test: add type definition for fetch

bravemaster619 · bravemaster619 · commit 97fea68ad89f · 2020-08-11T15:09:22.000+08:00
diff --git a/_src/test/typedefinition_test.ts b/_src/test/typedefinition_test.ts
@@ -45,6 +45,22 @@ interface TypeSample {
 	result = cache.set<TypeSample>(key, value);
 }
 
+{
+	let cache: NodeCache;
+	let key: string;
+	let ttl: number | string;
+	let result: TypeSample;
+	let func = (): TypeSample => {
+		return {
+			a: 1,
+			b: 'foo',
+			c: true
+		};
+	};
+	result = cache.fetch<TypeSample>(key, func);
+	result = cache.fetch<TypeSample>(key, ttl, func);
+}
+
 {
 	let cache: NodeCache;
 	let keys: string | string[];
