move helpers to new workspace folder

2022-10-14 13:22:55 -05:00
parent acbf21842f
commit 0be321b64e
29 changed files with 284 additions and 36 deletions
--- a/packages/helpers/is-instance-of.ts
+++ b/packages/helpers/is-instance-of.ts
@@ -0,0 +1,7 @@
+/**
+ * for narrowing instance types with array.filter
+ */
+export const isInstanceOf =
+  <T>(Constructor: new (...args: any[]) => T) =>
+  (value: unknown): value is T =>
+    value instanceof Constructor