add types for metricType: summary

types/index.d.ts

@@ -19,7 +19,6 @@ declare namespace express_prom_bundle {
 
   interface Opts {
     autoregister?: boolean;
-    buckets?: number[];
 
     customLabels?: { [key: string]: any };
 
@@ -31,6 +30,15 @@ declare namespace express_prom_bundle {
     bypass?: (req: Request) => boolean;
 
     metricType?: 'summary' | 'histogram';
+
+    // https://github.com/siimon/prom-client#histogram
+    buckets?: number[];
+
+    // https://github.com/siimon/prom-client#summary
+    percentiles?: number[];
+    maxAgeSeconds?: number;
+    ageBuckets?: number;
+
     metricsPath?: string;
     httpDurationMetricName?: string;
     promClient?: { collectDefaultMetrics?: DefaultMetricsCollectorConfiguration };

types/test.ts

@@ -40,7 +40,7 @@ promBundle({
     ...labels,
     year: new Date().getFullYear()
   }),
-  metricType: 'summary',
+  metricType: 'histogram',
   metricsPath: '/prometheus',
   promClient: {
     collectDefaultMetrics: {
@@ -59,6 +59,21 @@ promBundle({
   formatStatusCode: (res: Response) => res.statusCode + 100
 });
 
+promClient.register.clear();
+
+promBundle({
+  metricType: 'summary',
+  maxAgeSeconds: 600,
+  ageBuckets: 5
+});
+
+promClient.register.clear();
+
+promBundle({
+  metricType: 'summary',
+  percentiles: [0.01, 0.1, 0.9, 0.99]
+});
+
 // TypeScript workaround to write a readonly field
 type Writable<T> = { -readonly [K in keyof T]: T[K] };
 const wPromBundle: Writable<promBundle> = promBundle;