fix: integrate dev tools and fix crusial errors and warnings

.eslintignore

@@ -0,0 +1,13 @@
+# disabled for all by default
+*
+!.*.js
+
+# enabled for spotify only
+!/spotify/
+!/spotify/**/
+!/spotify/**/*
+
+# add more exceptions to enable for other plugins
+# ...
+
+node_modules/

.eslintrc.json

@@ -0,0 +1,30 @@
+{
+  "extends": ["eslint:recommended", "plugin:prettier/recommended"],
+  "parser": "@babel/eslint-parser",
+  "parserOptions": {
+    "requireConfigFile": false
+  },
+  "env": {
+    "es6": true,
+    "node": true
+  },
+  "rules": {
+    "camelcase": [
+      "warn",
+      { "properties": "never", "ignoreDestructuring": true, "ignoreImports": true, "ignoreGlobals": true }
+    ],
+    "eqeqeq": "warn",
+    "new-cap": "warn",
+    "no-async-promise-executor": "off",
+    "no-console": "off",
+    "no-constant-condition": "off",
+    "no-path-concat": "warn",
+    "no-prototype-builtins": "off",
+    "no-redeclare": "warn",
+    "no-use-before-define": "off",
+    "no-sequences": "error",
+    "no-unused-vars": "warn",
+    "no-var": "warn",
+    "strict": "off"
+  }
+}

.gitattributes

@@ -0,0 +1,2 @@
+install.sh text=auto eol=lf
+uninstall.sh text=auto eol=lf

.github/workflows/lint.yml

@@ -0,0 +1,28 @@
+name: Lint
+
+on:
+  pull_request_target:
+    branches:
+      - master
+
+env:
+  NODE_VERSION: 16
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install NodeJS
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint

.gitignore

@@ -1,5 +1,4 @@
+.idea/
+node_modules/
 
 .DS_Store
-*node_modules*
-.gitignore
-/.idea/*

.husky/pre-commit

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+. "$(dirname -- "$0")/_/husky.sh"
+
+npx lint-staged

.lintstagedrc.json

@@ -0,0 +1,4 @@
+{
+  "*.js": "eslint --fix",
+  "*.{json,md}": "prettier --write"
+}

.nvmrc

@@ -0,0 +1 @@
+16

.prettierignore

@@ -0,0 +1,14 @@
+# disabled for all by default
+*
+!.*.*
+
+# enabled for spotify only
+!/spotify/
+!/spotify/**/
+!/spotify/**/*
+
+# add more exceptions to enable for other plugins
+# ...
+
+# those should be the last entries to ignore them again after exceptions
+node_modules/

.prettierrc.json

@@ -0,0 +1,5 @@
+{
+  "endOfLine": "auto",
+  "printWidth": 120,
+  "singleQuote": true
+}