousComment;
+
+          // ESLint >=4.x
+          if (sourceCode.getCommentsBefore) {
+            previousComment = sourceCode.getCommentsBefore(token);
+          // ESLint 3.x
+          } else {
+            const potentialComment = sourceCode.getTokenBefore(token, {includeComments: true});
+            previousComment = previousToken === potentialComment ? [] : [potentialComment];
+          }
 
           // Take comments into consideration to narrow the fix range to what is actually affected. (See #1414)
           if (previousComment.length > 0) {