guard

packages/insomnia/src/utils/guard.ts

@@ -0,0 +1,15 @@
+// Throw an error if the condition fails
+// > Not providing an inline default argument for message as the result is smaller
+export function guard(
+  condition: any,
+  // Can provide a string, or a function that returns a string for cases where
+  // the message takes a fair amount of effort to compute
+  message?: string | (() => string),
+): asserts condition {
+  if (condition) {
+    return;
+  }
+  // Condition not passed
+
+  throw new Error(typeof message === 'function' ? message() : message);
+}