Use blocked scoped variables

In addition to using const and let, this also upgrades our linter config and removes lint (mostly whitespace).

examples/webpack/config.js

@@ -9,8 +9,8 @@ const webpack = require('webpack');
 const src = path.join(__dirname, '..');
 
 const examples = fs.readdirSync(src)
-    .filter(name => /^(?!index).*\.html$/.test(name))
-    .map(name => name.replace(/\.html$/, ''));
+  .filter(name => /^(?!index).*\.html$/.test(name))
+  .map(name => name.replace(/\.html$/, ''));
 
 const entry = {};
 examples.forEach(example => {
@@ -49,7 +49,7 @@ const main = {
 const dev = {
   plugins: [
     new webpack.EnvironmentPlugin(
-        Object.assign({NODE_ENV: 'development'}, process.env)
+      Object.assign({NODE_ENV: 'development'}, process.env)
     )
   ]
 };
@@ -58,7 +58,7 @@ const dev = {
 const prod = {
   plugins: [
     new webpack.EnvironmentPlugin(
-        Object.assign({NODE_ENV: 'production'}, process.env)
+      Object.assign({NODE_ENV: 'production'}, process.env)
     ),
     new MinifyPlugin()
   ]

examples/webpack/example-builder.js

@@ -37,7 +37,7 @@ function createWordIndex(exampleData) {
       if (Array.isArray(text)) {
         text = text.join(' ');
       }
-      let words = text ? text.split(/\W+/) : [];
+      const words = text ? text.split(/\W+/) : [];
       words.forEach(word => {
         if (word) {
           word = word.toLowerCase();
@@ -79,7 +79,7 @@ function ExampleBuilder(config) {
 ExampleBuilder.prototype.apply = function(compiler) {
   compiler.plugin('emit', async (compilation, callback) => {
     const chunks = compilation.getStats().toJson().chunks
-        .filter(chunk => chunk.names[0] !== this.common);
+      .filter(chunk => chunk.names[0] !== this.common);
 
     const exampleData = [];
     const promises = chunks.map(async chunk => {