Add eslint to the project

.eslintrc.js

@@ -0,0 +1,16 @@
+module.exports = {
+  env: {
+    browser: true,
+    es2020: true,
+    mocha: true
+  },
+  extends: [
+    'standard'
+  ],
+  parserOptions: {
+    ecmaVersion: 12,
+    sourceType: 'module'
+  },
+  rules: {
+  }
+}

package.json

@@ -32,6 +32,12 @@
     "@rollup/plugin-json": "4.1.0",
     "@rollup/plugin-node-resolve": "8.4.0",
     "btoa": "1.2.1",
+    "eslint": "7.7.0",
+    "eslint-config-standard": "14.1.1",
+    "eslint-plugin-import": "2.22.0",
+    "eslint-plugin-node": "11.1.0",
+    "eslint-plugin-promise": "4.2.1",
+    "eslint-plugin-standard": "4.0.1",
     "mkdirp": "1.0.4",
     "mocha": "8.1.1",
     "rollup": "2.23.0",