make a new package for helpers

packages/helpers/prune-nullish-values.ts

@@ -0,0 +1,42 @@
+import { isObject } from "./is-object"
+
+export function pruneNullishValues<T>(input: T): PruneNullishValues<T> {
+  if (Array.isArray(input)) {
+    return input.filter(Boolean).map((item) => pruneNullishValues(item)) as any
+  }
+
+  if (!isObject(input)) {
+    return input as any
+  }
+
+  const result: any = {}
+  for (const [key, value] of Object.entries(input)) {
+    if (value != undefined) {
+      result[key] = pruneNullishValues(value)
+    }
+  }
+  return result
+}
+
+export type PruneNullishValues<Input> = Input extends object
+  ? OptionalKeys<
+      { [Key in keyof Input]: NonNullable<PruneNullishValues<Input[Key]>> },
+      KeysWithNullishValues<Input>
+    >
+  : Input
+
+type OptionalKeys<Input, Keys extends keyof Input> = Omit<Input, Keys> & {
+  [Key in Keys]?: Input[Key]
+}
+
+type KeysWithNullishValues<Input> = NonNullable<
+  Values<{
+    [Key in keyof Input]: null extends Input[Key]
+      ? Key
+      : undefined extends Input[Key]
+      ? Key
+      : never
+  }>
+>
+
+type Values<Input> = Input[keyof Input]