1 files changed, 12 insertions, 0 deletions
diff --git a/Timeline/ClientApp/src/app/utilities/language-untilities.ts b/Timeline/ClientApp/src/app/utilities/language-untilities.ts
new file mode 100644
index 00000000..be9df2dc
--- /dev/null
+++ b/Timeline/ClientApp/src/app/utilities/language-untilities.ts
@@ -0,0 +1,12 @@
+export function nullIfUndefined<T>(value: T | undefined): T | null {
+  return value === undefined ? null : value;
+}
+
+export function throwIfNullOrUndefined<T>(value: T | null | undefined,
+  lazyMessage: () => string = () => 'Value mustn\'t be falsy'): T | never {
+  if (value === null || value === undefined) {
+    throw new Error(lazyMessage());
+  } else {
+    return value;
+  }
+}