Add eslint and refactor everything

utils.js

@@ -0,0 +1,17 @@
+function verifyExists(value, err, logger) {
+	if (!value) {
+		logger.error(err);
+		process.exit(0);
+	}
+}
+function verifyDefaults(options, definitions) {
+	for (const optionDefinition of definitions) {
+		if (optionDefinition.defaultOption) {
+			if (!options[optionDefinition.name]) {
+				options[optionDefinition.name] = optionDefinition.defaultOption;
+			}
+		}
+	}
+}
+
+module.exports = { verifyDefaults, verifyExists };