chore: replace standard with eslint-config-standard and add custom ru…

…les (electron#14636)

* chore: replace standard with eslint-config-standard

This adds support for --cache so linting JS only takes ~1 second and only lints things that changed

It also allows us to add custom linting rules

* chore: add eslint-plugin-mocha and enable the no-exclusive-tests rule

This will block anyone from pushing / merging a `.only` test or describe

.eslintignore

@@ -0,0 +1,4 @@
+vendor
+node_modules
+spec/node_modules
+spec/static

.eslintrc

@@ -0,0 +1,6 @@
+{
+  "extends": "standard",
+  "env": {
+    "browser": true
+  }
+}

.gitignore

@@ -60,3 +60,6 @@ electron.d.ts
 
 # Spec hash calculation
 spec/.hash
+
+# Eslint Cache
+.eslintcache

lib/common/asar_init.js

@@ -1,4 +1,4 @@
-;(function () {
+;(function () { // eslint-disable-line
   return function (process, require, asarSource) {
     const source = process.binding('natives')