Style fixes for Node 6

Reduce divergence from eslint-config-airbnb-base due to unsupported ES6
features in Node 4.  Update code to comply with new rules.

Signed-off-by: Kevin Locke <[email protected]>

Author: kevinoid

.eslintrc.yaml

@@ -92,21 +92,13 @@ rules:
   ## Requires operator at the beginning of the line in multiline statements
   # Airbnb prevents breaks around =, suggesting ().  I don't see the advantage.
   operator-linebreak: [2, "before"]
-  ## allow use of spread operator, which is not supported in Node v4
-  prefer-spread: 0
   ## no space before function, eg. 'function()'
   space-before-function-paren: [2, "never"]
 
   # ECMAScript 6 Rules
   # list: https://github.com/eslint/eslint/tree/master/docs/rules#ecmascript-6
   ## require parentheses around arrow function arguments (as Node core does)
   arrow-parens: [2, "always"]
-  ## Prefer destructuring from arrays and objects
-  # Disabled since unsupported on Node < 6
-  prefer-destructuring: 0
-  ## Suggest using the rest parameters instead of arguments
-  # Disabled since unsupported on Node < 6
-  prefer-rest-params: 0
 
   # eslint-plugin-import
   ## Allow requiring devDependencies in test, test-bin, and test-lib

bin/cmd.js

@@ -22,9 +22,9 @@ function parseYargs(yargs, args, callback) {
   // are not caught and passed to a second invocation of callback.
   let called = false;
   try {
-    yargs.parse(args, function() {
+    yargs.parse(args, function(...cbargs) {
       called = true;
-      return callback.apply(this, arguments);
+      return callback.apply(this, cbargs);
     });
   } catch (err) {
     if (called) {

test/helper-unhandled-rejection.js

@@ -27,8 +27,8 @@ if (typeof process !== 'undefined') {
     });
   } else {
     const oldOHR = window.onunhandledrejection;
-    window.onunhandledrejection = function(evt) {
-      if (typeof oldOHR === 'function') { oldOHR.apply(this, arguments); }
+    window.onunhandledrejection = function(evt, ...args) {
+      if (typeof oldOHR === 'function') { oldOHR.apply(this, args); }
       throw evt.detail.reason;
     };
   }