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node_modules/please-upgrade-node/README.md

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+# Please upgrade Node [![](http://img.shields.io/npm/dm/please-upgrade-node.svg?style=flat)](https://www.npmjs.org/package/please-upgrade-node) [![Build Status](https://travis-ci.org/typicode/please-upgrade-node.svg?branch=master)](https://travis-ci.org/typicode/please-upgrade-node) [![npm](https://img.shields.io/npm/v/please-upgrade-node.svg)](https://www.npmjs.com/package/please-upgrade-node)
+
+> :information_desk_person: show a message to your users to upgrade Node instead of a stacktrace 
+
+It's common for new Node users to miss the `npm` engines warning when installing a CLI. This package displays a beginner-friendly message if their Node version is below the one expected.
+
+```sh
+$ node -v
+0.12
+
+$ modern-cli
+modern-cli requires at least version 6 of Node, please upgrade
+```
+
+## Install
+
+```sh
+npm install please-upgrade-node
+```
+
+```js
+#!/usr/bin/env node
+const pkg = require('./package.json')
+require('please-upgrade-node')(pkg)
+// Must run BEFORE requiring other modules
+```
+
+```js
+// package.json
+{
+  "bin": "./bin.js",
+  "engines": {
+    "node": ">=6"
+  }
+}
+```
+
+__Important__: `>=` is the only operator supported by `please-upgrade-node` (e.g. `>=6`, `>=6.0`, `>=6.0.0`).
+
+## Options
+
+You can also pass custom `exitCode` (default: `1`) or `message` function
+
+```js
+pleaseUpgradeNode(pkg, {
+  exitCode: 0,
+  message: function(requiredVersion) {
+    return 'Oops, this program requires Node ' + requiredVersion
+  }
+})
+```
+
+__Important__: to keep `message` function compatible with older versions of Node, avoid using ES6 features like `=>` or string interpolation.
+
+## See also
+
+* [pkg-ok](https://github.com/typicode/pkg-ok) - :ok_hand: Prevents publishing a module with bad paths
+* [husky](https://github.com/typicode/husky) - :dog: Git hooks made easy
+* [update-notifier](https://github.com/yeoman/update-notifier) - Update notifications for your CLI app 
+
+Thanks to [zeit/serve](https://github.com/zeit/serve) for the error message inspiration.
+
+## License
+
+MIT - [Typicode :cactus:](https://github.com/typicode) - [Patreon](https://patreon.com/typicode)