session, media_files/list endpoints

utility/src/index.ts

@@ -1,3 +1,4 @@
+export * from "./lib/assert";
 export * from "./lib/exists";
 export * from "./lib/match";
 export * from "./lib/types";

utility/src/lib/assert.ts

@@ -0,0 +1,8 @@
+export function assert(expression: unknown, message?: string): asserts expression {
+	if (!expression) {
+		let err = "Assertion failed";
+		if (message) err += `: ${message}`;
+
+		throw new Error(err);
+	}
+}