added to remote repo

frontend/node_modules/agent-base/dist/src/promisify.d.ts

@@ -0,0 +1,4 @@
+import { ClientRequest, RequestOptions, AgentCallbackCallback, AgentCallbackPromise } from './index';
+declare type LegacyCallback = (req: ClientRequest, opts: RequestOptions, fn: AgentCallbackCallback) => void;
+export default function promisify(fn: LegacyCallback): AgentCallbackPromise;
+export {};