feat: add invariant and nullthrow

SukkaW · Dec 21, 2023 · ca6f799 · ca6f799
1 parent 813d027
commit ca6f799
Show file tree

Hide file tree

Showing 2 changed files with 13 additions and 0 deletions.
diff --git a/src/invariant/index.ts b/src/invariant/index.ts
@@ -0,0 +1,6 @@
+/** @see https://foxact.skk.moe/invariant-nullthrow */
+export function invariant<T>(value: T): asserts value is NonNullable<T> {
+  if (value === null || value === undefined) {
+    throw new Error('Value is null or undefined');
+  }
+}
diff --git a/src/nullthrow/index.ts b/src/nullthrow/index.ts
@@ -0,0 +1,7 @@
+/** @see https://foxact.skk.moe/invariant-nullthrow */
+export const nullthrow = <T>(value: T, message = 'Value is null or undefined'): NonNullable<T> => {
+  if (value === null || value === undefined) {
+    throw new Error(message);
+  }
+  return value;
+};