use-export-json.ts

Overview

The use-export-json.ts file defines a custom React hook named useHandleExportJsonFile that provides functionality to export data as a JSON file. Specifically, it prepares a DSL (Domain-Specific Language) graph data structure and triggers a download of this data as a JSON file named after a dynamic title fetched from an external data source.

This hook is intended to be used within React components where exporting the DSL graph to a JSON file is required, encapsulating the logic related to data retrieval and file download in a reusable manner.

Detailed Explanation

useHandleExportJsonFile

Description

A custom React hook that:

• Retrieves DSL graph data via the useBuildDslData hook.

• Retrieves metadata (including a file title) via the useFetchAgent hook.

• Creates a callback function to export the graph data as a JSON file.

• Returns the export handler function for use in components.

This hook abstracts the process of preparing and exporting the JSON file, making it easy to integrate export functionality into UI components.

Usage

import { useHandleExportJsonFile } from './use-export-json';

const ExportButton = () => {
  const { handleExportJson } = useHandleExportJsonFile();

  return (
    <button onClick={handleExportJson}>
      Export Graph as JSON
    </button>
  );
};

When the button is clicked, the DSL graph data is serialized and downloaded as a JSON file named according to the current data.title.

Imports Breakdown

Functions and Methods

handleExportJson

• Type: () => void

• Description: Memoized callback function that:

  • Calls buildDslData() to get the graph object.

  • Uses downloadJsonFile util to download the graph as a JSON file.

• Dependencies: React's useCallback dependency array includes buildDslData and data.title, ensuring the function updates when either changes.

• Parameters: None

• Returns: None (side effect: triggers file download)

• Example:

handleExportJson(); // Initiates download of `${data.title}.json` containing the DSL graph

Implementation Details

• The hook tightly couples the retrieval of graph data and metadata (title) to ensure consistent and meaningful file naming.

• Uses useCallback to prevent unnecessary re-renders or re-creations of handleExportJson when dependencies have not changed.

• The actual file download is delegated to downloadJsonFile, which abstracts browser-specific implementations for file saving.

• buildDslData is called at the time of export to ensure the most up-to-date graph data is used.

Interaction with Other Parts of the System

• useBuildDslData hook: Provides the core DSL graph data structure that represents domain-specific information in the application.

• useFetchAgent hook: Supplies metadata such as the file title, likely fetched from a remote or global state source.

• downloadJsonFile utility: Handles JSON file creation and download logic, abstracting away browser API details.

• This hook is designed to be imported into React UI components that require the ability to export current DSL graph data as a JSON file.

• The DSL graph structure and the agent data are presumably managed elsewhere in the application, with this hook serving as a bridge to export that data.

Mermaid Diagram

flowchart TD
    A[useHandleExportJsonFile Hook] --> B[useBuildDslData]
    A --> C[useFetchAgent]
    A --> D[handleExportJson Callback]
    D --> E[buildDslData().graph]
    D --> F[downloadJsonFile(graph, filename)]
    C --> G[data.title]
    F --> H[Triggers JSON file download named data.title.json]

Summary

The use-export-json.ts file provides a focused custom React hook that simplifies exporting DSL graph data as a JSON file with a dynamic filename. It integrates tightly with domain-specific data hooks and utility functions to deliver this functionality in a reusable and performant way, enabling seamless export features across the application UI.