===============
LIBRARY RULES
===============
From library maintainers:
- react-mediadrop is headless — it has no bundled UI components, only the useMediaDrop hook and transport contract
- Do not invent APIs that aren't documented here — check apps/docs/docs/reference for the exact exported types and hook signature
- Uploads require a transport implementing UploadTransport, supplied via useMediaDrop({ transport }); react-mediadrop/xhr-upload provides createXhrUploadTransport() as a reference transport

### Project Installation and Build Commands

Source: https://github.com/autorender/react-mediadrop/blob/main/README.md

Installs project dependencies, builds the project, runs tests, performs type checking, linting, and checks package sizes.

```sh
pnpm install
pnpm build
pnpm test
pnpm typecheck
pnpm lint
pnpm size    # checks each published/bundled package's gzipped dist against its size budget
```

--------------------------------

### Install react-mediadrop with pnpm

Source: https://github.com/autorender/react-mediadrop/blob/main/README.md

Install the react-mediadrop package using pnpm. Alternative npm and yarn commands are also provided.

```sh
pnpm add react-mediadrop
# or: npm install react-mediadrop
# or: yarn add react-mediadrop
```

--------------------------------

### Styling Example

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(basics)/styling.mdx

Demonstrates how to apply custom styling to the react-mediadrop component. This example shows the flexibility in controlling the appearance of the dropzone.

```tsx
import React from 'react';
import { useDropzone } from 'react-mediadrop';

function StylingExample() {
  const { getRootProps, getInputProps } = useDropzone({
    onDrop: (acceptedFiles) => {
      console.log(acceptedFiles);
    },
  });

  return (
    <div
      {...getRootProps({
        style: {
          border: '2px dashed #ccc',
          padding: '20px',
          textAlign: 'center',
          cursor: 'pointer',
        },
        className: 'my-dropzone',
      })}
    >
      <input {...getInputProps()} />
      <p>Drag and drop some files here</p>
    </div>
  );
}

export default StylingExample;
```

--------------------------------

### Install and Verify Project Dependencies

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/project/contributing.mdx

Run these commands to install dependencies and verify the project's integrity. This sequence mirrors the checks performed by the Continuous Integration (CI) system.

```sh
pnpm install
pnpm lint && pnpm typecheck && pnpm test && pnpm build && pnpm size
```

--------------------------------

### Displaying Drag States with useMediaDrop

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(basics)/drag-states.mdx

This example shows how to use the `useMediaDrop` hook to get live drag and focus flags. Drag an image over the dropzone to observe the flags change.

```tsx
import { useMediaDrop } from "@/index.js";
import { useState } from "react";

const DragStatesExample = () => {
  const [isDragAccept, setIsDragAccept] = useState(false);
  const [isDragReject, setIsDragReject] = useState(false);
  const [isDragActive, setIsDragActive] = useState(false);
  const [isDragGlobal, setIsDragGlobal] = useState(false);
  const [isDragLeave, setIsDragLeave] = useState(false);

  const { dragEvents } = useMediaDrop({
    onDragEnter: () => {
      setIsDragActive(true);
      setIsDragLeave(false);
    },
    onDragLeave: () => {
      setIsDragActive(false);
      setIsDragLeave(true);
    },
    onDragAccept: () => {
      setIsDragAccept(true);
      setIsDragReject(false);
    },
    onDragReject: () => {
      setIsDragAccept(false);
      setIsDragReject(true);
    },
    onDragOver: (e) => {
      setIsDragGlobal(e.isDragGlobal);
    },
    onDrop: () => {
      setIsDragActive(false);
      setIsDragAccept(false);
      setIsDragReject(false);
      setIsDragLeave(false);
    },
  });

  return (
    <div {...dragEvents}>
      <p>Drag an image over this area.</p>
      <ul>
        <li>isDragAccept: {isDragAccept.toString()}</li>
        <li>isDragReject: {isDragReject.toString()}</li>
        <li>isDragActive: {isDragActive.toString()}</li>
        <li>isDragGlobal: {isDragGlobal.toString()}</li>
        <li>isDragLeave: {isDragLeave.toString()}</li>
      </ul>
    </div>
  );
};

export default DragStatesExample;
```

--------------------------------

### Run Backend and Frontend Demos

Source: https://github.com/autorender/react-mediadrop/blob/main/README.md

Starts the test server backend and the react-mediadrop frontend development server in separate terminals.

```sh
# terminal 1 — backend, listens on http://localhost:8787
pnpm --filter test-server dev

# terminal 2 — frontend
pnpm --filter react-demo dev
```

--------------------------------

### React MediaDrop Upload Progress Example

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(uploads)/upload-progress.mdx

This example shows how to integrate upload progress tracking into your React MediaDrop application. It utilizes the `uploadFile` function and reads `progress` and `uploadStatus` from `MediaDropFile` to render a progress bar. The transport is simulated for documentation purposes.

```tsx
import { MediaDropFile } from "react-mediadrop";

// Assume uploadFile is imported from your MediaDrop instance
// declare function uploadFile(id: string): void;

interface UploadProgressProps {
  file: MediaDropFile;
}

export function UploadProgress({
  file: {
    id,
    progress,
    uploadStatus,
    size,
    name,
    type,
    lastModified,
    preview,
    error,
    data,
  },
}: UploadProgressProps) {
  const max = progress?.total ?? size;

  return (
    <div className="upload-progress">
      <div className="file-info">
        <span>{name}</span>
        <span>{type}</span>
      </div>
      <div className="progress-bar-container">
        <div
          className="progress-bar"
          style={{
            width: max ? `${(progress?.loaded / max) * 100}%` : "0%",
          }}
        ></div>
      </div>
      <div className="status-info">
        <span>
          {uploadStatus === "uploading"
            ? `Uploading ${progress?.loaded ?? 0} / ${max} bytes`
            : uploadStatus}
        </span>
      </div>
    </div>
  );
}

// Example usage (within a component that has access to MediaDrop instance and files):
// 
// const { getAcceptedFiles, uploadFile } = useMediaDrop();
// 
// useEffect(() => {
//   getAcceptedFiles().forEach(file => {
//     if (!file.uploadStatus) {
//       uploadFile(file.id);
//     }
//   });
// }, [getAcceptedFiles, uploadFile]);

```

--------------------------------

### Install react-mediadrop

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/getting-started/installation.mdx

Install the react-mediadrop package using npm. This library requires React 18 or later. For Next.js App Router projects, ensure 'use client' is added to the top of files using useMediaDrop.

```bash
npm install react-mediadrop
```

--------------------------------

### React Media Drop - File Dialog Example

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(basics)/file-dialog.mdx

Use this example to integrate the file dialog opening functionality with your own custom button. Ensure `noClick` and `noKeyboard` are set to `true` on the dropzone component to disable its default behaviors. The `open()` method must be called directly from a user interaction, such as a click event handler, to comply with browser security policies.

```tsx
import { MediaDrop } from "react-mediadrop";

function FileDialogExample() {
  const [files, setFiles] = React.useState<File[]>([]);

  return (
    <MediaDrop
      files={files}
      setFiles={setFiles}
      noClick
      noKeyboard
      open={({ open }) => (
        <button onClick={open} type="button">
          Open file picker
        </button>
      )}
    />
  );
}
```

--------------------------------

### React Media Drop Cancel and Retry Example

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(uploads)/cancel-retry.mdx

Demonstrates the functionality of canceling an in-flight upload and retrying a failed upload. This example is simulated for demonstration purposes.

```tsx
import { useState, useCallback } from "react";
import {
  MediaDropzone,
  useUploadThing,
  FileRouter,
} from "@uploadthing/react";

import type { OurFileRouter } from "../pages/api/uploadthing";

const maxFileCount = 3;

function CancelRetryExample() {
  const [uploadProgress, setUploadProgress] = useState<{
    [key: string]: number;
  }>({});
  const [uploadStatus, setUploadStatus] = useState<{
    [key: string]: "uploading" | "success" | "error" | "canceled";
  }>({});

  const { startUpload, cancelUpload, retryUpload } = useUploadThing<OurFileRouter>(
    "fileRouter",
    {
      onUploadProgress: (p) => {
        setUploadProgress((prev) => ({ ...prev, [p.file.name]: p.progress }));
      },
      onUploadError: (error) => {
        console.error("Upload error:", error);
        setUploadStatus((prev) => ({ ...prev, [error.file.name]: "error" }));
      },
      onClientUploadComplete: (res) => {
        console.log("Uploads finished:", res);
        res.forEach((file) => {
          setUploadStatus((prev) => ({ ...prev, [file.name]: "success" }));
        });
      },
      onUploadBegin: (files) => {
        files.forEach((file) => {
          setUploadStatus((prev) => ({ ...prev, [file.name]: "uploading" }));
        });
      },
      onUploadCancel: (data) => {
        setUploadStatus((prev) => ({ ...prev, [data.file.name]: "canceled" }));
      },
    }
  );

  const handleCancel = useCallback(
    (file: File) => {
      cancelUpload(file.name);
    },
    [cancelUpload]
  );

  const handleRetry = useCallback(
    (file: File) => {
      retryUpload(file.name);
    },
    [retryUpload]
  );

  return (
    <>
      <div className="flex flex-col gap-4">
        <MediaDropzone
          maxFileCount={maxFileCount}
          className="h-[300px]"
          onDrop={(files) => {
            startUpload(files, {
              onClientUploadComplete: (res) => {
                console.log("Uploads finished:", res);
                res.forEach((file) => {
                  setUploadStatus((prev) => ({ ...prev, [file.name]: "success" }));
                });
              },
              onUploadError: (error) => {
                console.error("Upload error:", error);
                setUploadStatus((prev) => ({ ...prev, [error.file.name]: "error" }));
              },
            });
          }}
        />
        <div className="flex flex-col gap-2">
          {Object.keys(uploadStatus).map((fileName) => (
            <div key={fileName} className="flex items-center gap-2">
              <span>{fileName}</span>
              {uploadStatus[fileName] === "uploading" && (
                <progress max={100} value={uploadProgress[fileName] ?? 0}></progress>
              )}
              {uploadStatus[fileName] === "error" && (
                <button onClick={() => handleRetry({ name: fileName } as File)}>
                  Retry
                </button>
              )}
              {uploadStatus[fileName] === "uploading" && (
                <button onClick={() => handleCancel({ name: fileName } as File)}>
                  Cancel
                </button>
              )}
              {uploadStatus[fileName] === "success" && <span>✅</span>}
              {uploadStatus[fileName] === "canceled" && <span>❌</span>}
            </div>
          ))}
        </div>
      </div>
    </>
  );
}

export default CancelRetryExample;

// Dummy FileRouter for the example
// In a real app, this would be in your api/uploadthing/[router].ts file

const dummyFileRouter = {
  fileRouter: {
    upload: {
      middleware: () => {
        // Simulate a 4-second upload time
        return new Promise((resolve) => setTimeout(() => resolve({}), 4000));
      },
      callback: () => {
        // Simulate a 10% chance of error
        if (Math.random() < 0.1) {
          throw new Error("Simulated upload error");
        }
        return {
          uploadUrl: "http://localhost:3000/upload",
        };
      },
      options: {
        maxFileCount: 3,
      },
    },
  },
} satisfies FileRouter;

export type OurFileRouter = typeof dummyFileRouter;

```

--------------------------------

### react-mediadrop Form Integration Example

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(basics)/forms.mdx

This example demonstrates how to mirror accepted files into a hidden input for native form submission. It utilizes the `.file` property of `MediaDropFile` to access the original browser File object.

```tsx
import * as React from 'react';
import { MediaDrop } from 'react-mediadrop';

const FormsExample = () => {
  const [files, setFiles] = React.useState<MediaDropFile[]>([]);

  const handleDrop = React.useCallback((acceptedFiles: MediaDropFile[]) => {
    setFiles(acceptedFiles);
  }, []);

  return (
    <form method="post" action="/submit-files">
      <MediaDrop onDrop={handleDrop} />
      <input
        type="hidden"
        name="media"
        value={JSON.stringify(files.map(f => f.file))}
      />
      <button type="submit">Submit</button>
    </form>
  );
};

export default FormsExample;

```

--------------------------------

### React Presigned URL Upload Example

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(uploads)/presigned-url.mdx

This example demonstrates how to upload files directly to a presigned PUT URL using react-mediadrop. It requires resolving the presigned URL for each file before initiating the upload.

```tsx
import { createXhrUploadTransport } from "@medialib/react-mediadrop";
import { useState } from "react";

const PresignedUploadExample = () => {
  const [files, setFiles] = useState<File[]>([]);

  const handleFilesChange = (newFiles: File[]) => {
    setFiles(newFiles);
  };

  const handleUpload = async () => {
    if (files.length === 0) return;

    const transport = createXhrUploadTransport({
      endpoint: async (file) => {
        // Replace with your actual server endpoint to get a presigned URL
        const response = await fetch("/api/presigned-url", {
          method: "POST",
          headers: {
            "Content-Type": "application/json",
          },
          body: JSON.stringify({
            filename: file.name,
            contentType: file.type,
          }),
        });
        const { url } = await response.json();
        return url;
      },
      formData: false, // Send raw bytes as the request body
    });

    for (const file of files) {
      try {
        await transport.uploadFile(file);
        console.log(`Successfully uploaded ${file.name}`);
      } catch (error) {
        console.error(`Failed to upload ${file.name}:`, error);
      }
    }
  };

  return (
    <div>
      <input type="file" multiple onChange={(e) => handleFilesChange(Array.from(e.target.files || []))}/>
      <button onClick={handleUpload} disabled={files.length === 0}>Upload</button>
    </div>
  );
};

export default PresignedUploadExample;
```

--------------------------------

### Root and Input Props Example

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/use-media-drop.mdx

Demonstrates how to use getRootProps and getInputProps to attach drag-and-drop and input handlers to your JSX elements. Includes aria-label and className for accessibility and styling.

```tsx
<div
	{...getRootProps({
		"aria-label": "File upload dropzone",
		className: "dropzone",
	})}
>
	<input {...getInputProps({ "aria-hidden": "true" })} />
</div>
```

--------------------------------

### Example Custom Validator

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/guides/validation.mdx

An example of a custom validator that rejects files with spaces in their names. Use custom validators for rules not covered by standard restrictions.

```typescript
function validator(file: File) {
	if (file.name.includes(" ")) {
		return { code: "validator-error", message: "Filenames can't contain spaces" };
	}
	return null;
}
```

--------------------------------

### React Media Drop Minimal Setup

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(basics)/basic.mdx

This snippet shows the basic configuration for React Media Drop, including file intake and drag state management. It omits validation and upload transport for simplicity.

```tsx
import * as React from 'react';
import { MediaDrop } from '@react-mediadrop/react-mediadrop';

const BasicExample = () => (
  <MediaDrop
    onFilesDrop={(_files, _event) => {
      console.log('Files dropped!');
    }}
    onDragEnter={() => {
      console.log('Drag entered!');
    }}
    onDragLeave={() => {
      console.log('Drag left!');
    }}
  />
);

export default BasicExample;
```

--------------------------------

### React Media Drop Concurrency Example

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(uploads)/concurrency.mdx

Demonstrates setting the concurrency limit for uploads in React Media Drop. Files exceeding the cap will have an upload status of 'queued'.

```tsx
import React, { useState, useCallback } from "react";
import { useMediaDrop } from "react-media-drop";

const MAX_CONCURRENT_UPLOADS = 2;

function ConcurrencyExample() {
  const [files, setFiles] = useState([]);

  const handleFileDrop = useCallback((acceptedFiles) => {
    setFiles((prevFiles) => [
      ...prevFiles,
      ...acceptedFiles.map((file) => ({
        file,
        uploadStatus: "pending", // Initial status
      })),
    ]);
  }, []);

  const { getRootProps, getInputProps, isDragActive } = useMediaDrop({
    onDrop: handleFileDrop,
    concurrency: MAX_CONCURRENT_UPLOADS,
  });

  // Simulate upload progress and status updates
  React.useEffect(() => {
    const uploadingFiles = files.filter((f) => f.uploadStatus === "uploading");
    const queuedFiles = files.filter((f) => f.uploadStatus === "queued");

    if (uploadingFiles.length < MAX_CONCURRENT_UPLOADS && queuedFiles.length > 0) {
      setFiles((prevFiles) => {
        const nextFiles = [...prevFiles];
        let uploadedCount = 0;
        for (let i = 0; i < nextFiles.length && uploadedCount < MAX_CONCURRENT_UPLOADS - uploadingFiles.length; i++) {
          if (nextFiles[i].uploadStatus === "queued") {
            nextFiles[i].uploadStatus = "uploading";
            uploadedCount++;
          }
        }
        return nextFiles;
      });
    }

    files.forEach((file, index) => {
      if (file.uploadStatus === "uploading") {
        // Simulate upload
        setTimeout(() => {
          setFiles((prevFiles) => {
            const updatedFiles = [...prevFiles];
            updatedFiles[index].uploadStatus = "success"; // or "error"
            return updatedFiles;
          });
        }, Math.random() * 3000 + 1000); // Simulate upload time
      }
    });
  }, [files]);

  return (
    <div {...getRootProps()} style={{ border: "2px dashed grey", padding: "20px", textAlign: "center" }}>
      <input {...getInputProps()} />
      {isDragActive ? (
        <p>Drop the files here ...</p>
      ) : (
        <p>Drag 'n' drop some files here, or click to select files</p>
      )}
      <ul>
        {files.map((file, index) => (
          <li key={index}>
            {file.file.name} - Status: {file.uploadStatus}
          </li>
        ))}
      </ul>
    </div>
  );
}

export default ConcurrencyExample;

```

--------------------------------

### Install Agent Skill

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/getting-started/agent-skill.mdx

Use this command to add the react-mediadrop Agent Skill to your project. This allows AI coding agents to automatically pick up the skill.

```sh
npx skills add autorender/react-mediadrop
```

--------------------------------

### Install React MediaDrop Dropzone Block

Source: https://github.com/autorender/react-mediadrop/blob/main/README.md

Use the shadcn CLI to add the react-mediadrop dropzone block directly into your project. You can swap 'dropzone' for other available blocks like 'avatar-uploader', 'multi-file-upload-form', or 's3-direct-upload'.

```sh
npx shadcn@latest add autorender/react-mediadrop/dropzone
```

--------------------------------

### react-mediadrop — Accepting File Types

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(basics)/accept.mdx

This example demonstrates how to restrict the dropzone to accept specific file types using the `restrictions.accept` property. It accepts MIME types, wildcards, or file extensions.

```tsx
import { MediaDropzone } from "react-mediadrop";

function AcceptExample() {
  return (
    <MediaDropzone
      accept={{
        "image/png": [],
        "image/jpeg": [],
        "image/gif": [],
        "image/*": [],
        ".pdf": [],
      }}
      onDropAccepted={(files) => console.log(files)}
    />
  );
}

```

--------------------------------

### Handling MediaDrop Errors

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(basics)/error-codes.mdx

This example demonstrates how to use the useMediaDrop hook to handle various file restrictions and custom validation errors. It iterates through files and their associated errors, logging the error code and message. It also shows how to handle upload-specific errors.

```tsx
import { useMediaDrop } from "react-mediadrop";

const { files } = useMediaDrop({
  restrictions: { accept: "image/*", minSize: 1024, maxSize: 2_000_000, maxFiles: 3 },
  validator: (file) =>
    file.name.includes(" ")
      ? { code: "validator-error", message: "Filenames can't contain spaces" }
      : null,
  transport, // rejects to produce uploadError: { code: "upload-error", ... }
});

for (const file of files) {
  for (const error of file.errors) {
    console.log(error.code, error.message);
  }
  if (file.uploadError) {
    console.log(file.uploadError.code, file.uploadError.message);
  }
}
```

--------------------------------

### Custom Validator Example

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(basics)/validator.mdx

Demonstrates how to implement a custom validator function for react-mediadrop. Return null/undefined to accept files, or an error/array of errors to reject them. Avoid reimplementing basic restrictions like accept, maxSize, or minSize within this function.

```tsx
import { MediaDrop } from "react-mediadrop";

function App() {
  const validator = (file: File) => {
    // Return null/undefined to accept
    // Return one error or an array of errors to reject
    if (file.size > 1000000) {
      return "File is too large";
    }
    if (!file.type.startsWith("image/")) {
      return "Only images are allowed";
    }
  };

  return (
    <MediaDrop
      validator={validator}
      // ... other props
    />
  );
}

export default App;
```

--------------------------------

### Click-to-open and Keyboard Activation

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/use-media-drop.mdx

By default, the root element is configured to be activatable via click and keyboard events, which triggers the native file picker. This behavior can be customized using the `noClick` and `noKeyboard` options.

```APIDOC
## Click-to-open and Keyboard Activation

### Description
By default, interacting with the root element (clicking or pressing Space/Enter when focused) will open the native file picker. This behavior can be modified using specific options.

### Options
- **`noClick: true`**: Disables the click-to-open functionality. The `open()` function can still be used programmatically, for example, from a separate "Choose files" button.
- **`noKeyboard: true`**: Disables opening the file picker via Space/Enter key presses when the root element is focused. It also removes the `tabIndex` from the returned props and stops tracking the `isFocused` state.
- **`noDrag: true`**: Disables drag and drop handling on the root element. Click-to-open and keyboard activation remain functional.

### Overriding Default Behavior
If you render custom elements within the root, such as a "Choose files" button, ensure that their click events do not bubble up to the root element to prevent the file picker from opening twice. You can achieve this by calling `event.stopPropagation()` in your custom click handler.

### Example with Custom Button
```tsx
<div {...getRootProps()}>
	<input {...getInputProps()} />
	<button
		type="button"
		onClick={(event) => {
			event.stopPropagation();
			open();
		}}
	>
		Choose files
	</button>
</div>
```
```

--------------------------------

### Custom Choose Files Button

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/use-media-drop.mdx

Illustrates creating a custom button to trigger the file picker programmatically using the open() function. It's crucial to stop event propagation to prevent the default click-to-open behavior from firing twice.

```tsx
<div {...getRootProps()}>
	<input {...getInputProps()} />
	<button
		type="button"
		onClick={(event) => {
			event.stopPropagation();
			open();
		}}
	>
		Choose files
	</button>
</div>
```

--------------------------------

### getRootProps and getInputProps Usage

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/use-media-drop.mdx

These functions return props that should be spread onto the root element and the hidden file input, respectively. They handle event listeners for drag-and-drop, click, and keyboard interactions, and can accept arbitrary HTML attributes for further customization.

```APIDOC
## getRootProps and getInputProps

### Description
These functions provide essential props for integrating the hook's functionality with your JSX. `getRootProps` should be applied to the main dropzone container, and `getInputProps` to the hidden file input element.

### Usage
Both functions accept an optional argument object where you can pass additional HTML attributes. These attributes are merged with the hook's generated props. For `getInputProps`, any `style` prop is merged, but `display: none` is enforced by the hook.

### Example
```tsx
<div
	{...getRootProps({
		"aria-label": "File upload dropzone",
		className: "dropzone",
	})}
>
	<input {...getInputProps({ "aria-hidden": "true" })}
/>
</div>
```

### Composing Handlers
Custom event handlers can be composed with the hook's handlers. Your custom handler will execute first. If your handler calls `event.stopPropagation()`, the hook's default handling for that event will be skipped.

### Example of Composing Handlers
```tsx
<div {...getRootProps({ onDrop: (e) => console.log("also dropped", e) })}>
```
```

--------------------------------

### Session Store Creation and File Fingerprinting

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/guides/upload.mdx

Provides utility functions for creating in-memory or browser-backed upload session stores and for generating file fingerprints based on metadata.

```typescript
createMemoryUploadSessionStore(); // in-process only — gone on reload, gone between tabs
createBrowserUploadSessionStore({ prefix? }); // localStorage-backed, SSR-safe (no-op without `window`)

createFileFingerprint(file: File): string; // name+size+type+lastModified+webkitRelativePath, not file contents
```

--------------------------------

### Import useMediaDrop Hook

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/use-media-drop.mdx

Import the useMediaDrop hook from the react-mediadrop library.

```typescript
import { useMediaDrop } from "react-mediadrop";
```

--------------------------------

### Import necessary hooks and transport

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/getting-started/installation.mdx

Import the useMediaDrop hook and the createXhrUploadTransport function from the react-mediadrop library. Remember to add 'use client' at the top of your file if using Next.js App Router.

```javascript
import { useMediaDrop } from "react-mediadrop";
import { createXhrUploadTransport } from "react-mediadrop/xhr-upload";
```

--------------------------------

### Composing Custom Drop Handlers

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/use-media-drop.mdx

Shows how to compose custom event handlers with the hook's default handlers. Custom handlers execute before the hook's handlers.

```tsx
<div {...getRootProps({ onDrop: (e) => console.log("also dropped", e) })}>
```

--------------------------------

### createBrowserUploadSessionStore Function

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/types.mdx

Creates a browser-based implementation of the MediaDropUploadSessionStore, typically using localStorage or sessionStorage.

```APIDOC
## createBrowserUploadSessionStore Function

### Description
Creates a browser-based implementation of the MediaDropUploadSessionStore, typically using localStorage or sessionStorage.

### Function Signature
```typescript
function createBrowserUploadSessionStore(options?: { prefix?: string }): MediaDropUploadSessionStore;
```
```

--------------------------------

### Import createXhrUploadTransport

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/xhr-upload.mdx

Import the necessary function from the react-mediadrop/xhr-upload package.

```typescript
import { createXhrUploadTransport } from "react-mediadrop/xhr-upload";
```

--------------------------------

### createMemoryUploadSessionStore Function

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/types.mdx

Creates an in-memory implementation of the MediaDropUploadSessionStore.

```APIDOC
## createMemoryUploadSessionStore Function

### Description
Creates an in-memory implementation of the MediaDropUploadSessionStore.

### Function Signature
```typescript
function createMemoryUploadSessionStore(): MediaDropUploadSessionStore;
```
```

--------------------------------

### React MediaDrop Hook Initialization

Source: https://github.com/autorender/react-mediadrop/blob/main/README.md

Initialize the useMediaDrop hook in a React component. Configure restrictions for accepted file types and maximum number of files.

```tsx
import { useMediaDrop } from "react-mediadrop";

const { getRootProps, getInputProps, files } = useMediaDrop({
	restrictions: { accept: ["image/png", "image/jpeg"], maxFiles: 5 },
});
```

--------------------------------

### MediaDropUploadSessionStore Interface and Factory Functions

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/types.mdx

Defines the interface for managing upload session data and provides factory functions for creating memory-based and browser-based session stores.

```typescript
type MediaDropUploadSessionStore = {
	get(key: string): Promise<unknown | null>;
	set(key: string, value: unknown): Promise<void>;
	remove(key: string): Promise<void>;
};

function createMemoryUploadSessionStore(): MediaDropUploadSessionStore;
function createBrowserUploadSessionStore(options?: {
	prefix?: string;
}): MediaDropUploadSessionStore;

function createFileFingerprint(file: File): string;
```

--------------------------------

### Configure Upload Behavior

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/guides/upload.mdx

Set the maximum number of concurrent uploads, the number of retries for failed uploads, and the grace period for cancellation.

```typescript
useMediaDrop({
	transport,
	concurrency: 3, // max uploads in flight at once. Default 1 (sequential).
	retries: 2, // retries *after* the first attempt, shared for every file. Default 0.
	retryDelays: [1000, 2000, 4000], // backoff per retry; last value repeats if exhausted.
	cancelGraceMs: 5000, // force-free a slot this long after cancel if the transport never settles. Default 5000.
});
```

--------------------------------

### Minimal Fetch-based Upload Transport

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/guides/custom-transport.mdx

A basic implementation of a custom upload transport using the Fetch API. It sends the file via POST and reports progress only upon completion due to Fetch's lack of built-in upload progress events.

```typescript
import { createHttpError, type UploadTransport } from "react-mediadrop";

function createMyTransport(options: { endpoint: string }): UploadTransport {
	return {
		aSync upload(file, { onProgress, signal }) {
			const response = await fetch(options.endpoint, {
				method: "POST",
				body: file.file,
				signal,
			});

			if (!response.ok) {
				throw createHttpError(`Upload failed: ${response.status}`, response.status);
			}

			onProgress({ loaded: file.size, total: file.size });
			return { response: await response.json() };
		},
	};
}
```

--------------------------------

### Create XHR Upload Transport

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/xhr-upload.mdx

Instantiate the transport with an endpoint and optional fields. This transport is used with the useMediaDrop hook for managing uploads.

```typescript
import { useMediaDrop } from "react-mediadrop";
import { createXhrUploadTransport } from "react-mediadrop/xhr-upload";

const transport = createXhrUploadTransport({
	endpoint: "/api/upload", // or (file) => `/api/upload/${file.id}` for a per-file URL
	fields: { folder: "avatars" }, // extra multipart fields
});

const { files } = useMediaDrop({ transport, concurrency: 3, retries: 2 });
```

--------------------------------

### RetryOptions and withRetry Function

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/types.mdx

Defines options for configuring retry logic and the `withRetry` utility function for handling asynchronous operations with retries.

```typescript
type RetryOptions = {
	retries?: number;
	retryDelays?: number[];
	shouldRetry?: (error: unknown, attemptNumber: number) => boolean;
	jitter?: number; // 0–1
};

function withRetry<T>( 
	attempt: (attemptNumber: number) => Promise<T>,
	options: RetryOptions,
	signal: AbortSignal,
): Promise<T>;
```

--------------------------------

### Add "use client" Directive for React MediaDrop

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/getting-started/installation.mdx

When using `useMediaDrop` in a Next.js project with React Server Components, you must add the 'use client' directive at the top of your file. This ensures that the component runs in a Client Component environment, as `useMediaDrop` relies on hooks like `useState` and `useEffect` which are not available in Server Components.

```tsx
"use client";

import { useMediaDrop } from "react-mediadrop";
```

--------------------------------

### createFileFingerprint Function

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/types.mdx

Generates a unique fingerprint for a given File object, useful for identifying upload sessions.

```APIDOC
## createFileFingerprint Function

### Description
Generates a unique fingerprint for a given File object, useful for identifying upload sessions.

### Function Signature
```typescript
function createFileFingerprint(file: File): string;
```
```

--------------------------------

### useMediaDrop Hook

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/use-media-drop.mdx

The useMediaDrop hook is a headless function that manages file drop and upload interactions. It accepts an options object to configure its behavior and returns a set of properties and methods for interacting with the file input and dropzone.

```APIDOC
## useMediaDrop Hook

### Description
Provides headless functionality for file drops and uploads. Users own the markup and control the UI.

### Signature
```ts
function useMediaDrop(options?: {
	restrictions?: MediaDropRestrictions;
	validator?: MediaDropValidator;
	noClick?: boolean; // disable click-to-open on the root
	noKeyboard?: boolean; // disable Space/Enter-to-open and focus tracking
	noDrag?: boolean; // disable the root's drag/drop handling
	transport?: UploadTransport; // opt into upload — see below
	concurrency?: number; // max uploads in flight at once. Default 1.
	retries?: number; // retries after the first attempt. Default 0.
	retryDelays?: number[]; // backoff per retry.
	cancelGraceMs?: number; // force-free a slot after cancel. Default 5000.
}): UseMediaDropResult;
```

### Options
- **`restrictions`**: Configuration for file type and size restrictions.
- **`validator`**: A custom function for validating files.
- **`noClick`** (boolean): If true, disables click-to-open functionality on the root element.
- **`noKeyboard`** (boolean): If true, disables keyboard activation (Space/Enter) and focus tracking.
- **`noDrag`** (boolean): If true, disables drag and drop handling on the root element.
- **`transport`** (UploadTransport): Enables upload functionality. See the Upload guide for details.
- **`concurrency`** (number): Maximum number of concurrent uploads. Defaults to 1.
- **`retries`** (number): Number of retries for failed uploads. Defaults to 0.
- **`retryDelays`** (number[]): Array of delays for upload retries.
- **`cancelGraceMs`** (number): Time in milliseconds to force-free a slot after a cancel. Defaults to 5000.

### Return Value (`UseMediaDropResult`)
- **`files` / `acceptedFiles` / `rejectedFiles`** (`MediaDropFile[]`): An array of files, filtered by their status.
- **`isDragActive` / `isDragAccept` / `isDragReject`** (`boolean`): State indicating the drag-and-drop status of the dropzone.
- **`isFocused`** (`boolean`): Indicates if the root element has keyboard focus. Always `false` when `noKeyboard` is set.
- **`isDragGlobal`** (`boolean`): Indicates if a file drag is happening anywhere on the document.
- **`removeFile(id)` / `clearFiles()`** (`() => void`): Functions to remove individual files by ID or clear all files. Cancels in-flight uploads for removed files.
- **`open()`** (`() => void`): Imperatively opens the native file picker dialog.
- **`getRootProps(arg?)`** (`() => RootProps`): Returns props to be spread onto the root element, including drag/drop, click/keyboard handlers, `role`, and `tabIndex`.
- **`getInputProps(arg?)`** (`() => InputProps`): Returns props for the hidden file input element.

*Note: If `transport` is provided, additional upload-related methods like `uploadFile`, `uploadAll`, `cancelUpload`, `cancelAllUploads`, and `retryUpload` are also returned.*
```

--------------------------------

### withRetry Function

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/types.mdx

A utility function that wraps an asynchronous operation with retry logic based on the provided options.

```APIDOC
## withRetry Function

### Description
A utility function that wraps an asynchronous operation with retry logic based on the provided options.

### Function Signature
```typescript
function withRetry<T>(
	attempt: (attemptNumber: number) => Promise<T>,
	options: RetryOptions,
	signal: AbortSignal,
): Promise<T>;
```
```

--------------------------------

### RetryOptions Type

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/types.mdx

Configuration options for retrying operations, including the number of retries, delay intervals, and custom retry logic.

```APIDOC
## RetryOptions Type

### Description
Configuration options for retrying operations, including the number of retries, delay intervals, and custom retry logic.

### Type Definition
```typescript
type RetryOptions = {
	retries?: number;
	retryDelays?: number[];
	shouldRetry?: (error: unknown, attemptNumber: number) => boolean;
	jitter?: number; // 0–1
};
```
```

--------------------------------

### React MediaDrop with XHR Upload Transport

Source: https://github.com/autorender/react-mediadrop/blob/main/README.md

Configure useMediaDrop with an XHR upload transport for handling file uploads. Specify the endpoint, concurrency, and retries.

```ts
import { useMediaDrop } from "react-mediadrop";
import { createXhrUploadTransport } from "react-mediadrop/xhr-upload";

const { files, uploadAll } = useMediaDrop({
	transport: createXhrUploadTransport({ endpoint: "/api/upload" }),
	concurrency: 3,
	retries: 2,
});
```

--------------------------------

### createXhrUploadTransport

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/xhr-upload.mdx

Creates an upload transport that sends files using XMLHttpRequest. This is useful for applications that need to display upload progress, as XMLHttpRequest provides a reliable `onprogress` event across browsers, unlike the Fetch API.

```APIDOC
## createXhrUploadTransport

### Description
Creates an upload transport that sends files using `XMLHttpRequest`. This is useful for applications that need to display upload progress, as `XMLHttpRequest` provides a reliable `onprogress` event across browsers, unlike the Fetch API.

### Method Signature
`createXhrUploadTransport(options: XhrUploadTransportOptions): UploadTransport`

### Options

| Option | Type | Default | Notes |
| --- | --- | --- | --- |
| `endpoint` | `string | (file) => string` | — required | Computed per file, e.g. for a per-file presigned URL you already fetched. |
| `method` | `string` | `"POST"` | |
| `fieldName` | `string` | `"file"` | Ignored when `formData: false`. |
| `fields` | `object | (file) => object` | — | Extra multipart fields. Ignored when `formData: false`. |
| `headers` | `object | (file) => object` | — | |
| `withCredentials` | `boolean` | `false` | |
| `formData` | `boolean` | `true` | `false` sends the raw file body. |
| `isSuccessStatus` | `(status) => boolean` | `200–299` | |
| `stallTimeoutMs` | `number` | `0` (disabled) | Abort and reject if no upload progress happens for this long — a *stall* timeout (reset on every progress tick), not a flat total-duration one, so a large file on a slow-but-healthy connection is never falsely aborted. |

### Usage Example

```ts
import { useMediaDrop } from "react-mediadrop";
import { createXhrUploadTransport } from "react-mediadrop/xhr-upload";

const transport = createXhrUploadTransport({
	endpoint: "/api/upload", // or (file) => `/api/upload/${file.id}` for a per-file URL
	fields: { folder: "avatars" }, // extra multipart fields
});

const { files } = useMediaDrop({ transport, concurrency: 3, retries: 2 });
```

### Notes
- This transport is intended for generic REST-ish endpoints that you control.
- It defaults to `multipart/form-data` but can send the raw file bytes if `formData: false`.
- It does not include retry logic or concurrency control; these are handled by the queue (e.g., `useMediaDrop`).
- It does not have a flat request timeout, only a `stallTimeoutMs` to detect lack of progress.
- Uploads are not resumable; failed or canceled uploads restart from the beginning.
```

--------------------------------

### Accessing MediaDrop Engine State

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/guides/core-concepts.mdx

Retrieve the current state of the media drop engine, which includes an array of files. This is useful for external state management or debugging.

```typescript
engine.getState(); // { files: MediaDropFile[] }
```

```typescript
engine.subscribe(listener); // full-state subscription
```

```typescript
engine.subscribe(selector, listener); // fires only when selector's result changes
```

--------------------------------

### MediaDropUploadSessionStore Interface

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/guides/upload.mdx

Defines the interface for storing upload session metadata, such as upload IDs and byte offsets, for resumable transports.

```typescript
type MediaDropUploadSessionStore = {
	get(key: string): Promise<unknown | null>;
	set(key: string, value: unknown): Promise<void>;
	remove(key: string): Promise<void>;
};
```

--------------------------------

### MediaDropRestrictions Type

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/types.mdx

Defines the constraints that can be applied to files during the drop process, such as size limits and accepted file types.

```APIDOC
## MediaDropRestrictions Type

### Description
Defines the constraints that can be applied to files during the drop process, such as size limits and accepted file types.

### Type Definition
```typescript
type MediaDropRestrictions = {
	maxFiles?: number;
	minSize?: number; // bytes
	maxSize?: number; // bytes
	accept?: string[] | string; // mime types, wildcards, or extensions
};
```
```

--------------------------------

### MediaDropUploadSessionStore Type

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/types.mdx

An interface for storing and retrieving upload session data, used for implementing custom resumable transports.

```APIDOC
## MediaDropUploadSessionStore Type

### Description
An interface for storing and retrieving upload session data, used for implementing custom resumable transports.

### Type Definition
```typescript
type MediaDropUploadSessionStore = {
	get(key: string): Promise<unknown | null>;
	set(key: string, value: unknown): Promise<void>;
	remove(key: string): Promise<void>;
};
```
```

--------------------------------

### Retry Options Type Definition

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/guides/upload.mdx

Defines the configuration options for the retry engine, including the number of retries, delay strategy, custom retry conditions, and jitter for spreading retries.

```typescript
type RetryOptions = {
	retries?: number; // retries after the first attempt. Default 0.
	retryDelays?: number[]; // backoff per retry; last value repeats if exhausted.
	shouldRetry?: (error: unknown, attemptNumber: number) => boolean; // default: defaultShouldRetry
	jitter?: number; // 0–1, randomizes each delay by up to this fraction. Default 0.
};
```

--------------------------------

### Set Max Files in React MediaDrop

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/examples/(basics)/max-files.mdx

Use the `restrictions.maxFiles` option to cap the number of files a dropzone accepts. This limit is evaluated against the entire file list, not per individual upload batch.

```tsx
import { MediaDropzone } from 'react-mediadrop';

function MyDropzone() {
  return (
    <MediaDropzone
      // ... other props
      restrictions={{
        maxFiles: 5,
      }}
    />
  );
}
```

--------------------------------

### MediaDropFile Type

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/types.mdx

Defines the structure of a file object managed by react-mediadrop, including its metadata, status, and upload-related fields.

```typescript
type MediaDropFile = {
	id: string;
	file: File;
	name: string;
	size: number;
	type: string;
	lastModified?: number;
	status: "idle" | "accepted" | "rejected";
	errors: MediaDropError[];

	// Upload fields, only set once an upload is requested:
	uploadStatus?: "queued" | "uploading" | "done" | "error" | "canceled";
	progress?: { loaded: number; total: number | null };
	uploadError?: MediaDropError;
	uploadResult?: unknown;
	uploadAttempts?: number;
};
```

--------------------------------

### Understanding Drag State in React Media Drop

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/guides/core-concepts.mdx

Examine the different states of a drag operation within the dropzone. `isDragActive` indicates an active drag, `isDragAccept` suggests the payload is acceptable, and `isDragReject` indicates it is not. Note that `isDragAccept` and `isDragReject` rely on MIME types for accurate mid-drag evaluation.

```typescript
type DragState = {
	isDragActive: boolean; // a drag payload is over this dropzone right now
	isDragAccept: boolean; // best-effort: payload looks acceptable
	isDragReject: boolean; // best-effort: payload looks unacceptable
};

```

--------------------------------

### useMediaDrop Hook Signature

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/api-reference/use-media-drop.mdx

Defines the signature of the useMediaDrop hook, including its optional configuration options for restrictions, validation, interaction control, and upload transport.

```typescript
function useMediaDrop(options?: {
	restrictions?: MediaDropRestrictions;
	validator?: MediaDropValidator;
	noClick?: boolean; // disable click-to-open on the root
	noKeyboard?: boolean; // disable Space/Enter-to-open and focus tracking
	noDrag?: boolean; // disable the root's drag/drop handling
	transport?: UploadTransport; // opt into upload — see below
	concurrency?: number; // max uploads in flight at once. Default 1.
	retries?: number; // retries after the first attempt. Default 0.
	retryDelays?: number[]; // backoff per retry.
	cancelGraceMs?: number; // force-free a slot after cancel. Default 5000.
}): UseMediaDropResult;
```

--------------------------------

### MediaDropFile Upload Fields Type Definition

Source: https://github.com/autorender/react-mediadrop/blob/main/apps/docs/docs/guides/upload.mdx

Defines the structure for upload-related properties within a MediaDropFile object. Includes upload status, progress, error details, and result information.

```typescript
type MediaDropFile = {
	// ...status, errors, etc. — unchanged from Core...
	uploadStatus?: "queued" | "uploading" | "done" | "error" | "canceled";
	progress?: { loaded: number; total: number | null };
	uploadError?: MediaDropError; // code: "upload-error", present after a failed attempt
	uploadResult?: unknown; // whatever the transport resolved with — opaque to the engine
	uploadAttempts?: number; // 1-indexed, for the current/last upload run
};
```