refactor ipc Main

src/audio.ts

@@ -6,12 +6,12 @@
 let buffer: ArrayBuffer[] = [];
 
 // place audio data in buffer
-export function collect (chunk: ArrayBuffer) {
-    buffer.push(chunk);
+export const collect: IpcListenerCallback<ArrayBuffer> = (chunk) => {
+    if (chunk) buffer.push(chunk);
 }
 
 // return audio and clear buffer
-export function flush () {
+export const flush = async () => {
     const bufferCopy = buffer;
     buffer = [];
     return bufferCopy;