From 46b05aa81d294d0df0602c10f7e293ab44534c24 Mon Sep 17 00:00:00 2001
From: Tsu-ba-me <ynho.li.aa.e@gmail.com>
Date: Fri, 22 Jul 2022 20:39:23 -0400
Subject: [PATCH] fix(striker-ui): add function to simplify (not) empty checks

---
 striker-ui/lib/isEmpty.ts       | 26 ++++++++++++++++++++++++++
 striker-ui/types/MapToType.d.ts |  4 ++++
 2 files changed, 30 insertions(+)
 create mode 100644 striker-ui/lib/isEmpty.ts
 create mode 100644 striker-ui/types/MapToType.d.ts

diff --git a/striker-ui/lib/isEmpty.ts b/striker-ui/lib/isEmpty.ts
new file mode 100644
index 00000000..248ac067
--- /dev/null
+++ b/striker-ui/lib/isEmpty.ts
@@ -0,0 +1,26 @@
+type MapToValueIsEmptyFunction = {
+  [TypeName in keyof MapToType]: (value: MapToType[TypeName]) => boolean;
+};
+
+const MAP_TO_VALUE_IS_EMPTY_FUNCTION: MapToValueIsEmptyFunction = {
+  number: (value: number) => value === 0,
+  string: (value: string) => value.trim().length === 0,
+};
+
+const isEmpty = <TypeName extends keyof MapToType>(
+  values: Array<MapToType[TypeName]>,
+  { not, fn = 'every' }: { not?: boolean; fn?: 'every' | 'some' } = {},
+): boolean =>
+  values[fn]((value) => {
+    const type = typeof value as TypeName;
+
+    let result = MAP_TO_VALUE_IS_EMPTY_FUNCTION[type](value);
+
+    if (not) {
+      result = !result;
+    }
+
+    return result;
+  });
+
+export default isEmpty;
diff --git a/striker-ui/types/MapToType.d.ts b/striker-ui/types/MapToType.d.ts
new file mode 100644
index 00000000..69bfeea2
--- /dev/null
+++ b/striker-ui/types/MapToType.d.ts
@@ -0,0 +1,4 @@
+declare type MapToType = {
+  number: number;
+  string: string;
+};