refactored to TypeScript

* [x] resolved #2

refactored package to typescript

PR comments

thanks Katryn

simpler type

.eslintignore

@@ -1,2 +1,7 @@
 # compiled output
+<<<<<<< HEAD
 /dist/
+=======
+dist/
+lib/
+>>>>>>> 93a6802... refactored to TypeScript

.eslintrc.js

@@ -1,20 +1,28 @@
 module.exports = {
   root: true,
+  parser: '@typescript-eslint/parser',
   parserOptions: {
-    ecmaVersion: 2015,
+    project: './tsconfig.json',
+    ecmaVersion: 2018,
     sourceType: 'module'
   },
-  plugins: ['prettier'],
-  extends: ['eslint:recommended', 'plugin:prettier/recommended'],
-  env: {
-    browser: true,
-    node: true
+  plugins: ['@typescript-eslint'],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'plugin:@typescript-eslint/recommended',
+    'prettier/@typescript-eslint',
+    'plugin:prettier/recommended'
+  ],
+  rules: {
+    '@typescript-eslint/no-inferrable-types': 1
   },
   overrides: [
     {
+      parser: 'babel-eslint',
       parserOptions: {
         sourceType: 'module',
-        ecmaVersion: 2017
+        ecmaVersion: 2018
       },
       env: {
         browser: false,

.gitignore

@@ -15,3 +15,4 @@ yarn-error.log
 
 # built assets
 /dist
+

README.md

@@ -15,17 +15,21 @@ _random emoji function with zero dependencies_
 
 ```bash
 $ yarn add @0xadada/random-emoji
+$ npm run -s start
+> 🙄
+$ npm run -s start
+> 😜
 $ node
-> const random = require('@0xadada/random-emoji');
+> const { default: random } = require('@0xadada/random-emoji');
 > random()
 '😁'
-let a = random();  // defaults to 'emoticons'
-let b = random('emoticons');
-let c = random('food');
-let d = random('animals');
-let e = random('expressions');
-console.log(a, b, c, d, e);
-// 😍 🙄 🍗 🐥 🤢
+> let a = random();  // defaults to 'emoticons'
+> let b = random('emoticons');
+> let c = random('food');
+> let d = random('animals');
+> let e = random('expressions');
+> console.log(a, b, c, d, e);
+😍 🙄 🍗 🐥 🤢
 ```
 
 

package.json

@@ -12,22 +12,28 @@
   },
   "scripts": {
     "coverage": "npx nyc report --reporter=text-lcov | yarn coveralls",
-    "build": "npx babel src/ --out-dir dist/",
+    "build": "npx tsc",
     "lint": "npx eslint .",
     "lint:fix": "npx eslint . --fix",
-    "test": "npx nyc ava",
-    "prepublish": "npm run lint && npm run test && npm run build"
+    "test": "npm run build && npx nyc ava",
+    "prepublish": "npm run build && npm run test",
+    "start": "npm run build && node -e \"let { default: r } = require('./dist/index'); console.log(r('food'));\""
   },
   "devDependencies": {
     "@babel/cli": "^7.6.4",
     "@babel/core": "^7.6.4",
     "@babel/preset-env": "^7.6.3",
+    "@babel/preset-typescript": "^7.7.2",
+    "@typescript-eslint/eslint-plugin": "^2.8.0",
+    "@typescript-eslint/parser": "^2.8.0",
     "ava": "^2.4.0",
+    "babel-eslint": "^10.0.3",
     "coveralls": "^3.0.6",
-    "eslint": "^6.5.1",
-    "eslint-config-prettier": "^6.3.0",
+    "eslint": "^6.7.0",
+    "eslint-config-prettier": "^6.7.0",
     "eslint-plugin-prettier": "^3.1.1",
     "nyc": "^14.1.1",
-    "prettier": "^1.18.2"
+    "prettier": "^1.19.1",
+    "typescript": "^3.7.2"
   }
 }

src/index.ts

@@ -0,0 +1,16 @@
+type NamedCharRange = 'emoticons' | 'food' | 'animals' | 'expressions';
+
+const CHAR_RANGE = {
+  emoticons: [0x1f600, 0x1f64f],
+  food: [0x1f32d, 0x1f37f],
+  animals: [0x1f400, 0x1f4d3],
+  expressions: [0x1f910, 0x1f92f]
+};
+
+const random = function(range: NamedCharRange = 'emoticons'): string {
+  const [max, min] = CHAR_RANGE[range];
+  const codePoint = Math.floor(Math.random() * (max - min) + min);
+  return String.fromCodePoint(codePoint);
+};
+
+export = random;

test.js

@@ -1,5 +1,5 @@
 import test from 'ava';
-import random from './src/index';
+import random from './dist/index';
 
 test('without arguments it shows an emoticon', t => {
   const a = random();

tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "outDir": "dist",
+    "strict": true
+  },
+  "exclude": ["node_modules", "test.js"]
+}