add helper function to get value of baseurl

src/Umbraco.Web.UI.Client/src/core/utils/baseUrl.ts

@@ -0,0 +1,10 @@
+export function baseUrl(): string {
+	if (typeof document !== 'undefined') {
+		const baseElems = document.getElementsByTagName('base');
+		if (baseElems.length) {
+			return baseElems[0].href.slice(0, -1);
+		}
+	}
+
+	return '';
+}

src/Umbraco.Web.UI.Client/src/core/utils/index.ts

@@ -1 +1,2 @@
+export * from './baseUrl';
 export * from './umbraco-path';