chore: adding an eslint

.eslintignore

@@ -0,0 +1 @@
+node_modulse

.eslintrc.js

@@ -0,0 +1,29 @@
+module.exports = {
+  env: {
+    browser: true,
+    node: true,
+    es6: true,
+  },
+  extends: ['eslint:recommended'],
+  plugins: ['prettier'],
+  rules: {
+    'prettier/prettier': [
+      'warn',
+      {
+        semi: true,
+        singleQuote: true,
+        tabWidth: 2,
+        endOfLine: 'auto',
+        printWidth: 80,
+      },
+    ],
+    'comma-dangle': ['error', 'only-multiline'],
+    'linebreak-style': ['error', 'windows'],
+    'no-param-reassign': [
+      2,
+      {
+        props: false,
+      },
+    ],
+  }
+};

.gitignore

@@ -1 +1,2 @@
 .vscode
+node_modules

package.json

@@ -0,0 +1,16 @@
+{
+  "name": "leaflet-examples",
+  "version": "1.0.0",
+  "repository": "https://github.com/tomik23/leaflet-examples.git",
+  "author": "Grzegorz Tomicki",
+  "license": "MIT",
+  "keywords": [
+    "leaflet-examples",
+    "leaflet-maps"
+  ],
+  "devDependencies": {
+    "eslint": "^7.11.0",
+    "eslint-config-prettier": "^6.14.0",
+    "prettier": "^2.1.2"
+  }
+}

template/script.js

@@ -1,3 +1,4 @@
+/* eslint-disable no-undef */
 /**
  * XXXXXXXXXXXX
  */
@@ -10,14 +11,15 @@ let config = {
 // magnification with which the map will start
 const zoom = 18;
 // co-ordinates
-const lat = 52.2297700;
-const lon = 21.0117800;
+const lat = 52.22977;
+const lon = 21.01178;
 
 // calling map
 const map = L.map('map', config).setView([lat, lon], zoom);
 
 // Used to load and display tile layers on the map
 // Most tile servers require attribution, which you can set under `Layer`
 L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
-  attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
-}).addTo(map);
+  attribution:
+    '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
+}).addTo(map);