# `react-doctor/context-provider-value-from-unmemoized-local-literal`

Context value from an unmemoized local literal

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

## Validate the diagnostic

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

Confirm the reported code matches `react-doctor/context-provider-value-from-unmemoized-local-literal`. 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

```tsx
import { createContext } from "react";
const ThemeContext = createContext(null);
const App = ({ theme }) => {
  const value = { theme };
  return <ThemeContext.Provider value={value}><Child /></ThemeContext.Provider>;
};
```

### Corrected pattern

```tsx
import { createContext, useMemo } from "react";
const ThemeContext = createContext(null);
const App = ({ theme }) => {
  const value = useMemo(() => ({ theme }), [theme]);
  return <ThemeContext.Provider value={value}><Child /></ThemeContext.Provider>;
};
```

## 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/context-provider-value-from-unmemoized-local-literal` diagnostic in the current repository.

Required change:
- Memoize the context value in component scope so consumers do not redraw every render. For mapped providers, extract each item into a child component and memoize there.

Reference transformation:

Before:
```tsx
import { createContext } from "react";
const ThemeContext = createContext(null);
const App = ({ theme }) => {
  const value = { theme };
  return <ThemeContext.Provider value={value}><Child /></ThemeContext.Provider>;
};
```

After:
```tsx
import { createContext, useMemo } from "react";
const ThemeContext = createContext(null);
const App = ({ theme }) => {
  const value = useMemo(() => ({ theme }), [theme]);
  return <ThemeContext.Provider value={value}><Child /></ThemeContext.Provider>;
};
```

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.
- Confirm this rule is enabled for the project: `react`.
- Do not edit code when this condition applies: react-compiler.

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.
````