feat(flipt-web): update types to match flipt-client-js (#1303)

Signed-off-by: Philipp Jardas <[email protected]>

Author: phjardas

libs/providers/flipt-web/src/index.ts

@@ -1 +1,2 @@
 export * from './lib/flipt-web-provider';
+export * from './lib/models';

libs/providers/flipt-web/src/lib/models.ts

@@ -1,7 +1,13 @@
 export interface FliptWebProviderOptions {
   url?: string;
   authentication?: FliptWebProviderAuthentication;
-  fetcher?: () => Promise<Response>;
+  fetcher?: FliptFetcher;
+}
+
+export type FliptFetcher = (args?: FliptFetcherOptions) => Promise<Response>;
+
+export interface FliptFetcherOptions {
+  etag?: string;
 }
 
 export interface FliptClientTokenAuthentication {