style: add eslint to the project

The config is based on airbnb shared config, with some rules that work better with the project.

Author: wagoid

.dockerignore

@@ -7,3 +7,4 @@ coverage
 fixtures
 src/action.test.js
 src/testUtils.js
+.eslintrc.json

.eslintrc.json

@@ -0,0 +1,10 @@
+{
+  "extends": ["airbnb-base", "prettier", "plugin:node/recommended"],
+  "plugins": ["prettier"],
+  "rules": {
+    "prettier/prettier": "error",
+    "no-console": "off",
+    "no-process-exit": "off",
+    "node/no-unpublished-require": "off"
+  }
+}

.lintstagedrc.js

@@ -1,4 +1,5 @@
 module.exports = {
   '*.{ts,tsx,vue,css,less,scss,html,htm,md,markdown}': 'prettier --write',
-  '*.{js,jsx,json,yml,yaml}': ['prettier --write', () => 'npm run test'],
+  '*.{json,yml,yaml}': ['prettier --write', () => 'npm run test'],
+  '*.{js,jsx}': ['eslint --fix', () => 'npm run test']],
 }

commitlint.config.js

@@ -1,8 +1,9 @@
+/* eslint-disable import/no-extraneous-dependencies */
 const { maxLineLength } = require('@commitlint/ensure')
 
 const bodyMaxLineLength = 100
 
-const validateBodyMaxLengthIgnoringDeps = parsedCommit => {
+const validateBodyMaxLengthIgnoringDeps = (parsedCommit) => {
   const { type, scope, body } = parsedCommit
   const isDepsCommit =
     type === 'chore' && (scope === 'deps' || scope === 'deps-dev')