Correct type of pino's stream parameter (#1874)

Author: quisido

pino.d.ts

@@ -799,7 +799,7 @@ declare function pino<CustomLevels extends string = never>(optionsOrStream?: Log
  * relative protocol is enabled. Default: process.stdout
  * @returns a new logger instance.
  */
-declare function pino<CustomLevels extends string = never>(options: LoggerOptions<CustomLevels>, stream: DestinationStream): Logger<CustomLevels>;
+declare function pino<CustomLevels extends string = never>(options: LoggerOptions<CustomLevels>, stream?: DestinationStream | undefined): Logger<CustomLevels>;
 
 
 // Pass through all the top-level exports, allows `import {version} from "pino"`

test/types/pino.test-d.ts

@@ -107,6 +107,8 @@ pino({
     },
 });
 
+pino({}, undefined);
+
 pino({ base: null });
 if ("pino" in log) console.log(`pino version: ${log.pino}`);