Migrated Hosted Explorer to React (#360)

Co-authored-by: Victor Meng <vimeng@microsoft.com>
Co-authored-by: Steve Faulkner <stfaul@microsoft.com>

src/Platform/Hosted/extractFeatures.ts

@@ -0,0 +1,14 @@
+export function extractFeatures(params?: URLSearchParams): { [key: string]: string } {
+  params = params || new URLSearchParams(window.parent.location.search);
+  const featureParamRegex = /feature.(.*)/i;
+  const features: { [key: string]: string } = {};
+  params.forEach((value: string, param: string) => {
+    if (featureParamRegex.test(param)) {
+      const matches: string[] = param.match(featureParamRegex);
+      if (matches.length > 0) {
+        features[matches[1].toLowerCase()] = value;
+      }
+    }
+  });
+  return features;
+}