feat(logging): allow pino to be configured (#97)

src/index.ts

@@ -23,7 +23,7 @@ import {
 } from './types';
 export {Changes} from './types';
 import {Octokit} from '@octokit/rest';
-import {Logger} from 'pino';
+import {Logger, LoggerOptions} from 'pino';
 import {logger, setupLogger} from './logger';
 import {addPullRequestDefaults} from './default-options-handler';
 import * as retry from 'async-retry';
@@ -55,7 +55,7 @@ async function createPullRequest(
   octokit: Octokit,
   changes: Changes | null | undefined,
   options: CreatePullRequestUserOptions,
-  loggerOption?: Logger
+  loggerOption?: Logger | LoggerOptions
 ): Promise<number> {
   setupLogger(loggerOption);
   // if null undefined, or the empty map then no changes have been provided.

src/logger/index.ts

@@ -16,8 +16,12 @@ import {Logger, Level} from 'pino';
 import * as Pino from 'pino';
 let logger: Logger;
 
-function setupLogger(userLogger: Logger = Pino()) {
-  logger = userLogger;
+function setupLogger(userLogger?: Logger | Pino.LoggerOptions) {
+  if (typeof userLogger === 'undefined' || typeof userLogger === 'object') {
+    logger = Pino(userLogger);
+  } else {
+    logger = userLogger as Logger;
+  }
 }
 
 export {logger, Logger, Level, setupLogger};