Revert "temp revert #81"

This reverts commit 835161c737.

typings/index.d.ts

@@ -1,5 +1,5 @@
-import record from './record';
+import record, { addCustomEvent } from './record';
 import { Replayer } from './replay';
 import { mirror } from './utils';
 export { EventType, IncrementalSource, MouseInteractions, ReplayerEvents, } from './types';
-export { record, Replayer, mirror };
+export { record, addCustomEvent, Replayer, mirror };

typings/record/index.d.ts

@@ -1,3 +1,4 @@
 import { recordOptions, listenerHandler } from '../types';
+export declare function addCustomEvent<T>(tag: string, payload: T): void;
 declare function record(options?: recordOptions): listenerHandler | undefined;
 export default record;