# `react-doctor/no-create-object-url-without-revoke`

createObjectURL without revokeObjectURL

- **Category:** Performance
- **Severity:** warn
- **Source:** oxlint-plugin-react-doctor
- **Framework:** global
- **Enabled when:** always

## Validate the diagnostic

Confirm the reported code matches this rule before you edit it.

Confirm the reported code matches `react-doctor/no-create-object-url-without-revoke`. Compare it with the Before example and verify the same API, framework, and execution context. Treat it as a false positive only when one of those conditions differs.

## Compare the code

The corrected pattern shows a focused way to address the diagnostic.

### Reported pattern

```ts
const download = (blob) => {
  link.href = URL.createObjectURL(blob);
  link.click();
};
```

### Corrected pattern

```ts
const download = (blob) => {
  const objectUrl = URL.createObjectURL(blob);
  try {
    link.href = objectUrl;
    link.click();
  } finally {
    URL.revokeObjectURL(objectUrl);
  }
};
```

## How to fix

Use the corrected pattern as a reference. Preserve behavior that the rule does not require you to change.

### Copyable fix prompt

Copy this self-contained prompt into your coding agent after you confirm the diagnostic.

````text
Fix every confirmed `react-doctor/no-create-object-url-without-revoke` diagnostic in the current repository.

Required change:
- Call `URL.revokeObjectURL(url)` once the object URL is no longer needed (after the download, in a `useEffect` cleanup, or on unmount). An object URL keeps its Blob/File alive for the document lifetime until it is revoked.

Reference transformation:

Before:
```ts
const download = (blob) => {
  link.href = URL.createObjectURL(blob);
  link.click();
};
```

After:
```ts
const download = (blob) => {
  const objectUrl = URL.createObjectURL(blob);
  try {
    link.href = objectUrl;
    link.click();
  } finally {
    URL.revokeObjectURL(objectUrl);
  }
};
```

Constraints:
- Confirm the reported code matches the Before pattern.
- Make the smallest change that fixes the root cause.
- Preserve behavior and interfaces unrelated to this diagnostic.
- Reuse existing project components, utilities, and conventions.
- Do not introduce render-phase side effects, render-phase state updates, or Hooks rule violations.
- Preserve resource ownership and cleanup. Do not move work into a hotter render or frame path.
- Adapt identifiers and framework details instead of copying blindly.
- Do not disable the rule or suppress matching code.

Verification:
- Run focused tests for the changed behavior.
- Run React Doctor and confirm this diagnostic no longer appears.
- Report the files changed and any checks you could not run.
````