Update to es6+.

Remove support for node 8.

Update dependencies.

Update eslint config.

.eslintrc.json

@@ -5,6 +5,18 @@
   },
   "globals": {},
   "extends": "eslint:recommended",
+
+  // Stop ESLint from looking for a configuration file in parent folders
+  "root": true,
+
+  "parser": "babel-eslint",
+  "parserOptions": {
+    "ecmaVersion": 8,
+    "sourceType": "script",
+    "ecmaFeatures": {
+      "experimentalObjectRestSpread": true
+    }
+  },
   "rules": {
     "block-scoped-var": 2,
     "complexity": [
@@ -42,11 +54,6 @@
       "never"
     ],
 
-    "strict": [
-      2,
-      "global"
-    ],
-
     "no-shadow": 2,
     "no-use-before-define": 2,
 
@@ -124,14 +131,14 @@
     ],
     "new-cap": 2,
     "new-parens": 2,
-    "newline-after-var": [
-      1,
-      "always"
+    "padding-line-between-statements": [
+        "error",
+        { "blankLine": "always", "prev": ["const", "let", "var"], "next": "*"},
+        { "blankLine": "any",    "prev": ["const", "let", "var"], "next": ["const", "let", "var"]}
     ],
     "no-array-constructor": 2,
     "no-bitwise": 1,
     "no-lonely-if": 1,
-    "no-multi-spaces": 1,
     "no-multiple-empty-lines": 1,
     "no-new-object": 2,
     "no-spaced-func": 1,
@@ -141,7 +148,6 @@
       1,
       "always"
     ],
-    "one-var": 1,
     "operator-assignment": [
       1,
       "always"

.travis.yml

@@ -2,7 +2,6 @@ language: node_js
 node_js:
   - '12'
   - '10'
-  - '8'
 before_script:
   - npm install -g gulp
   - gulp lint

gulpfile.js

@@ -1,23 +1,19 @@
-'use strict';
-var gulp = require('gulp'),
-    eslint = require('gulp-eslint'),
-    mocha = require('gulp-mocha'),
-    paths = {
-        scripts: ['./*.js', '!./gulpfile.js']
-    };
+const gulp = require('gulp');
+const eslint = require('gulp-eslint');
+const mocha = require('gulp-mocha');
 
-gulp.task('lint', function () {
-    return gulp.src(paths.scripts)
-        .pipe(eslint())
-        .pipe(eslint.format());
-});
+const paths = {
+    scripts: ['./*.js', '!./gulpfile.js']
+};
 
-gulp.task('test', function () {
-    return gulp.src('./test/*.js')
-        .pipe(mocha());
-});
+gulp.task('lint', () => gulp.src(paths.scripts)
+    .pipe(eslint({fix: true}))
+    .pipe(eslint.format()));
+
+gulp.task('test', () => gulp.src('./test/*.js')
+    .pipe(mocha()));
 
-gulp.task('watch', function () {
+gulp.task('watch', () => {
     gulp.watch(paths.scripts, gulp.parallel('lint', 'test'));
 });
 

index.js

@@ -1,13 +1,11 @@
-'use strict';
+const url = require('url');
+const fs = require('fs');
+const getRemoteContent = require('remote-content');
 
-var url = require('url'),
-    fs = require('fs'),
-    getRemoteContent = require('remote-content');
-
-module.exports = function (destHref, sourceHref, callback) {
-    var resolvedUrl,
-        parsedUrl,
-        toUrl = destHref;
+module.exports = (destHref, sourceHref, callback) => {
+    let resolvedUrl;
+    let parsedUrl;
+    let toUrl = destHref;
 
     if (url.parse(sourceHref).protocol === 'file:' && destHref[0] === '/') {
         toUrl = destHref.slice(1);