Split classes out to separate files for easier authoring, merge using…

… shell script, lint JS

README.md

@@ -32,6 +32,5 @@ Design Pattern: [Listbox](https://www.w3.org/TR/wai-aria-practices/#Listbox)
 ## Cross-platform testing
 
 ```shell
-cd ~
-ngrok http http://127.0.0.1:8080/
+cd ~ && ./ngrok http http://127.0.0.1:8080/
 ```

build-scripts/merge-js.sh

@@ -0,0 +1,21 @@
+
+#!/bin/bash
+
+# File: ./build-scripts/merge-js.sh
+# Allows classes to be authored in separate files but merged into frontend.js
+# for linting and transpiling to frontend-es5.js via wpdtrt-npm-scripts.
+# This script can be run via npm run merge:js
+#
+# Note:
+# chmod a+x = Change access permissions of this file, to 'e[x]ecutable' for '[a]ll users'
+#
+# Example:
+# ---
+# chmod a+x build-scripts/*.sh
+# ---
+
+# e: exit the script if any statement returns a non-true return value
+# v: print shell input lines as they are read (including all comments!)
+set -e
+
+cat ./js/classes/_config.js ./js/classes/*.js ./js/init.js > ./js/frontend.js

js/classes/_config.js

@@ -0,0 +1,2 @@
+/* eslint-disable max-classes-per-file */
+/* eslint-disable no-redeclare */