Convert to typescript (#9)

BREAKING CHANGE: raise required minimum node to v8

.eslintrc.js

@@ -1,12 +1,22 @@
 module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 2015,
+    project: ['./tsconfig.json', './tsconfig.eslint.json'],
+  },
+  plugins: ['@typescript-eslint'],
   env: {
     browser: false,
     commonjs: true,
     node: true,
   },
-  extends: ['airbnb-base', 'plugin:prettier/recommended'],
-  parserOptions: {
-    ecmaVersion: 2015,
-  },
+  extends: [
+    'airbnb-typescript/base',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'plugin:@typescript-eslint/recommended',
+    'prettier/@typescript-eslint',
+    'plugin:prettier/recommended',
+  ],
   reportUnusedDisableDirectives: true,
 };

.gitignore

@@ -1,3 +1,5 @@
+lib
+
 # Logs
 logs
 *.log
@@ -13,6 +15,8 @@ lib-cov
 
 # Coverage directory used by tools like istanbul
 coverage
+coverage.lcov
+.nyc_output
 
 # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
 .grunt

.mocharc.json

@@ -0,0 +1,5 @@
+{
+  "extension": ["ts"],
+  "recursive": true,
+  "require": ["ts-node/register", "source-map-support/register"]
+}

.nycrc

@@ -1,3 +1,4 @@
 {
-  "temp-dir": "./coverage/.nyc_output"
+  "extends": "@istanbuljs/nyc-config-typescript",
+  "all": true
 }

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "typescript.tsdk": "node_modules/typescript/lib"
+}