fix lint issues found by newer eslint

Author: leebyron

.eslintrc

@@ -240,10 +240,7 @@
         "int32Hint": false
       }
     ],
-    "space-return-throw-case": [
-      2,
-      "always"
-    ],
+    "space-return-throw-case": 2,
     "space-unary-ops": [
       2,
       {
@@ -257,6 +254,6 @@
     ],
     "wrap-regex": 0,
     "no-var": 0,
-    "max-len": 80
+    "max-len": [2, 80, 4]
   }
 }

src/validator/rules/NoUndefinedVariables.js

@@ -8,7 +8,6 @@
  *  of patent rights can be found in the PATENTS file in the same directory.
  */
 
-import type { ValidationContext } from '../index';
 import { GraphQLError } from '../../error';
 import { FRAGMENT_DEFINITION } from '../../language/kinds';
 import {
@@ -23,7 +22,7 @@ import {
  * A GraphQL operation is only valid if all variables encountered, both directly
  * and via fragment spreads, are defined by that operation.
  */
-export default function NoUndefinedVariables(context: ValidationContext): any {
+export default function NoUndefinedVariables(): any {
   var operation;
   var visitedFragmentNames = {};
   var definedVariableNames = {};

src/validator/rules/NoUnusedFragments.js

@@ -8,8 +8,6 @@
  *  of patent rights can be found in the PATENTS file in the same directory.
  */
 
-import type { ValidationContext } from '../index';
-
 import { GraphQLError } from '../../error';
 import { unusedFragMessage } from '../errors';
 
@@ -19,7 +17,7 @@ import { unusedFragMessage } from '../errors';
  * A GraphQL document is only valid if all fragment definitions are spread
  * within operations, or spread within other fragments spread within operations.
  */
-export default function NoUnusedFragments(context: ValidationContext): any {
+export default function NoUnusedFragments(): any {
   var fragmentDefs = [];
   var spreadsWithinOperation = [];
   var fragAdjacencies = {};

src/validator/rules/NoUnusedVariables.js

@@ -8,7 +8,6 @@
  *  of patent rights can be found in the PATENTS file in the same directory.
  */
 
-import type { ValidationContext } from '../index';
 import { GraphQLError } from '../../error';
 import { unusedVariableMessage } from '../errors';
 
@@ -19,7 +18,7 @@ import { unusedVariableMessage } from '../errors';
  * A GraphQL operation is only valid if all variables defined by an operation
  * are used, either directly or within a spread fragment.
  */
-export default function NoUnusedVariables(context: ValidationContext): any {
+export default function NoUnusedVariables(): any {
   var visitedFragmentNames = {};
   var variableDefs = [];
   var variableNameUsed = {};