chore: add ESLint

.eslintrc.yml

@@ -0,0 +1,13 @@
+extends:
+  - airbnb-base
+  - prettier
+env:
+  node: true
+  # Not a real browser, but jsdom is available.
+  # This is good enough.
+  browser: true
+plugins:
+  - prettier
+rules:
+  global-require: 0
+  "prettier/prettier": "error"

debug.js

@@ -6,6 +6,7 @@ const { DOMElement, DOMCollection } = prettyFormat.plugins;
 
 function prettyDOM(htmlElement, maxLength, options) {
   if (htmlElement.documentElement) {
+    // eslint-disable-next-line no-param-reassign
     htmlElement = htmlElement.documentElement;
   }
 
@@ -20,4 +21,5 @@ function prettyDOM(htmlElement, maxLength, options) {
     : debugContent;
 }
 
+// eslint-disable-next-line no-console
 module.exports = (el = document) => console.log(prettyDOM(el));

generateImage.js

@@ -3,6 +3,7 @@ const merge = require("lodash.merge");
 const debug = require("./debug");
 
 const addArg = (opts, arg) => {
+  // eslint-disable-next-line no-param-reassign
   if (!Array.isArray(opts.launch.args)) opts.launch.args = [];
 
   if (!opts.launch.args.includes(arg)) {

package.json

@@ -3,6 +3,9 @@
   "version": "3.0.2",
   "description": "Generate screenshots of jsdom",
   "main": "index.js",
+  "scripts": {
+    "lint": "eslint ."
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/dferber90/jsdom-screenshot.git"
@@ -21,6 +24,7 @@
   },
   "dependencies": {
     "connect": "3.6.6",
+    "eslint-plugin-prettier": "2.6.2",
     "finalhandler": "1.1.1",
     "lodash.merge": "^4.6.1",
     "pretty-format": "23.6.0",
@@ -29,5 +33,12 @@
   },
   "engines": {
     "node": ">=8"
+  },
+  "devDependencies": {
+    "eslint": "5.6.0",
+    "eslint-config-airbnb-base": "13.1.0",
+    "eslint-config-prettier": "3.1.0",
+    "eslint-plugin-import": "2.14.0",
+    "prettier": "1.14.3"
   }
 }