introduce prettier

Author: EthanLin-TWer

.gitignore

@@ -1,2 +1 @@
-
-node_modules/
+node_modules/

babel.config.js

@@ -1,13 +1,12 @@
 module.exports = {
-    presets: [
-      [
-        '@babel/preset-env',
-        {
-          targets: {
-            node: 'current',
-          },
+  presets: [
+    [
+      '@babel/preset-env',
+      {
+        targets: {
+          node: 'current',
         },
-      ],
+      },
     ],
-  };
-  
+  ],
+}

package.json

@@ -6,12 +6,15 @@
   "author": "Kimmy",
   "license": "MIT",
   "scripts": {
+    "lint": "prettier src/**/*.js *.js",
+    "lint:fix": "npm run lint -- --write",
     "test": "jest"
   },
   "devDependencies": {
     "@babel/core": "^7.7.5",
     "@babel/preset-env": "^7.7.6",
     "babel-jest": "^24.9.0",
-    "jest": "^24.9.0"
+    "jest": "^24.9.0",
+    "prettier": "^1.19.1"
   }
 }

prettier.config.js

@@ -0,0 +1,8 @@
+module.exports = {
+  printWidth: 80,
+  tabWidth: 2,
+  semi: false,
+  singleQuote: true,
+  trailingComma: 'es5',
+  arrowParens: 'always',
+}

src/Calculator.js

@@ -1,6 +1,5 @@
-
 export default class Calculator {
-    add(x, y) {
-        return 0;
-    }
+  add(x, y) {
+    return 0
+  }
 }

src/Calculator.test.js

@@ -1,12 +1,11 @@
+import Calculator from './Calculator'
 
-import Calculator from "./Calculator"
+describe('Calculator', () => {
+  it('should equal to 2 when add 1 and 1', () => {
+    const calculator = new Calculator()
 
-describe("Calculator", () => {
-    it("should equal to 2 when add 1 and 1", () => {
-        const calculator = new Calculator()
+    const result = calculator.add(1, 1)
 
-        const result = calculator.add(1, 1)
-
-        expect(result).toBe(2)
-    })
-});
+    expect(result).toBe(2)
+  })
+})

yarn.lock

@@ -2640,6 +2640,11 @@ prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.npm.taobao.org/prelude-ls/download/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
 
+prettier@^1.19.1:
+  version "1.19.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb"
+  integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==
+
 pretty-format@^24.9.0:
   version "24.9.0"
   resolved "https://registry.npm.taobao.org/pretty-format/download/pretty-format-24.9.0.tgz#12fac31b37019a4eea3c11aa9a959eb7628aa7c9"