Feature: Add event tracking & fix eslint problems (#24)

Author: frankzhaopeng

.eslintignore

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+node_modules
+build

.eslintrc.json

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+{
+	"env":{
+    "browser":true,
+    "es2021":true
+	},
+	"extends":[
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier"
+	],
+	"parser":"@typescript-eslint/parser",
+	"parserOptions":{
+    "ecmaVersion":"latest",
+    "sourceType":"module"
+	},
+	"plugins":[
+    "@typescript-eslint",
+    "check-file",
+    "import"
+	],
+	"rules":{
+    "import/extensions": [
+      "off",
+      "ignorePackages",
+      {
+        "ts": "always",
+        "tsx": "always"
+      }
+    ],
+    "linebreak-style":[
+      "error",
+      "unix"
+    ],
+    "quotes":[
+      "error",
+      "single"
+    ],
+    "semi":[
+      "error",
+      "always"
+    ],
+    "@typescript-eslint/ban-ts-comment": [
+      "warn",
+      {"ts-ignore": "allow-with-description"}
+    ]
+  }
+}

.prettierrc

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+{
+  "singleQuote": true,
+  "printWidth": 120
+}