refactor: init cypress-cucumber-preprocessor install.

node_modules/babel-plugin-add-module-exports/README.md

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+babel-plugin-add-module-exports
+---
+
+<p align="right">
+  <a href="https://npmjs.org/package/babel-plugin-add-module-exports">
+    <img src="https://img.shields.io/npm/v/babel-plugin-add-module-exports.svg?style=flat-square">
+  </a>
+  <a href="https://travis-ci.org/59naga/babel-plugin-add-module-exports">
+    <img src="http://img.shields.io/travis/59naga/babel-plugin-add-module-exports.svg?style=flat-square">
+  </a>
+</p>
+
+Why?
+---
+
+Babel@6 doesn't export default `module.exports` any more - [T2212 *Kill CommonJS default export behavior*](https://phabricator.babeljs.io/T2212).
+
+Babel@6 transforms the following file
+
+```js
+export default 'foo'
+```
+
+into
+
+```js
+'use strict';
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = 'foo';
+```
+
+Therefore, it is a need to use the ugly `.default` in node.js.
+
+```js
+require('./bundle.js') // { default: 'foo' }
+require('./bundle.js').default // 'foo'
+```
+
+This plugin follows the babel@5 behavior - add the `module.exports` if **only** the `export default` declaration exists.
+
+```js
+'use strict';
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = 'foo';
+module.exports = exports['default'];
+```
+
+Therefore, our old codes still work fine - the `.default` goes away. :wink:
+
+```js
+require('./bundle.js') // foo
+```
+
+Usage
+---
+
+Install this plugin from npm:
+
+```bash
+npm install babel-plugin-add-module-exports --save-dev
+# or
+yarn add -D babel-plugin-add-module-exports
+```
+
+Write the name to [babelrc](https://babeljs.io/docs/usage/babelrc/). It works with [preset-env](http://babeljs.io/docs/en/babel-preset-env/) to output CommonJS code:
+
+```json
+{
+  "presets": ["@babel/env"],
+  "plugins": ["add-module-exports"]
+}
+```
+
+### modules: false
+
+**However, the plugin doesn't change the pure-esmodule**.
+this plugin makes changes only when exists `exports.default` (in other words, using [commonjs](https://babeljs.io/docs/en/babel-plugin-transform-es2015-modules-commonjs/)).
+
+```json
+{
+  "presets": [["@babel/env", { "modules": false }]],
+  "plugins": ["add-module-exports"]
+}
+```
+
+into
+
+```js
+export default 'foo'
+```
+
+`1.0.0` Currently support is `commonjs` and `umd`.
+Doesn't support `amd`, `systemjs` modules(don't use. there are no plans to support at the moment).
+
+### with Webpack
+
+Likewise, webpack doesn't perform commonjs transformation for [codesplitting](https://webpack.js.org/guides/code-splitting/). Need to set commonjs conversion.
+
+```json
+{
+  "presets": [["@babel/env", { "modules": "commonjs" }]],
+  "plugins": ["add-module-exports"]
+}
+```
+
+Options
+---
+
+## `addDefaultProperty`
+
+If you're exporting an object and wish to maintain compatibility with code using the `require('./bundle.js').default` syntax, you can optionally enable the `addDefaultProperty` option as follows:
+
+```json
+{
+  "presets": ["env"],
+  "plugins": [
+    [
+      "add-module-exports",
+      {
+        "addDefaultProperty": true
+      }
+    ]
+  ]
+}
+```
+
+This will cause a second line of code to be added which aliases the `default` name to the exported object like so:
+
+```js
+module.exports = exports['default'];
+module.exports.default = exports['default']
+```
+
+See also
+---
+* [babel-plugin-experimental-syntax-dynamic-import](https://github.com/59naga/babel-plugin-experimental-syntax-dynamic-import)
+
+License
+---
+[MIT](http://59naga.mit-license.org/)