better type signature for undefinedIfEmpty

packages/merchant-backoffice-ui/src/components/form/InputPaytoForm.tsx

@@ -22,6 +22,7 @@ import { h, VNode, Fragment } from "preact";
 import { useCallback, useState } from "preact/hooks";
 import { Translate, Translator, useTranslator } from "../../i18n/index.js";
 import { COUNTRY_TABLE } from "../../utils/constants.js";
+import { undefinedIfEmpty } from "../../utils/table.js";
 import { FormErrors, FormProvider } from "./FormProvider.js";
 import { Input } from "./Input.js";
 import { InputGroup } from "./InputGroup.js";
@@ -154,12 +155,6 @@ const targets = [
 const noTargetValue = targets[0];
 const defaultTarget = { target: noTargetValue, options: {} };
 
-function undefinedIfEmpty<T>(obj: T): T | undefined {
-  return Object.keys(obj).some((k) => (obj as any)[k] !== undefined)
-    ? obj
-    : undefined;
-}
-
 export function InputPaytoForm<T>({
   name,
   readonly,

packages/merchant-backoffice-ui/src/paths/admin/create/CreatePage.tsx

@@ -33,6 +33,7 @@ import { Translate, useTranslator } from "../../../i18n/index.js";
 import { DefaultInstanceFormFields } from "../../../components/instance/DefaultInstanceFormFields.js";
 import { INSTANCE_ID_REGEX, PAYTO_REGEX } from "../../../utils/constants.js";
 import { Amounts } from "@gnu-taler/taler-util";
+import { undefinedIfEmpty } from "../../../utils/table.js";
 
 export type Entity = MerchantBackend.Instances.InstanceConfigurationMessage & {
   auth_token?: string;
@@ -54,12 +55,6 @@ function with_defaults(id?: string): Partial<Entity> {
   };
 }
 
-function undefinedIfEmpty<T>(obj: T): T | undefined {
-  return Object.keys(obj).some((k) => (obj as any)[k] !== undefined)
-    ? obj
-    : undefined;
-}
-
 export function CreatePage({ onCreate, onBack, forceId }: Props): VNode {
   const [value, valueHandler] = useState(with_defaults(forceId));
   const [isTokenSet, updateIsTokenSet] = useState<boolean>(false);

packages/merchant-backoffice-ui/src/paths/instance/orders/create/CreatePage.tsx

@@ -42,6 +42,7 @@ import { InventoryProductForm } from "../../../../components/product/InventoryPr
 import { NonInventoryProductFrom } from "../../../../components/product/NonInventoryProductForm.js";
 import { InputNumber } from "../../../../components/form/InputNumber.js";
 import { InputBoolean } from "../../../../components/form/InputBoolean.js";
+import { undefinedIfEmpty } from "../../../../utils/table.js";
 
 interface Props {
   onCreate: (d: MerchantBackend.Orders.PostOrderRequest) => void;
@@ -126,12 +127,6 @@ const stringIsValidJSON = (value: string) => {
   }
 };
 
-function undefinedIfEmpty<T>(obj: T): T | undefined {
-  return Object.keys(obj).some((k) => (obj as any)[k] !== undefined)
-    ? obj
-    : undefined;
-}
-
 export function CreatePage({
   onCreate,
   onBack,

packages/merchant-backoffice-ui/src/paths/instance/update/UpdatePage.tsx

@@ -34,6 +34,7 @@ import { Translate, useTranslator } from "../../../i18n/index.js";
 import { DefaultInstanceFormFields } from "../../../components/instance/DefaultInstanceFormFields.js";
 import { PAYTO_REGEX } from "../../../utils/constants.js";
 import { Amounts } from "@gnu-taler/taler-util";
+import { undefinedIfEmpty } from "../../../utils/table.js";
 
 type Entity = MerchantBackend.Instances.InstanceReconfigurationMessage & {
   auth_token?: string;
@@ -70,12 +71,6 @@ function getTokenValuePart(t?: string): string | undefined {
   return match[1];
 }
 
-function undefinedIfEmpty<T>(obj: T): T | undefined {
-  return Object.keys(obj).some((k) => (obj as any)[k] !== undefined)
-    ? obj
-    : undefined;
-}
-
 export function UpdatePage({
   onUpdate,
   onChangeAuth,

packages/merchant-backoffice-ui/src/utils/table.ts

@@ -35,3 +35,19 @@ export function buildActions<T extends WithId>(instances: T[], selected: string[
     .filter(notEmpty)
     .map(id => ({ element: id, type: action }))
 }
+
+/**
+ * For any object or array, return the same object if is not empty.
+ * not empty: 
+ *  - for arrays: at least one element not undefined
+ *  - for objects: at least one property not undefined
+ * @param obj 
+ * @returns 
+ */
+export function undefinedIfEmpty<T extends Record<string, unknown>|Array<unknown>>(obj: T): T | undefined {
+  if (obj === undefined) return undefined
+  return Object.values(obj).some((v) => v !== undefined)
+    ? obj
+    : undefined;
+}
+