Add check-types helper

helpers/check-types.js

@@ -0,0 +1,19 @@
+// Universal Imports Only
+
+export function isString( maybeString ) {
+    return (typeof maybeString === 'string' || maybeString instanceof String)
+}
+
+export function isValidHttpUrl( string ) {
+    if ( !isString( string ) ) return false
+
+    let url
+
+    try {
+        url = new URL(string)
+    } catch (_) {
+        return false
+    }
+
+    return url.protocol === "http:" || url.protocol === "https:"
+}