diff --git a/helpers/check-types.js b/helpers/check-types.js
index 6c9dc51..db4162f 100644
--- a/helpers/check-types.js
+++ b/helpers/check-types.js
@@ -4,6 +4,19 @@ export function isString( maybeString ) {
     return (typeof maybeString === 'string' || maybeString instanceof String)
 }
 
+export function isNonEmptyString ( maybeString ) {
+    if ( !isString( maybeString ) ) return false
+
+    return maybeString.length > 0
+}
+
+export function isPositiveNumberString ( maybeNumber ) {
+    if ( !isString( maybeNumber ) ) return false
+
+    return /\d+$/.test( maybeNumber )
+}
+
+
 export function isValidHttpUrl( maybeUrl, allowUnsecure = false ) {
     if ( !isString( maybeUrl ) ) return false
 
@@ -22,6 +35,17 @@ export function isValidHttpUrl( maybeUrl, allowUnsecure = false ) {
     return url.protocol === "https:"
 }
 
+export function isValidImageUrl ( maybeUrl ) {
+    if ( !isValidHttpUrl( maybeUrl ) ) return false
+
+    // Check if url has a file extension
+    const url = new URL(maybeUrl)
+    const fileExtension = url.pathname.split('.').pop()
+
+    return isNonEmptyString( fileExtension )
+}
+
+
 export function isObject( maybeObject ) {
     return maybeObject === Object( maybeObject )
 }