Introduce buffered console logger

ts/util/consoleLogger.ts

@@ -24,4 +24,48 @@ export const consoleLogger: LoggerType = {
     console.log(...args);
   },
 };
+
+export type BufferedLoggerType = LoggerType & {
+  writeBufferInto(logger: LoggerType): void;
+};
+
+export function createBufferedConsoleLogger(): BufferedLoggerType {
+  type BufferEntryType = Readonly<{
+    level: keyof LoggerType;
+    args: Array<unknown>;
+  }>;
+  const buffer = new Array<BufferEntryType>();
+  return {
+    fatal(...args: Array<unknown>) {
+      buffer.push({ level: 'fatal', args });
+      console.error(...args);
+    },
+    error(...args: Array<unknown>) {
+      buffer.push({ level: 'error', args });
+      console.error(...args);
+    },
+    warn(...args: Array<unknown>) {
+      buffer.push({ level: 'warn', args });
+      console.warn(...args);
+    },
+    info(...args: Array<unknown>) {
+      buffer.push({ level: 'info', args });
+      console.info(...args);
+    },
+    debug(...args: Array<unknown>) {
+      buffer.push({ level: 'debug', args });
+      console.debug(...args);
+    },
+    trace(...args: Array<unknown>) {
+      buffer.push({ level: 'trace', args });
+      console.log(...args);
+    },
+
+    writeBufferInto(output) {
+      for (const { level, args } of buffer) {
+        output[level](...args);
+      }
+    },
+  };
+}
 /* eslint-enable no-console */