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# no-deprecated-functions

[Added in v0.5.2](https://github.com/web-infra-dev/rslint/releases/tag/v0.5.2)
## Configuration

| Preset                           | Configured Value |
| -------------------------------- | ---------------- |
| ✅ jestPlugin.configs.all         | `"error"`        |
| ✅ jestPlugin.configs.recommended | `"error"`        |


```ts title=rslint.config.ts
import { defineConfig, jestPlugin } from '@rslint/core';

export default defineConfig([
  jestPlugin.configs.recommended,
  {
    rules: {
      'jest/no-deprecated-functions': 'error',
    },
  },
]);
```

## Rule Details

Jest sometimes deprecates globals and `jest` helpers in favor of newer APIs. This rule flags **calls** to those deprecated members and reports a replacement. A **fix** rewrites the callee to the suggested API; bracket-style access is preserved (for example `jest['genMockFromModule']` becomes `jest['createMockFromModule']`).

Which names are considered deprecated **depends on the Jest version** rslint uses for the file (from `settings.jest.version` or the resolved `package.json` dependency). A symbol is only reported once your configured major version is at least the version that deprecated it:

| Deprecated                 | Replacement                 | Starting at Jest major |
| -------------------------- | --------------------------- | ---------------------- |
| `jest.resetModuleRegistry` | `jest.resetModules`         | 15                     |
| `jest.addMatchers`         | `expect.extend`             | 17                     |
| `require.requireMock`      | `jest.requireMock`          | 21                     |
| `require.requireActual`    | `jest.requireActual`        | 21                     |
| `jest.runTimersToTime`     | `jest.advanceTimersByTime`  | 22                     |
| `jest.genMockFromModule`   | `jest.createMockFromModule` | 26                     |

If the resolved Jest version is too old for any of these deprecations, the rule does not report them.

Examples of **incorrect** code for this rule (assuming a Jest version where the corresponding API is deprecated):

```js
jest.resetModuleRegistry();
jest.addMatchers({});
require.requireMock('a');
require.requireActual('a');
jest.runTimersToTime(1000);
jest.genMockFromModule('m');
```

Examples of **correct** code for this rule:

```js
jest.resetModules();
expect.extend({});
jest.requireMock('a');
jest.requireActual('a');
jest.advanceTimersByTime(1000);
jest.createMockFromModule('m');
```

## Original Documentation

- [eslint-plugin-jest: no-deprecated-functions](https://github.com/jest-community/eslint-plugin-jest/blob/v29.16.0/docs/rules/no-deprecated-functions.md)
- [Source code](https://github.com/jest-community/eslint-plugin-jest/blob/v29.16.0/src/rules/no-deprecated-functions.ts)