From 2884ab524d2f60350a9535f4d64fe0821812e534 Mon Sep 17 00:00:00 2001
From: Alex Holliday <ajhollid@gmail.com>
Date: Tue, 10 Mar 2026 11:35:05 -0700
Subject: [PATCH 1/2] type fetchMonitorCertificate

---
 server/src/controllers/controllerUtils.ts | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/server/src/controllers/controllerUtils.ts b/server/src/controllers/controllerUtils.ts
index e5c852591..173790cda 100755
--- a/server/src/controllers/controllerUtils.ts
+++ b/server/src/controllers/controllerUtils.ts
@@ -1,11 +1,12 @@
 import { AppError } from "@/utils/AppError.js";
-import { type MonitorType, MonitorTypes, UserRole } from "@/types/index.js";
+import { Monitor, type MonitorType, MonitorTypes, UserRole } from "@/types/index.js";
+type SslCertificate = { valid: boolean; validFrom: string; validTo: string; daysRemaining: number; validFor?: string[] };
+type SslChecker = (host: string, options?: Record<string, unknown>) => Promise<SslCertificate>;
 
-const fetchMonitorCertificate = async (sslChecker: any, monitor: any): Promise<any> => {
+const fetchMonitorCertificate = async (checker: SslChecker, monitor: Monitor): Promise<SslCertificate> => {
 	const monitorUrl = new URL(monitor.url);
 	const hostname = monitorUrl.hostname;
-	const cert = await sslChecker(hostname);
-	// Throw an error if no cert or if cert.validTo is not present
+	const cert = await checker(hostname);
 	if (cert?.validTo === null || cert?.validTo === undefined) {
 		throw new Error("Certificate not found");
 	}

From cb5316e6f568ad615f96364f2554715e59816292 Mon Sep 17 00:00:00 2001
From: Alex Holliday <ajhollid@gmail.com>
Date: Wed, 11 Mar 2026 10:48:12 -0700
Subject: [PATCH 2/2] fix ssl-checker type

---
 server/src/controllers/controllerUtils.ts |  6 +++---
 server/src/types/ssl-checker.d.ts         | 24 +++++++++++++++++++++++
 2 files changed, 27 insertions(+), 3 deletions(-)
 create mode 100644 server/src/types/ssl-checker.d.ts

diff --git a/server/src/controllers/controllerUtils.ts b/server/src/controllers/controllerUtils.ts
index 173790cda..f8447fd59 100755
--- a/server/src/controllers/controllerUtils.ts
+++ b/server/src/controllers/controllerUtils.ts
@@ -1,9 +1,9 @@
 import { AppError } from "@/utils/AppError.js";
 import { Monitor, type MonitorType, MonitorTypes, UserRole } from "@/types/index.js";
-type SslCertificate = { valid: boolean; validFrom: string; validTo: string; daysRemaining: number; validFor?: string[] };
-type SslChecker = (host: string, options?: Record<string, unknown>) => Promise<SslCertificate>;
+import sslChecker, { SSLDetails } from "ssl-checker";
+type SSLCheckerType = typeof sslChecker;
 
-const fetchMonitorCertificate = async (checker: SslChecker, monitor: Monitor): Promise<SslCertificate> => {
+const fetchMonitorCertificate = async (checker: SSLCheckerType, monitor: Monitor): Promise<SSLDetails> => {
 	const monitorUrl = new URL(monitor.url);
 	const hostname = monitorUrl.hostname;
 	const cert = await checker(hostname);
diff --git a/server/src/types/ssl-checker.d.ts b/server/src/types/ssl-checker.d.ts
new file mode 100644
index 000000000..bcbc39858
--- /dev/null
+++ b/server/src/types/ssl-checker.d.ts
@@ -0,0 +1,24 @@
+declare module "ssl-checker" {
+	import { Agent } from "https";
+
+	export interface SSLDetails {
+		daysRemaining: number;
+		valid: boolean;
+		validFrom: string;
+		validTo: string;
+		validFor: string[];
+	}
+
+	export interface SSLOptions {
+		method?: "GET" | "HEAD";
+		port?: number;
+		agent?: Agent;
+		rejectUnauthorized?: boolean;
+		validateSubjectAltName?: boolean;
+	}
+
+	function sslChecker(hostname: string, options?: SSLOptions): Promise<SSLDetails>;
+
+	// Change 'export default' to 'export =' to allow it to be callable
+	export = sslChecker;
+}