introduce typescript and wakkanay #1

.eslintrc.json

@@ -0,0 +1,20 @@
+{
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:@typescript-eslint/eslint-recommended",
+    "plugin:prettier/recommended",
+    "prettier/@typescript-eslint"
+  ],
+  "plugins": ["@typescript-eslint", "prettier"],
+  "parser": "@typescript-eslint/parser",
+  "env": { "node": true, "es6": true },
+  "parserOptions": {
+    "sourceType": "module"
+  },
+  "rules": {
+    "@typescript-eslint/explicit-function-return-type": 0,
+    "@typescript-eslint/no-use-before-define": 0,
+    "@typescript-eslint/interface-name-prefix": 0
+  }
+}

.gitignore

@@ -0,0 +1,2 @@
+node_modules
+dist

.prettierrc

@@ -0,0 +1,5 @@
+{
+  "semi": false,
+  "trailingComma": "none",
+  "singleQuote": true
+}

.travis.yml

@@ -0,0 +1,12 @@
+language: node_js
+node_js:
+  - 10
+
+before_install:
+  # Upgrade npm to >=6.12 because of prepare don't work with `npm ci` command.
+  # https://npm.community/t/npm-ci-does-not-run-prepare-script-for-git-modules-version-6-11/10076/3
+  - npm install -g npm@latest
+
+script:
+  - npm run test
+  - npm run lint

__tests__/sample.test.ts

@@ -0,0 +1,5 @@
+describe('Sample', () => {
+  test('true', () => {
+    expect(1 + 2).toBe(3)
+  })
+})