init

.eslintrc

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+{
+  "parser": "babel-eslint",
+  "rules": {
+    "valid-typeof": "error",
+    "no-negated-in-lhs": "error",
+    "no-unused-vars": "error",
+    "no-template-curly-in-string": "error",
+    "no-undef": "error",
+    "no-unexpected-multiline": "error"
+  },
+  "env": {
+    "browser": true
+  }
+}

.flowconfig

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+[ignore]
+
+[include]
+
+[libs]
+
+[lints]
+
+[options]
+
+[strict]

.gitignore

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+node_modules

.prettierrc

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+{
+  "arrowParens": "avoid",
+  "bracketSpacing": false,
+  "jsxBracketSameLine": false,
+  "printWidth": 80,
+  "proseWrap": "always",
+  "semi": false,
+  "singleQuote": true,
+  "tabWidth": 2,
+  "trailingComma": "all",
+  "useTabs": false
+}

package.json

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+{
+  "name": "static-testing-tools",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "Kent C. Dodds <kent@doddsfamily.us> (http://kentcdodds.com/)",
+  "license": "MIT",
+  "devDependencies": {
+    "babel-eslint": "^9.0.0",
+    "eslint": "^5.5.0",
+    "eslint-config-prettier": "^3.0.1",
+    "flow-bin": "^0.80.0",
+    "husky": "^0.14.3",
+    "lint-staged": "^7.2.2",
+    "prettier": "^1.14.2"
+  }
+}

src/eslint.js

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+const name = 'Freddy'
+typeof name === 'strng'
+
+if (!'serviceWorker' in navigator) {
+  // you have an old browser :-(
+}
+
+const greeting = 'hello'
+console
+  .log('${greting} world!')
+
+  [(1, 2, 3)].forEach(x => console.log(x))

src/flow.js

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+// @flow
+
+function add(a: number, b: number): number {
+  return a + b
+}
+
+type User = {
+  name: {
+    first: string,
+    middle: string,
+    last: string,
+  },
+}
+
+function getFullName(user: User): string {
+  const {
+    name: {first, middle, last},
+  } = user
+  return [first, middle, last].filter(Boolean).join('')
+}
+
+add(1, 2)
+const one = '1'
+add(one, 2)
+
+getFullName({name: {first: 'Joe', middle: 'Bud', last: 'Matthews'}})
+getFullName({name: {first: 'Joe', middle: false, last: 'Matthews'}})

src/prettier.js

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+const user = {
+  name: {first: 'Joe', middle: 'Bud', last: 'Matthews'},
+  age: 25,
+  birthday: 'October 18th, 1988',
+}
+
+console.log(user)