style: [skip ci] lint code snippets in md (#5379)

packages/babel-plugin-transform-async-to-module-method/README.md

@@ -34,13 +34,17 @@ npm install --save-dev babel-plugin-transform-async-to-module-method
 
 **.babelrc**
 
-```js
-// without options
+Without options:
+
+```json
 {
   "plugins": ["transform-async-to-module-method"]
 }
+```
 
-// with options
+With options:
+
+```json
 {
   "plugins": [
     ["transform-async-to-module-method", {

packages/babel-plugin-transform-es2015-computed-properties/README.md

@@ -57,13 +57,17 @@ npm install --save-dev babel-plugin-transform-es2015-computed-properties
 
 **.babelrc**
 
-```js
-// without options
+Without options:
+
+```json
 {
   "plugins": ["transform-es2015-computed-properties"]
 }
+```
 
-// with options
+With options:
+
+```json
 {
   "plugins": [
     ["transform-es2015-computed-properties", {

packages/babel-plugin-transform-es2015-for-of/README.md

@@ -49,13 +49,17 @@ npm install --save-dev babel-plugin-transform-es2015-for-of
 
 **.babelrc**
 
+Without options:
+
 ```js
-// without options
 {
   "plugins": ["transform-es2015-for-of"]
 }
+```
 
-// with options
+With options:
+
+```json
 {
   "plugins": [
     ["transform-es2015-for-of", {

packages/babel-plugin-transform-es2015-modules-systemjs/README.md

@@ -35,13 +35,17 @@ npm install --save-dev babel-plugin-transform-es2015-modules-systemjs
 
 **.babelrc**
 
-```javascript
-// without options
+Without options:
+
+```json
 {
   "plugins": ["transform-es2015-modules-systemjs"]
 }
+```
 
-// with options
+With options:
+
+```json
 {
   "plugins": [
     ["transform-es2015-modules-systemjs", {

packages/babel-plugin-transform-es2015-spread/README.md

@@ -48,13 +48,17 @@ npm install --save-dev babel-plugin-transform-es2015-spread
 
 **.babelrc**
 
-```js
-// without options
+Without options:
+
+```json
 {
   "plugins": ["transform-es2015-spread"]
 }
+```
 
-// with options
+With options:
+
+```json
 {
   "plugins": [
     ["transform-es2015-spread", {

packages/babel-plugin-transform-es2015-template-literals/README.md

@@ -28,13 +28,17 @@ npm install --save-dev babel-plugin-transform-es2015-template-literals
 
 **.babelrc**
 
-```js
-// without options
+Without options:
+
+```json
 {
   "plugins": ["transform-es2015-template-literals"]
 }
+```
 
-// with options
+With options:
+
+```json
 {
   "plugins": [
     ["transform-es2015-template-literals", {

packages/babel-plugin-transform-object-rest-spread/README.md

@@ -41,13 +41,15 @@ This plugin will use babel's `extends` helper, which will polyfill `Object.assig
 
 * `useBuiltIns` - Do not use Babel's helper's and just transform to use the built-in method (Disabled by default).
 
-```js
+```json
 {
   "plugins": [
     ["transform-object-rest-spread", { "useBuiltIns": true }]
   ]
 }
+```
 
+```js
 // source
 z = { x, ...y };
 // compiled

packages/babel-plugin-transform-react-jsx/README.md

@@ -64,12 +64,17 @@ npm install --save-dev babel-plugin-transform-react-jsx
 
 **.babelrc**
 
-```js
-// without options
+Without options:
+
+```json
 {
   "plugins": ["transform-react-jsx"]
 }
-// with options
+```
+
+With options:
+
+```json
 {
   "plugins": [
     ["transform-react-jsx", {

packages/babel-plugin-transform-runtime/README.md

@@ -40,13 +40,17 @@ The transformation plugin is typically used only in development, but the runtime
 
 Add the following line to your `.babelrc` file:
 
-```js
-// without options
+Without options:
+
+```json
 {
   "plugins": ["transform-runtime"]
 }
+```
 
-// with options
+With options:
+
+```json
 {
   "plugins": [
     ["transform-runtime", {

packages/babel-plugin-transform-strict-mode/README.md

@@ -34,13 +34,17 @@ npm install --save-dev babel-plugin-transform-strict-mode
 
 **.babelrc**
 
-```js
-// without options
+Without options:
+
+```json
 {
   "plugins": ["transform-strict-mode"]
 }
+```
 
-// with options
+With options:
+
+```json
 {
   "plugins": [
     ["transform-strict-mode", {

packages/babel-preset-latest/README.md

@@ -42,7 +42,7 @@ require("babel-core").transform("code", {
 
 Toggles including plugins from the [es2015 preset](https://babeljs.io/docs/plugins/preset-es2015/).
 
-```js
+```json
 {
   "presets": [
     ["latest", {
@@ -54,7 +54,7 @@ Toggles including plugins from the [es2015 preset](https://babeljs.io/docs/plugi
 
 You can also pass options down to the `es2015` preset.
 
-```js
+```json
 {
   "presets": [
     ["latest", {

packages/babel-register/README.md

@@ -53,7 +53,7 @@ require("babel-register")({
 
   // Ignore can also be specified as a function.
   ignore: function(filename) {
-    if (filename === '/path/to/es6-file.js') {
+    if (filename === "/path/to/es6-file.js") {
       return false;
     } else {
       return true;

packages/babel-template/README.md

@@ -13,24 +13,24 @@ npm install --save-dev babel-template
 ## Usage
 
 ```js
-import template from 'babel-template';
-import generate from 'babel-generator';
-import * as t from 'babel-types';
+import template from "babel-template";
+import generate from "babel-generator";
+import * as t from "babel-types";
 
 const buildRequire = template(`
   var IMPORT_NAME = require(SOURCE);
 `);
 
 const ast = buildRequire({
-  IMPORT_NAME: t.identifier('myModule'),
-  SOURCE: t.stringLiteral('my-module')
+  IMPORT_NAME: t.identifier("myModule"),
+  SOURCE: t.stringLiteral("my-module")
 });
 
 console.log(generate(ast).code);
 ```
 
 ```js
-var myModule = require('my-module');
+const myModule = require("my-module");
 ```
 
 ## API