feat: restrict allowed context values to serializable object

Author: gajus

src/factories/createLogger.ts

@@ -79,7 +79,7 @@ export const createLogger = (
           ...parentContext,
         };
       } else {
-        context = parentContext || defaultContext;
+        context = parentContext ?? defaultContext;
       }
     } else {
       context = {
@@ -161,7 +161,7 @@ export const createLogger = (
   log.getContext = () => {
     return {
       ...getAsyncLocalContext(),
-      ...parentContext || defaultContext,
+      ...parentContext ?? defaultContext,
     };
   };
 

src/types.ts

@@ -2,9 +2,13 @@ import type {
   AsyncLocalStorage,
 } from 'async_hooks';
 
+export type JsonObject = { [key: string]: JsonValue, };
+
+export type JsonValue = JsonObject | JsonValue[] | boolean | number | string | null;
+
 export type LogWriter = (message: string) => void;
 
-export type MessageContext = any;
+export type MessageContext = JsonObject;
 
 export type RoarrGlobalState = {
   asyncLocalStorage?: AsyncLocalStorage<MessageContext>,