fix(listAtom): validate controls listErrors & calls nested form valid…

src/atoms/index.ts

@@ -0,0 +1 @@
+export * from "./list-atom";

src/atoms/list-atom/listAtom.test.ts

@@ -2,6 +2,7 @@ import { act, renderHook } from "@testing-library/react";
 import {
   formAtom,
   useFieldActions,
+  useFieldErrors,
   useFieldValue,
   useFormActions,
   useFormSubmit,
@@ -12,6 +13,7 @@ import { describe, expect, it, test, vi } from "vitest";
 import { listAtom } from "./listAtom";
 import { numberField, textField } from "../../fields";
 import { useFieldError } from "../../hooks";
+import { useListActions } from "../../hooks/use-list-actions";
 
 describe("listAtom()", () => {
   test("can be submitted within formAtom", async () => {
@@ -126,6 +128,50 @@ describe("listAtom()", () => {
     });
   });
 
+  describe("validation", () => {
+    it("adding item clear the error", async () => {
+      const field = listAtom({
+        value: [],
+        builder: (value) => numberField({ value }),
+        validate: ({ value }) => {
+          const errors = [];
+          if (value.length === 0) {
+            errors.push("Can't be empty");
+          }
+          return errors;
+        },
+      });
+
+      const { result: actions } = renderHook(() => useFieldActions(field));
+      const { result: errors } = renderHook(() => useFieldErrors(field));
+
+      await act(async () => actions.current.validate());
+
+      expect(errors.current).toEqual(["Can't be empty"]);
+
+      const { result: listActions } = renderHook(() => useListActions(field));
+
+      await act(async () => listActions.current.add());
+
+      expect(errors.current).toEqual([]);
+    });
+
+    it("validates the inner form items", async () => {
+      const field = listAtom({
+        value: [undefined],
+        invalidItemError: "err",
+        builder: (value) => numberField({ value }),
+      });
+
+      const { result: actions } = renderHook(() => useFieldActions(field));
+      const { result: errors } = renderHook(() => useFieldErrors(field));
+
+      await act(async () => actions.current.validate());
+
+      expect(errors.current).toEqual(["err"]);
+    });
+  });
+
   describe("nested validation", () => {
     it("can't be submitted with invalid item's field", async () => {
       const field = listAtom({

src/atoms/list-atom/listAtom.ts

@@ -18,6 +18,14 @@ import {
 } from "./listBuilder";
 import { ExtendFieldAtom } from "../extendFieldAtom";
 
+type ListItemForm<Fields extends ListAtomItems> = FormAtom<{
+  fields: Fields;
+}>;
+
+export type ListItem<Fields extends ListAtomItems> = PrimitiveAtom<
+  ListItemForm<Fields>
+>;
+
 // copied from jotai/utils
 type SplitAtomAction<Item> =
   | {
@@ -42,10 +50,16 @@ export type ListAtom<
   Value[],
   {
     empty: Atom<boolean>;
+    /**
+     * TODO - review
+     * Reusing the ListItem and ListItemForm from above will cause an error preventing compilation the library:
+     * error TS7056: The inferred type of this node exceeds the maximum length the compiler will serialize. An explicit type annotation is needed.
+     */
     buildItem(): FormAtom<{
       fields: Fields;
     }>;
     _formFields: Atom<Fields[]>;
+
     _formList: PrimitiveAtom<
       FormAtom<{
         fields: Fields;
@@ -150,7 +164,7 @@ export function listAtom<
     // eslint-disable-next-line @typescript-eslint/no-unused-vars
     (_get, _set, _value: string[]) => {
       // intentional NO-OP
-      // the errors atom must be writable, as the `validateAtoms` will write the errors returned from `_validateCallback`
+      // the errors atom must be writable, as the `validateAtom` will write the errors returned from `_validateCallback`
       // but we ignore it, as we already manage the `listErrors` internally
     },
   );
@@ -223,6 +237,13 @@ export function listAtom<
           set(touchedAtom, true);
         }
 
+        // run validation for nested forms
+        await Promise.all(
+          get(_formListAtom).map((formAtom) =>
+            validateFormFields(formAtom as any, get, set, event),
+          ),
+        );
+
         let errors: string[] = [];
 
         const maybeValidatePromise = config.validate?.({
@@ -237,13 +258,13 @@ export function listAtom<
         if (isPromise(maybeValidatePromise)) {
           ptr === get(validateCountAtom) &&
             set(validateResultAtom, "validating");
-          errors = (await maybeValidatePromise) ?? get(errorsAtom);
+          errors = (await maybeValidatePromise) ?? get(listErrorsAtom);
         } else {
-          errors = maybeValidatePromise ?? get(errorsAtom);
+          errors = maybeValidatePromise ?? get(listErrorsAtom);
         }
 
         if (ptr === get(validateCountAtom)) {
-          set(errorsAtom, errors);
+          set(listErrorsAtom, errors);
           set(validateResultAtom, errors.length > 0 ? "invalid" : "valid");
         }
       }

src/components/list/List.tsx

@@ -2,9 +2,9 @@ import { FieldAtom, FormFields } from "form-atoms";
 import { Fragment, useCallback } from "react";
 import { RenderProp } from "react-render-prop-type";
 
-import { ListAtomItems, ListAtomValue } from "../../atoms/list-atom";
+import { ListAtomItems, ListAtomValue, ListItem } from "../../atoms/list-atom";
 import { type ListField } from "../../fields";
-import { ListItem, useListField } from "../../hooks";
+import { useListField } from "../../hooks";
 
 export type RemoveButtonProps = { remove: () => void };
 export type RemoveButtonProp = RenderProp<RemoveButtonProps, "RemoveButton">;

src/hooks/index.ts

@@ -5,6 +5,7 @@ export * from "./use-date-field-props";
 export * from "./use-field-error";
 export * from "./use-field-props";
 export * from "./use-files-field-props";
+export * from "./use-list-actions";
 export * from "./use-list-field";
 export * from "./use-multiselect-field-props";
 export * from "./use-number-field-props";

src/hooks/use-list-actions/index.ts

@@ -0,0 +1 @@
+export * from "./useListActions";

src/hooks/use-list-actions/useListActions.ts

@@ -0,0 +1,46 @@
+import { UseFieldOptions } from "form-atoms";
+import { useAtomValue, useSetAtom } from "jotai";
+import { useCallback, useTransition } from "react";
+
+import {
+  ListAtom,
+  ListAtomItems,
+  ListAtomValue,
+  ListItem,
+} from "../../atoms/list-atom";
+
+export const useListActions = <
+  Fields extends ListAtomItems,
+  Value extends ListAtomValue<Fields>,
+>(
+  list: ListAtom<Fields, Value>,
+  options?: UseFieldOptions<Value[]>,
+) => {
+  const atoms = useAtomValue(list);
+  const validate = useSetAtom(atoms.validate, options);
+  const dispatchSplitList = useSetAtom(atoms._splitList);
+  const [, startTransition] = useTransition();
+
+  const remove = useCallback((item: ListItem<Fields>) => {
+    dispatchSplitList({ type: "remove", atom: item });
+    startTransition(() => {
+      validate("change");
+    });
+  }, []);
+
+  const add = useCallback((before?: ListItem<Fields>) => {
+    dispatchSplitList({ type: "insert", value: atoms.buildItem(), before });
+    startTransition(() => {
+      validate("change");
+    });
+  }, []);
+
+  const move = useCallback(
+    (item: ListItem<Fields>, before?: ListItem<Fields>) => {
+      dispatchSplitList({ type: "move", atom: item, before });
+    },
+    [],
+  );
+
+  return { remove, add, move };
+};

src/hooks/use-list-field/useListField.ts

@@ -1,15 +1,9 @@
-import { FormAtom, UseFieldOptions, useFieldInitialValue } from "form-atoms";
-import { PrimitiveAtom, useAtom, useAtomValue, useSetAtom } from "jotai";
-import { useCallback, useTransition } from "react";
+import { UseFieldOptions, useFieldInitialValue } from "form-atoms";
+import { useAtomValue } from "jotai";
 
 import { ListAtomItems, ListAtomValue } from "../../atoms/list-atom";
 import { ListField } from "../../fields";
-
-export type ListItem<Fields extends ListAtomItems> = PrimitiveAtom<
-  FormAtom<{
-    fields: Fields;
-  }>
->;
+import { useListActions } from "../use-list-actions";
 
 export const useListField = <
   Fields extends ListAtomItems,
@@ -19,35 +13,13 @@ export const useListField = <
   options?: UseFieldOptions<Value[]>,
 ) => {
   const atoms = useAtomValue(list);
-  const validate = useSetAtom(atoms.validate, options);
-  const [splitItems, dispatch] = useAtom(atoms._splitList);
+  const splitItems = useAtomValue(atoms._splitList);
   const formList = useAtomValue(atoms._formList);
   const formFields = useAtomValue(atoms._formFields);
   const isEmpty = useAtomValue(atoms.empty);
-  const [, startTransition] = useTransition();
+  const { add, move, remove } = useListActions(list);
   useFieldInitialValue(list, options?.initialValue, options);
 
-  const remove = useCallback((item: ListItem<Fields>) => {
-    dispatch({ type: "remove", atom: item });
-    startTransition(() => {
-      validate("change");
-    });
-  }, []);
-
-  const add = useCallback((before?: ListItem<Fields>) => {
-    dispatch({ type: "insert", value: atoms.buildItem(), before });
-    startTransition(() => {
-      validate("change");
-    });
-  }, []);
-
-  const move = useCallback(
-    (item: ListItem<Fields>, before?: ListItem<Fields>) => {
-      dispatch({ type: "move", atom: item, before });
-    },
-    [],
-  );
-
   const items = splitItems.map((item, index) => ({
     item,
     key: `${formList[index]}`,

src/index.ts

@@ -1,3 +1,4 @@
+export * from "./atoms";
 export * from "./components";
 export * from "./fields";
 export * from "./hooks";