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feat: add prefer-importing-jest-globals rule (#1490)
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* feat: prefer importing jest globals [new rule]

- Fix #1101

Issue: #1101

* test(prefer-importing-jest-globals): use `FlatCompatRuleTester`

* test(prefer-importing-jest-globals): clean up tests

* test(prefer-importing-jest-globals): explicitly set the source type to `script`

* fix(prefer-importing-jest-globals): remove unneeded properties from rule config

* fix(prefer-importing-jest-globals): support template literals

* refactor(prefer-importing-jest-globals): use accessor utilities and optional chaining

* refactor(prefer-importing-jest-globals): remove unneeded code

* refactor(prefer-importing-jest-globals): use a Set

---------

Co-authored-by: Gareth Jones <Jones258@Gmail.com>
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MadeinFrance and G-Rath committed Apr 6, 2024
1 parent 9aa7aee commit 37478d8
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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -328,6 +328,7 @@ set to warn in.\
| [prefer-expect-resolves](docs/rules/prefer-expect-resolves.md) | Prefer `await expect(...).resolves` over `expect(await ...)` syntax | | | 🔧 | |
| [prefer-hooks-in-order](docs/rules/prefer-hooks-in-order.md) | Prefer having hooks in a consistent order | | | | |
| [prefer-hooks-on-top](docs/rules/prefer-hooks-on-top.md) | Suggest having hooks before any test cases | | | | |
| [prefer-importing-jest-globals](docs/rules/prefer-importing-jest-globals.md) | Prefer importing Jest globals | | | 🔧 | |
| [prefer-lowercase-title](docs/rules/prefer-lowercase-title.md) | Enforce lowercase test names | | | 🔧 | |
| [prefer-mock-promise-shorthand](docs/rules/prefer-mock-promise-shorthand.md) | Prefer mock resolved/rejected shorthands for promises | | | 🔧 | |
| [prefer-snapshot-hint](docs/rules/prefer-snapshot-hint.md) | Prefer including a hint with external snapshots | | | | |
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47 changes: 47 additions & 0 deletions docs/rules/prefer-importing-jest-globals.md
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@@ -0,0 +1,47 @@
# Prefer importing Jest globals (`prefer-importing-jest-globals`)

🔧 This rule is automatically fixable by the
[`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).

<!-- end auto-generated rule header -->

This rule aims to enforce explicit imports from `@jest/globals`.

1. This is useful for ensuring that the Jest APIs are imported the same way in
the codebase.
2. When you can't modify Jest's
[`injectGlobals`](https://jestjs.io/docs/configuration#injectglobals-boolean)
configuration property, this rule can help to ensure that the Jest globals
are imported explicitly and facilitate a migration to `@jest/globals`.

## Rule details

Examples of **incorrect** code for this rule

```js
/* eslint jest/prefer-importing-jest-globals: "error" */

describe('foo', () => {
it('accepts this input', () => {
// ...
});
});
```

Examples of **correct** code for this rule

```js
/* eslint jest/prefer-importing-jest-globals: "error" */

import { describe, it } from '@jest/globals';

describe('foo', () => {
it('accepts this input', () => {
// ...
});
});
```

## Further Reading

- [Documentation](https://jestjs.io/docs/api)
2 changes: 2 additions & 0 deletions src/__tests__/__snapshots__/rules.test.ts.snap
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Expand Up @@ -45,6 +45,7 @@ exports[`rules should export configs that refer to actual rules 1`] = `
"jest/prefer-expect-resolves": "error",
"jest/prefer-hooks-in-order": "error",
"jest/prefer-hooks-on-top": "error",
"jest/prefer-importing-jest-globals": "error",
"jest/prefer-lowercase-title": "error",
"jest/prefer-mock-promise-shorthand": "error",
"jest/prefer-snapshot-hint": "error",
Expand Down Expand Up @@ -126,6 +127,7 @@ exports[`rules should export configs that refer to actual rules 1`] = `
"jest/prefer-expect-resolves": "error",
"jest/prefer-hooks-in-order": "error",
"jest/prefer-hooks-on-top": "error",
"jest/prefer-importing-jest-globals": "error",
"jest/prefer-lowercase-title": "error",
"jest/prefer-mock-promise-shorthand": "error",
"jest/prefer-snapshot-hint": "error",
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2 changes: 1 addition & 1 deletion src/__tests__/rules.test.ts
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Expand Up @@ -2,7 +2,7 @@ import { existsSync } from 'fs';
import { resolve } from 'path';
import plugin from '../';

const numberOfRules = 52;
const numberOfRules = 53;
const ruleNames = Object.keys(plugin.rules);
const deprecatedRules = Object.entries(plugin.rules)
.filter(([, rule]) => rule.meta.deprecated)
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