Modal — Complete Guide Skill

Modal — Complete Guide

Every modal consists of up to three files:

Store — Zustand store to control open state and typed data
Modal — The modal UI component
Open Button — (optional) Only create this when explicitly requested

Path Resolution

Before creating any files, invoke the finstreet-fe:path-resolver skill with your input parameters (featureName, subFeatureName, featureType, product, role) to resolve the correct paths. Use the returned Feature Path as {parentDirectory} in the directory structure below.

Directory Structure

{parentDirectory}/
  ├── store.ts
  ├── {ModalName}Modal.tsx
  └── Open{ModalName}ModalButton.tsx   ← only if requested

1. Store

File: store.ts

import { create } from "zustand";

type {ModalName}ModalData = {
  financingCaseId: string;
} | null;

interface {ModalName}ModalStore {
  isOpen: boolean;
  data: {ModalName}ModalData;
  setIsOpen: (isOpen: boolean) => void;
  setData: (data: {ModalName}ModalData) => void;
}

export const use{ModalName}Modal = create<{ModalName}ModalStore>((set) => ({
  isOpen: false,
  data: null,
  setIsOpen: (isOpen) => set({ isOpen }),
  setData: (data) => set({ data, isOpen: true }),
}));

data holds the typed payload the modal needs (e.g., IDs passed from the trigger)
setData always sets isOpen: true — opening and setting data happen together
Shape the {ModalName}ModalData type to match exactly what the modal content needs

2. Modal Component

File: {ModalName}Modal.tsx

"use client";

import {
  Modal,
  ModalContent,
  ModalTitle,
} from "@finstreet/ui/components/patterns/Modal";
import { use{ModalName}Modal } from "./store";
import { Suspense } from "react";
import { useExtracted } from "next-intl";
import { Headline } from "@finstreet/ui/components/base/Headline";
import { Typography } from "@finstreet/ui/components/base/Typography";
import { VStack } from "@styled-system/jsx";

export const {ModalName}Modal = () => {
  const { isOpen, data, setIsOpen } = use{ModalName}Modal();
  const t = useExtracted();

  if (!data) {
    return null;
  }

  const { financingCaseId } = data;

  return (
    <Modal open={isOpen} onClose={() => setIsOpen(false)}>
      <ModalTitle>
        {/* See title patterns below */}
      </ModalTitle>
      <ModalContent>
        {/* Modal content here */}
      </ModalContent>
    </Modal>
  );
};

ModalTitle variants

Use exactly one of these based on whether a subheading is present in the context:

With title and subheading:

<ModalTitle>
  <VStack gap={1} alignItems={"flex-start"}>
    <Headline>{t("{German title}")}</Headline>
    <Typography color={"text.dark"}>{t("{German subheading}")}</Typography>
  </VStack>
</ModalTitle>

Title only (no subheading):

<ModalTitle>
  {t("{German title}")}
</ModalTitle>

Rules

Always guard with if (!data) return null before destructuring data
Wrap async content (e.g., forms with server actions) in <Suspense>
Hardcoded strings are acceptable — translations are cleaned up separately

3. Open Button (optional)

File: Open{ModalName}ModalButton.tsx

Only create this file when explicitly asked to.

"use client";

import { use{ModalName}Modal } from "./store";
import { Button } from "@finstreet/ui/components/base/Button";
import { useExtracted } from "next-intl";

type Open{ModalName}ModalButtonProps = {
  financingCaseId: string;
};

export const Open{ModalName}ModalButton = ({
  financingCaseId,
}: Open{ModalName}ModalButtonProps) => {
  const { setData } = use{ModalName}Modal();
  const t = useExtracted();

  return (
    <Button onClick={() => setData({ financingCaseId })}>
      {t("{German button label}")}
    </Button>
  );
};

Call setData (not setIsOpen) from the button — setData already opens the modal
Props must match the {ModalName}ModalData type from the store

Agent Skills: Modal — Complete Guide

Install this agent skill to your local

Skill Files