refactor: use strict typing

apps/server/src/utils/assert.ts

@@ -1,29 +1,31 @@
+import { is } from './is.js';
+
 export function isString(value: unknown): asserts value is string {
-  if (typeof value !== 'string') {
+  if (!is.string(value)) {
     throw new Error(`Unexpected payload type: ${String(value)}`);
   }
 }
 
 export function isDefined<T>(value: T | undefined): asserts value is T {
-  if (value === undefined) {
+  if (!is.defined(value)) {
     throw new Error('Payload not found');
   }
 }
 
 export function isNumber(value: unknown): asserts value is number {
-  if (typeof value !== 'number') {
+  if (!is.number(value)) {
     throw new Error(`Unexpected payload type: ${String(value)}`);
   }
 }
 
 export function isObject(value: unknown): asserts value is object {
-  if (typeof value !== 'object' || value === null || Array.isArray(value)) {
+  if (!is.object(value)) {
     throw new Error(`Unexpected payload type: ${String(value)}`);
   }
 }
 
 export function isArray(value: unknown): asserts value is unknown[] {
-  if (!Array.isArray(value)) {
+  if (!is.array(value)) {
     throw new Error(`Unexpected payload type: ${String(value)}`);
   }
 }
@@ -32,9 +34,7 @@ export function hasKeys<T extends object, K extends keyof any>(
   value: T,
   keys: K[],
 ): asserts value is T & Record<K, unknown> {
-  for (const key of keys) {
-    if (!(key in value)) {
-      throw new Error(`Key not found: ${String(key)}`);
-    }
+  if (!is.objectWithKeys(value, keys)) {
+    throw new Error(`Unexpected payload type: ${String(value)}`);
   }
 }