Refactor CLI and add tests

src/server/utils.js

@@ -0,0 +1,22 @@
+module.exports = {
+  toNative: toNative
+}
+
+// Turns string to native.
+// Example:
+//   'true' -> true
+//   '1' -> 1
+function toNative (value) {
+  if (typeof value === 'string') {
+    if (value === ''
+       || value.trim() !== value
+       || (value.length > 1 && value[0] === '0')) {
+      return value
+    } else if (value === 'true' || value === 'false') {
+      return value === 'true'
+    } else if (!isNaN(+value)) {
+      return +value
+    }
+  }
+  return value
+}