fix: ensure we only throw something of type Error

docs/oidc-client-ts.api.md

@@ -218,7 +218,7 @@ export class Logger {
     // (undocumented)
     static info(name: string, ...args: unknown[]): void;
     // (undocumented)
-    throw(err: unknown): never;
+    throw(err: Error): never;
     // (undocumented)
     warn(...args: unknown[]): void;
     // (undocumented)

src/SessionMonitor.ts

@@ -18,7 +18,7 @@ export class SessionMonitor {
 
     public constructor(private readonly _userManager: UserManager) {
         if (!_userManager) {
-            this._logger.throw("No user manager passed to SessionMonitor");
+            this._logger.throw(new Error("No user manager passed"));
         }
 
         this._userManager.events.addUserLoaded(this._start);

src/utils/Logger.ts

@@ -89,7 +89,7 @@ export class Logger {
         }
     }
 
-    public throw(err: unknown): never {
+    public throw(err: Error): never {
         this.error(err);
         throw err;
     }