add example

Author: zhiyuanliang-ms

examples/console-app/.env.template

@@ -10,3 +10,5 @@ APPCONFIG_ENDPOINT=<app-configuration-endpoint>
 AZURE_TENANT_ID=<AD tenant id or name>
 AZURE_CLIENT_ID=<ID of the user/service principal to authenticate as>
 AZURE_CLIENT_SECRET=<client secret used to authenticate to Azure AD>
+
+AZURE_FRONT_DOOR_ENDPOINT=<Azure Front Door endpoint>

examples/console-app/azureFrontDoor.mjs

@@ -0,0 +1,36 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+import * as dotenv from "dotenv";
+import { promisify } from "util";
+dotenv.config();
+const sleepInMs = promisify(setTimeout);
+
+/**
+ * This example retrives all settings with key following pattern "app.settings.*", i.e. starting with "app.settings.".
+ * With the option `trimKeyPrefixes`, it trims the prefix "app.settings." from keys for simplicity.
+ * Value of config "app.settings.message" will be printed.
+ *
+ * Below environment variables are required for this example:
+ * - APPCONFIG_CONNECTION_STRING
+ */
+
+import { loadFromAzureFrontDoor } from "@azure/app-configuration-provider";
+const endpoint = process.env.AZURE_FRONT_DOOR_ENDPOINT;
+const settings = await loadFromAzureFrontDoor(endpoint, {
+    selectors: [{
+        keyFilter: "CDN.*"
+    }],
+    trimKeyPrefixes: ["CDN."],
+    refreshOptions: {
+        enabled: true,
+        refreshIntervalInMs: 15_000
+    }
+});
+
+while (true) {
+    await settings.refresh();
+    console.log(`Message from Azure Front Door: ${settings.get("Message")}`);
+    // wait for 30 seconds
+    await sleepInMs(30_000);
+}

examples/console-app/helloworld.mjs

@@ -2,7 +2,7 @@
 // Licensed under the MIT license.
 
 import * as dotenv from "dotenv";
-dotenv.config()
+dotenv.config();
 
 /**
  * This example retrives all settings with key following pattern "app.settings.*", i.e. starting with "app.settings.".

examples/console-app/helloworld_aad.mjs

@@ -2,7 +2,7 @@
 // Licensed under the MIT license.
 
 import * as dotenv from "dotenv";
-dotenv.config()
+dotenv.config();
 
 /**
  * This example retrives all settings with key following pattern "app.settings.*", i.e. starting with "app.settings.".