Added: Typescript support

.eslintrc.json

@@ -1,11 +1,11 @@
 {
   "env": {
     "browser": true,
-    "es6": true
+    "es2020": true
   },
   "extends": ["eslint:recommended", "plugin:vue/recommended", "plugin:prettier/recommended"],
   "parserOptions": {
-    "ecmaVersion": 2018,
+    "ecmaVersion": 2020,
     "sourceType": "module"
   },
   "rules": {
@@ -42,5 +42,34 @@
     "require": true,
     "xdescribe": true,
     "xit": true
-  }
+  },
+  "plugins": ["@typescript-eslint"],
+  "overrides": [
+    {
+      "files": ["src/**/*.ts"],
+
+      "extends": [
+        "eslint:recommended",
+        "plugin:vue/recommended",
+        "plugin:@typescript-eslint/eslint-recommended",
+        "plugin:@typescript-eslint/recommended",
+        "plugin:@typescript-eslint/recommended-requiring-type-checking",
+        "prettier/@typescript-eslint",
+        "plugin:prettier/recommended"
+      ],
+
+      "parser": "vue-eslint-parser",
+      "parserOptions": {
+        "parser": "@typescript-eslint/parser",
+        "ecmaVersion": 2020,
+        "sourceType": "module",
+        "project": "tsconfig.json",
+        "tsconfigRootDir": "."
+      },
+      "rules": {
+        "@typescript-eslint/no-namespace": "off"
+      },
+      "plugins": []
+    }
+  ]
 }

package.json

@@ -47,6 +47,8 @@
     "@babel/plugin-proposal-object-rest-spread": "7.9.5",
     "@babel/plugin-transform-modules-commonjs": "7.9.0",
     "@babel/preset-env": "7.9.5",
+    "@typescript-eslint/eslint-plugin": "3.2.0",
+    "@typescript-eslint/parser": "3.2.0",
     "@vue/component-compiler-utils": "3.1.2",
     "eslint": "6.8.0",
     "eslint-config-prettier": "6.11.0",
@@ -57,6 +59,7 @@
     "pug": "2.0.4",
     "regenerator-runtime": "0.13.5",
     "stylus": "0.54.7",
+    "typescript": "3.9.5",
     "vue-hot-reload-api": "2.3.4",
     "vue-server-renderer": "2.6.11",
     "vue-template-compiler": "2.6.11",

tsconfig.json

@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "noImplicitAny": true,
+    "removeComments": true,
+    "preserveConstEnums": true,
+    "sourceMap": true,
+    "types": []
+  },
+  "include": ["src/**/*.ts"],
+  "exclude": ["node_modules", "**/__test__/*"]
+}