add eslint

Author: mohsinulhaq

README.md

@@ -3,6 +3,7 @@
 [![npm downloads](https://img.shields.io/npm/dm/react-popper-tooltip.svg)](https://www.npmjs.com/package/react-popper-tooltip)
 [![Dependency Status](https://david-dm.org/mohsinulhaq/react-popper-tooltip.svg)](https://david-dm.org/mohsinulhaq/react-popper-tooltip)
 [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
+![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)
 
 React tooltip component based on [react-popper](https://github.com/FezVrasta/react-popper), the 
 React wrapper around [popper.js](https://popper.js.org/) library.

docs/examples/EscapeToClose.js

@@ -1,6 +1,12 @@
 import React from 'react';
+import T from 'prop-types';
 
 export default class EscapeToClose extends React.Component {
+  static propTypes = {
+    closeTooltip: T.func.required,
+    children: T.object
+  };
+
   componentDidMount() {
     document.addEventListener('keydown', this._handleKeyDown);
   }

docs/examples/utils.js

@@ -1,11 +1,16 @@
 import React from 'react';
+import T from 'prop-types';
 
 export class StateContainer extends React.Component {
+  static propTypes = {
+    children: T.func.required
+  };
+
   state = {
     on: false
   };
 
-  set = on => this.setState({on});
+  set = on => this.setState({ on });
 
   toggle = () => this.setState(prevState => ({ on: !prevState.on }));
 

package.json

@@ -19,11 +19,13 @@
     "build": "yarn build:cjs; yarn build:esm; mkdir -p dist && cp src/styles.css dist",
     "build:cjs": "babel --delete-dir-on-start src -d lib/cjs",
     "build:esm": "babel --delete-dir-on-start --env-name esm src -d lib/esm",
-    "prepare": "yarn build && yarn docs:deploy",
+    "prepublishOnly": "yarn lint && yarn build && yarn docs:deploy",
     "docs": "docz dev",
     "docs:build": "docz build",
-    "docs:deploy": "yarn docs:build && cp .docz/dist/index.html .docz/dist/404.html && gh-pages -d .docz/dist"
+    "docs:deploy": "yarn docs:build && cp .docz/dist/index.html .docz/dist/404.html && gh-pages -d .docz/dist",
+    "lint": "eslint ."
   },
+  "pre-commit": "lint",
   "keywords": [
     "react",
     "tooltip",
@@ -40,6 +42,58 @@
   "prettier": {
     "singleQuote": true
   },
+  "eslintConfig": {
+    "env": {
+      "browser": true,
+      "es6": true,
+      "node": true
+    },
+    "parser": "babel-eslint",
+    "extends": [
+      "eslint:recommended",
+      "plugin:react/recommended",
+      "plugin:jsx-a11y/recommended",
+      "plugin:prettier/recommended"
+    ],
+    "parserOptions": {
+      "ecmaFeatures": {
+        "jsx": true
+      },
+      "ecmaVersion": 2018,
+      "sourceType": "module"
+    },
+    "plugins": [
+      "react",
+      "jsx-a11y"
+    ],
+    "settings": {
+      "react": {
+        "version": "latest"
+      }
+    },
+    "rules": {
+      "indent": [
+        "error",
+        2
+      ],
+      "linebreak-style": [
+        "error",
+        "unix"
+      ],
+      "quotes": [
+        "error",
+        "single"
+      ],
+      "semi": [
+        "error",
+        "always"
+      ]
+    }
+  },
+  "eslintIgnore": [
+    "dist",
+    "lib"
+  ],
   "peerDependencies": {
     "react": "^16.3.0",
     "react-dom": "^16.3.0"
@@ -55,9 +109,16 @@
     "@babel/plugin-transform-runtime": "^7.1.0",
     "@babel/preset-env": "^7.1.0",
     "@babel/preset-react": "^7.0.0",
+    "babel-eslint": "^9.0.0",
     "docz": "^0.11.2",
     "docz-plugin-css": "^0.11.0",
+    "eslint": "^5.6.0",
+    "eslint-config-prettier": "^3.1.0",
+    "eslint-plugin-jsx-a11y": "^6.1.1",
+    "eslint-plugin-prettier": "^2.6.2",
+    "eslint-plugin-react": "^7.11.1",
     "gh-pages": "^2.0.0",
+    "pre-commit": "^1.2.2",
     "prop-types": "^15.6.2",
     "react": "^16.5.2",
     "react-dom": "^16.5.2"

src/Tooltip.js

@@ -1,3 +1,4 @@
+/* eslint-disable react/no-find-dom-node */
 import React, { PureComponent } from 'react';
 import { findDOMNode } from 'react-dom';
 import T from 'prop-types';