add lint-staged

.eslintrc

@@ -12,5 +12,20 @@
   },
   "env": {
     "browser": true
-  }
+  },
+  "overrides": [
+    {
+      "files": "**/*.+(ts|tsx)",
+      "parser": "@typescript-eslint/parser",
+      "parserOptions": {
+        "project": "./tsconfig.json"
+      },
+      "plugins": ["@typescript-eslint/eslint-plugin"],
+      "extends": [
+        "plugin:@typescript-eslint/eslint-recommended",
+        "plugin:@typescript-eslint/recommended",
+        "eslint-config-prettier/@typescript-eslint"
+      ]
+    }
+  ]
 }

.huskyrc

@@ -0,0 +1,5 @@
+{
+  "hooks": {
+    "pre-commit": "npm run check-types && lint-staged"
+  }
+}

.lintstagedrc

@@ -0,0 +1,9 @@
+{
+  "*.+(js|ts|tsx)": [
+    "eslint"
+  ],
+  "*.+(js|json|ts|tsx)": [
+    "prettier --write",
+    "git add"
+  ]
+}

package.json

@@ -5,7 +5,7 @@
   "license": "GPLv3",
   "scripts": {
     "build": "babel src --extensions .js,.ts,.tsx --out-dir dist",
-    "lint": "eslint --ignore-path .gitignore .",
+    "lint": "eslint --ignore-path .gitignore --ext .js,.ts,.tsx .",
     "check-types": "tsc",
     "prettier": "prettier --ignore-path .gitignore \"**/*.+(js|json|ts|tsx)\"",
     "format": "npm run prettier -- --write",
@@ -17,8 +17,12 @@
     "@babel/core": "^7.7.2",
     "@babel/preset-env": "^7.7.1",
     "@babel/preset-typescript": "^7.7.2",
+    "@typescript-eslint/eslint-plugin": "^2.7.0",
+    "@typescript-eslint/parser": "^2.7.0",
     "eslint": "^6.6.0",
     "eslint-config-prettier": "^6.5.0",
+    "husky": "^3.0.9",
+    "lint-staged": "^9.4.2",
     "prettier": "^1.19.1",
     "typescript": "^3.7.2"
   }