Migrate to a monorepo structure (#2909)

packages/twenty-server/src/utils/assert.ts

@@ -0,0 +1,27 @@
+import { HttpException } from '@nestjs/common';
+
+type Assert = (
+  condition: unknown,
+  message?: string,
+  ErrorType?: new (message?: string) => HttpException,
+) => asserts condition;
+
+/**
+ * assert condition and throws a HttpException
+ */
+export const assert: Assert = (condition, message, ErrorType) => {
+  if (!condition) {
+    if (ErrorType) {
+      if (message) {
+        throw new ErrorType(message);
+      }
+
+      throw new ErrorType();
+    }
+
+    throw new Error(message);
+  }
+};
+
+export const assertNotNull = <T>(item: T): item is NonNullable<T> =>
+  item !== null && item !== undefined;