Make remote config version available through API

.changeset/selfish-jokes-applaud.md

@@ -0,0 +1,5 @@
+---
+'@firebase/remote-config': patch
+---
+
+Make remote config version available through API

common/api-review/remote-config.api.md

@@ -29,6 +29,7 @@ export interface FetchResponse {
     config?: FirebaseRemoteConfigObject;
     eTag?: string;
     status: number;
+    version?: string;
 }
 
 // @public

docs-devsite/remote-config.fetchresponse.md

@@ -17,7 +17,7 @@ Defines a successful response (200 or 304).
 <b>Signature:</b>
 
 ```typescript
-export interface FetchResponse 
+export interface FetchResponse
 ```
 
 ## Properties
@@ -27,6 +27,7 @@ export interface FetchResponse
 |  [config](./remote-config.fetchresponse.md#fetchresponseconfig) | [FirebaseRemoteConfigObject](./remote-config.firebaseremoteconfigobject.md#firebaseremoteconfigobject_interface) | Defines the map of parameters returned as "entries" in the fetch response body.<p>Only defined for 200 responses. |
 |  [eTag](./remote-config.fetchresponse.md#fetchresponseetag) | string | Defines the ETag response header value.<p>Only defined for 200 and 304 responses. |
 |  [status](./remote-config.fetchresponse.md#fetchresponsestatus) | number | The HTTP status, which is useful for differentiating success responses with data from those without.<p>The Remote Config client is modeled after the native <code>Fetch</code> interface, so HTTP status is first-class.<p>Disambiguation: the fetch response returns a legacy "state" value that is redundant with the HTTP status code. The former is normalized into the latter. |
+|  [version](./remote-config.fetchresponse.md#version) | string | Remote config version. |
 
 ## FetchResponse.config
 
@@ -65,3 +66,13 @@ The HTTP status, which is useful for differentiating success responses with data
 ```typescript
 status: number;
 ```
+
+## FetchResponse.version
+
+Remote config version.
+
+<b>Signature:</b>
+
+```typescript
+version?: string;
+```

packages/remote-config/src/client/rest_client.ts

@@ -140,6 +140,7 @@ export class RestClient implements RemoteConfigFetchClient {
 
     let config: FirebaseRemoteConfigObject | undefined;
     let state: string | undefined;
+    let version: string | undefined;
 
     // JSON parsing throws SyntaxError if the response body isn't a JSON string.
     // Requesting application/json and checking for a 200 ensures there's JSON data.
@@ -154,6 +155,7 @@ export class RestClient implements RemoteConfigFetchClient {
       }
       config = responseBody['entries'];
       state = responseBody['state'];
+      version = responseBody['templateVersion'];
     }
 
     // Normalizes based on legacy state.
@@ -176,6 +178,6 @@ export class RestClient implements RemoteConfigFetchClient {
       });
     }
 
-    return { status, eTag: responseEtag, config };
+    return { status, eTag: responseEtag, config, version } as FetchResponse;
   }
 }

packages/remote-config/src/public_types.ts

@@ -90,6 +90,11 @@ export interface FetchResponse {
    */
   config?: FirebaseRemoteConfigObject;
 
+  /**
+   * Defines remote config version.
+   */
+  version?: string;
+
   // Note: we're not extracting experiment metadata until
   // ABT and Analytics have Web SDKs.
 }

packages/remote-config/test/client/rest_client.test.ts

@@ -95,7 +95,8 @@ describe('RestClient', () => {
       expect(response).to.deep.eq({
         status: expectedResponse.status,
         eTag: expectedResponse.eTag,
-        config: expectedResponse.entries
+        config: expectedResponse.entries,
+        version: undefined
       });
     });
 
@@ -184,7 +185,8 @@ describe('RestClient', () => {
       expect(response).to.deep.eq({
         status: 304,
         eTag: 'response-etag',
-        config: undefined
+        config: undefined,
+        version: undefined
       });
     });
 
@@ -222,7 +224,8 @@ describe('RestClient', () => {
       expect(response).to.deep.eq({
         status: 304,
         eTag: 'etag',
-        config: undefined
+        config: undefined,
+        version: undefined
       });
     });
 
@@ -239,7 +242,8 @@ describe('RestClient', () => {
         await expect(client.fetch(DEFAULT_REQUEST)).to.eventually.be.deep.eq({
           status: 200,
           eTag: 'etag',
-          config: {}
+          config: {},
+          version: undefined
         });
       }
     });