Quit cleanly when stream window closed

src/node/StreamWindow.js

@@ -47,6 +47,7 @@ export default class StreamWindow extends EventEmitter {
     })
     win.removeMenu()
     win.loadURL('about:blank')
+    win.on('close', () => this.emit('close'))
 
     // Work around https://github.com/electron/electron/issues/14308
     // via https://github.com/lutzroeder/netron/commit/910ce67395130690ad76382c094999a4f5b51e92

src/node/index.js

@@ -356,6 +356,10 @@ async function main() {
     updateState({ views: viewStates })
   })
 
+  streamWindow.on('close', () => {
+    process.exit(0)
+  })
+
   const dataSources = [
     ...argv.data['json-url'].map((url) =>
       markDataSource(pollDataURL(url, argv.data.interval), 'json-url'),