Log stderr also before launch

Author: jjonescz

js/demo.ts

@@ -54,17 +54,20 @@ interface NodePrediction {
     // Wait for Python inference to start.
     log.verbose('waiting for Python');
     await new Promise<void>((resolve, reject) => {
+      let loaded = false;
       const messageListener = (data: string) => {
         console.log(`PYTHON: ${data}`);
         log.silly('python stdout', { data });
         if (data === 'Inference started.') {
+          loaded = true;
           python.off('message', messageListener);
           resolve();
         }
       };
       python.on('message', messageListener);
       python.on('stderr', (data) => {
-        if (log.isLevelEnabled('debug')) console.error(`PYTERR: ${data}`);
+        if (!loaded || log.isLevelEnabled('debug'))
+          console.error(`PYTERR: ${data}`);
         log.silly('python stderr', { data });
       });
       python.on('close', () => {