add npm-run-all --parallel

.babelrc

@@ -0,0 +1,13 @@
+{
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "targets": {
+          "node": "10"
+        }
+      }
+    ],
+    "@babel/preset-typescript"
+  ]
+}

.eslintrc

@@ -1,13 +1,31 @@
 {
-  "parser": "babel-eslint",
   "parserOptions": {
-    "ecmaVersion": "2018"
+    "ecmaVersion": 2019,
+    "sourceType": "module",
+    "ecmaFeatures": {
+      "jsx": true
+    }
   },
   "extends": ["eslint:recommended", "eslint-config-prettier"],
   "rules": {
-    "no-console": "off"
+    "strict": ["error", "never"]
   },
   "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"
+      ]
+    }
+  ]
 }

.flowconfig

@@ -1,11 +0,0 @@
-[ignore]
-
-[include]
-
-[libs]
-
-[lints]
-
-[options]
-
-[strict]

.gitignore

@@ -1 +1,2 @@
 node_modules
+dist

.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"
+  ]
+}

.prettierignore

@@ -1,7 +0,0 @@
-node_modules
-coverage
-dist
-build
-.build
-
-# etc...

.prettierrc

@@ -1,9 +1,14 @@
 {
   "arrowParens": "avoid",
   "bracketSpacing": false,
+  "htmlWhitespaceSensitivity": "css",
+  "insertPragma": false,
   "jsxBracketSameLine": false,
+  "jsxSingleQuote": false,
   "printWidth": 80,
   "proseWrap": "always",
+  "quoteProps": "as-needed",
+  "requirePragma": false,
   "semi": false,
   "singleQuote": true,
   "tabWidth": 2,

package.json

@@ -1,25 +1,30 @@
 {
   "name": "static-testing-tools",
-  "version": "1.0.0",
+  "private": true,
-  "description": "",
+  "author": "Kent C. Dodds (http://kentcdodds.com/)",
-  "main": "index.js",
+  "license": "GPLv3",
   "scripts": {
-    "lint": "eslint src",
+    "build": "babel src --extensions .js,.ts,.tsx --out-dir dist",
-    "flow": "flow",
+    "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",
-    "prettier": "prettier \"**/*.+(js|jsx|json|yml|yaml|css|less|scss|ts|tsx|md|graphql|mdx)\"",
+    "check-format": "npm run prettier -- --list-different",
-    "validate": "npm run lint && npm run prettier -- --list-different && npm run flow",
+    "validate": "npm-run-all --parallel check-types check-format lint build"
-    "precommit": "npm run validate"
   },
-  "keywords": [],
-  "author": "Kent C. Dodds <kent@doddsfamily.us> (http://kentcdodds.com/)",
-  "license": "MIT",
   "devDependencies": {
-    "babel-eslint": "^9.0.0",
+    "@babel/cli": "^7.7.0",
-    "eslint": "^5.5.0",
+    "@babel/core": "^7.7.2",
-    "eslint-config-prettier": "^3.0.1",
+    "@babel/preset-env": "^7.7.1",
-    "flow-bin": "^0.81.0",
+    "@babel/preset-typescript": "^7.7.2",
-    "husky": "^0.14.3",
+    "@typescript-eslint/eslint-plugin": "^2.7.0",
-    "prettier": "^1.14.2"
+    "@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",
+    "npm-run-all": "^4.1.5",
+    "prettier": "^1.19.1",
+    "typescript": "^3.7.2"
   }
 }

src/example.js

@@ -1,5 +1,5 @@
-const name = 'Freddy'
+const username = 'freddy'
-typeof name === 'string'
+typeof username === 'string'
 
 if (!('serviceWorker' in navigator)) {
   // you have an old browser :-(
@@ -7,4 +7,4 @@ if (!('serviceWorker' in navigator)) {
 
 const greeting = 'hello'
 console.log(`${greeting} world!`)
-;[(1, 2, 3)].forEach(x => console.log(x))
+;[1, 2, 3].forEach(x => console.log(x))

src/typescript-example.ts

@@ -1,14 +1,13 @@
-// @flow
 function add(a: number, b: number): number {
   return a + b
 }
 
-type User = {
+interface User {
   name: {
-    first: string,
+    first: string
-    middle: string,
+    middle: string
-    last: string,
+    last: string
-  },
+  }
 }
 function getFullName(user: User): string {
   const {

tsconfig.json

@@ -0,0 +1,6 @@
+{
+  "compilerOptions": {
+    "noEmit": true,
+    "baseUrl": "./src"
+  }
+}