Add check script

Add node version file

Make scripts executable

.nvmrc

@@ -0,0 +1 @@
+16.13.0

bin/check-nvmrc.js

@@ -0,0 +1,41 @@
+#! /usr/bin/env node
+
+'use strict'
+
+var fs = require('fs')
+var path = require('path')
+
+fs.readFile(path.join(__dirname, '../.nvmrc'), 'utf8', function (error, data) {
+  if (error) throw error
+  var expectedVersion = data.trim()
+  var currentVersion = process.version.replace('v', '')
+
+  var versionMatchesExactly = expectedVersion === currentVersion
+  var versionMatchesMajor = expectedVersion.split('.')[0] === currentVersion.split('.')[0]
+
+  if (versionMatchesExactly) {
+    process.exit()
+  }
+
+  var nvmInstallText = 'To do this you can install nvm (https://github.com/creationix/nvm) then run `nvm install`.'
+
+  if (versionMatchesMajor) {
+    console.log('' +
+      'Warning: You are using Node.js version ' + currentVersion + ' which we do not use. ' +
+      '\n\n' +
+      'You may encounter issues, consider installing Node.js version ' + expectedVersion + '.' +
+      '\n\n' +
+      nvmInstallText +
+    '')
+    process.exit()
+  }
+
+  console.log('' +
+    'You are using Node.js version ' + currentVersion + ' which we do not support. ' +
+    '\n\n' +
+    'Please install Node.js version ' + expectedVersion + ' and try again.' +
+    '\n\n' +
+    nvmInstallText +
+  '')
+  process.exit(1) // exit with a failure mode
+})

package.json

@@ -10,7 +10,9 @@
   "scripts": {
     "build": "rm -rf ./dist/ && tsc",
     "prepare": "npm run build",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "build-release": "node bin/check-nvmrc.js && ./bin/build-release.sh",
+    "publish-release": "node bin/check-nvmrc.js && ./bin/publish-release.sh"
   },
   "keywords": [],
   "author": "",