Add invariant method (#780)

- Add invariant method to core.
StenaIT · Sep 4, 2024 · 5545d16 · 5545d16
1 parent 35768c7
commit 5545d16
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diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
@@ -52,3 +52,4 @@ export * from "./utils/TruthyKeysAsList";
 export * from "./utils/PropsForwarder";
 export * from "./utils/parsers/NumberParser";
 export { booleanOrNumberToNumber } from "./utils/BooleanOrNumberToNumber";
+export * from "./utils/Invariant";
diff --git a/packages/core/src/utils/Invariant.ts b/packages/core/src/utils/Invariant.ts
@@ -0,0 +1,8 @@
+export function invariant<T>(
+  val: T | null | undefined,
+  message: string
+): asserts val is T {
+  if (val == null) {
+    throw new Error("Invariant error: " + message);
+  }
+}