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https://github.com/sindresorhus/eslint-plugin-unicorn
More than 100 powerful ESLint rules
https://github.com/sindresorhus/eslint-plugin-unicorn
eslint eslint-config eslint-plugin eslint-rules javascript linting-rules nodejs unicorns xo
Last synced: 5 days ago
JSON representation
More than 100 powerful ESLint rules
- Host: GitHub
- URL: https://github.com/sindresorhus/eslint-plugin-unicorn
- Owner: sindresorhus
- License: mit
- Created: 2016-04-09T07:48:04.000Z (almost 9 years ago)
- Default Branch: main
- Last Pushed: 2024-10-22T06:40:17.000Z (3 months ago)
- Last Synced: 2024-10-29T10:08:39.903Z (3 months ago)
- Topics: eslint, eslint-config, eslint-plugin, eslint-rules, javascript, linting-rules, nodejs, unicorns, xo
- Language: JavaScript
- Homepage:
- Size: 4.91 MB
- Stars: 4,257
- Watchers: 23
- Forks: 367
- Open Issues: 380
-
Metadata Files:
- Readme: readme.md
- Contributing: .github/contributing.md
- Funding: .github/funding.yml
- License: license
- Security: .github/security.md
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README
# eslint-plugin-unicorn [](https://codecov.io/gh/sindresorhus/eslint-plugin-unicorn/branch/main) [](https://npmjs.com/package/eslint-plugin-unicorn)
> More than 100 powerful ESLint rules
You might want to check out [XO](https://github.com/xojs/xo), which includes this plugin.
[**Propose or contribute a new rule ➡**](.github/contributing.md)
## Install
```sh
npm install --save-dev eslint eslint-plugin-unicorn
```
**Requires ESLint `>=9.18.0`, [flat config](https://eslint.org/docs/latest/use/configure/configuration-files), and [ESM](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c#how-can-i-make-my-typescript-project-output-esm).**
## Usage
Use a [preset config](#preset-configs) or configure each rule in `eslint.config.js`.
If you don't use the preset, ensure you use the same `languageOptions` config as below.
```js
import eslintPluginUnicorn from 'eslint-plugin-unicorn';
import globals from 'globals';
export default [
{
languageOptions: {
globals: globals.builtin,
},
plugins: {
unicorn: eslintPluginUnicorn,
},
rules: {
'unicorn/better-regex': 'error',
'unicorn/…': 'error',
},
},
// …
];
```
## Rules
💼 [Configurations](https://github.com/sindresorhus/eslint-plugin-unicorn#preset-configs-eslintconfigjs) enabled in.\
✅ Set in the `recommended` [configuration](https://github.com/sindresorhus/eslint-plugin-unicorn#preset-configs-eslintconfigjs).\
🔧 Automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/user-guide/command-line-interface#--fix).\
💡 Manually fixable by [editor suggestions](https://eslint.org/docs/latest/use/core-concepts#rule-suggestions).
| Name | Description | 💼 | 🔧 | 💡 |
| :----------------------------------------------------------------------------------------------- | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :- | :- | :- |
| [better-regex](docs/rules/better-regex.md) | Improve regexes by making them shorter, consistent, and safer. | | 🔧 | |
| [catch-error-name](docs/rules/catch-error-name.md) | Enforce a specific parameter name in catch clauses. | ✅ | 🔧 | |
| [consistent-destructuring](docs/rules/consistent-destructuring.md) | Use destructured variables over properties. | | 🔧 | 💡 |
| [consistent-empty-array-spread](docs/rules/consistent-empty-array-spread.md) | Prefer consistent types when spreading a ternary in an array literal. | ✅ | 🔧 | |
| [consistent-existence-index-check](docs/rules/consistent-existence-index-check.md) | Enforce consistent style for element existence checks with `indexOf()`, `lastIndexOf()`, `findIndex()`, and `findLastIndex()`. | ✅ | 🔧 | |
| [consistent-function-scoping](docs/rules/consistent-function-scoping.md) | Move function definitions to the highest possible scope. | ✅ | | |
| [custom-error-definition](docs/rules/custom-error-definition.md) | Enforce correct `Error` subclassing. | | 🔧 | |
| [empty-brace-spaces](docs/rules/empty-brace-spaces.md) | Enforce no spaces between braces. | ✅ | 🔧 | |
| [error-message](docs/rules/error-message.md) | Enforce passing a `message` value when creating a built-in error. | ✅ | | |
| [escape-case](docs/rules/escape-case.md) | Require escape sequences to use uppercase values. | ✅ | 🔧 | |
| [expiring-todo-comments](docs/rules/expiring-todo-comments.md) | Add expiration conditions to TODO comments. | ✅ | | |
| [explicit-length-check](docs/rules/explicit-length-check.md) | Enforce explicitly comparing the `length` or `size` property of a value. | ✅ | 🔧 | 💡 |
| [filename-case](docs/rules/filename-case.md) | Enforce a case style for filenames. | ✅ | | |
| [import-style](docs/rules/import-style.md) | Enforce specific import styles per module. | ✅ | | |
| [new-for-builtins](docs/rules/new-for-builtins.md) | Enforce the use of `new` for all builtins, except `String`, `Number`, `Boolean`, `Symbol` and `BigInt`. | ✅ | 🔧 | |
| [no-abusive-eslint-disable](docs/rules/no-abusive-eslint-disable.md) | Enforce specifying rules to disable in `eslint-disable` comments. | ✅ | | |
| [no-anonymous-default-export](docs/rules/no-anonymous-default-export.md) | Disallow anonymous functions and classes as the default export. | ✅ | | 💡 |
| [no-array-callback-reference](docs/rules/no-array-callback-reference.md) | Prevent passing a function reference directly to iterator methods. | ✅ | | 💡 |
| [no-array-for-each](docs/rules/no-array-for-each.md) | Prefer `for…of` over the `forEach` method. | ✅ | 🔧 | 💡 |
| [no-array-method-this-argument](docs/rules/no-array-method-this-argument.md) | Disallow using the `this` argument in array methods. | ✅ | 🔧 | 💡 |
| [no-array-push-push](docs/rules/no-array-push-push.md) | Enforce combining multiple `Array#push()` into one call. | ✅ | 🔧 | 💡 |
| [no-array-reduce](docs/rules/no-array-reduce.md) | Disallow `Array#reduce()` and `Array#reduceRight()`. | ✅ | | |
| [no-await-expression-member](docs/rules/no-await-expression-member.md) | Disallow member access from await expression. | ✅ | 🔧 | |
| [no-await-in-promise-methods](docs/rules/no-await-in-promise-methods.md) | Disallow using `await` in `Promise` method parameters. | ✅ | | 💡 |
| [no-console-spaces](docs/rules/no-console-spaces.md) | Do not use leading/trailing space between `console.log` parameters. | ✅ | 🔧 | |
| [no-document-cookie](docs/rules/no-document-cookie.md) | Do not use `document.cookie` directly. | ✅ | | |
| [no-empty-file](docs/rules/no-empty-file.md) | Disallow empty files. | ✅ | | |
| [no-for-loop](docs/rules/no-for-loop.md) | Do not use a `for` loop that can be replaced with a `for-of` loop. | ✅ | 🔧 | 💡 |
| [no-hex-escape](docs/rules/no-hex-escape.md) | Enforce the use of Unicode escapes instead of hexadecimal escapes. | ✅ | 🔧 | |
| [no-instanceof-array](docs/rules/no-instanceof-array.md) | Require `Array.isArray()` instead of `instanceof Array`. | ✅ | 🔧 | |
| [no-invalid-fetch-options](docs/rules/no-invalid-fetch-options.md) | Disallow invalid options in `fetch()` and `new Request()`. | ✅ | | |
| [no-invalid-remove-event-listener](docs/rules/no-invalid-remove-event-listener.md) | Prevent calling `EventTarget#removeEventListener()` with the result of an expression. | ✅ | | |
| [no-keyword-prefix](docs/rules/no-keyword-prefix.md) | Disallow identifiers starting with `new` or `class`. | | | |
| [no-length-as-slice-end](docs/rules/no-length-as-slice-end.md) | Disallow using `.length` as the `end` argument of `{Array,String,TypedArray}#slice()`. | ✅ | 🔧 | |
| [no-lonely-if](docs/rules/no-lonely-if.md) | Disallow `if` statements as the only statement in `if` blocks without `else`. | ✅ | 🔧 | |
| [no-magic-array-flat-depth](docs/rules/no-magic-array-flat-depth.md) | Disallow a magic number as the `depth` argument in `Array#flat(…).` | ✅ | | |
| [no-negated-condition](docs/rules/no-negated-condition.md) | Disallow negated conditions. | ✅ | 🔧 | |
| [no-negation-in-equality-check](docs/rules/no-negation-in-equality-check.md) | Disallow negated expression in equality check. | ✅ | | 💡 |
| [no-nested-ternary](docs/rules/no-nested-ternary.md) | Disallow nested ternary expressions. | ✅ | 🔧 | |
| [no-new-array](docs/rules/no-new-array.md) | Disallow `new Array()`. | ✅ | 🔧 | 💡 |
| [no-new-buffer](docs/rules/no-new-buffer.md) | Enforce the use of `Buffer.from()` and `Buffer.alloc()` instead of the deprecated `new Buffer()`. | ✅ | 🔧 | 💡 |
| [no-null](docs/rules/no-null.md) | Disallow the use of the `null` literal. | ✅ | 🔧 | 💡 |
| [no-object-as-default-parameter](docs/rules/no-object-as-default-parameter.md) | Disallow the use of objects as default parameters. | ✅ | | |
| [no-process-exit](docs/rules/no-process-exit.md) | Disallow `process.exit()`. | ✅ | | |
| [no-single-promise-in-promise-methods](docs/rules/no-single-promise-in-promise-methods.md) | Disallow passing single-element arrays to `Promise` methods. | ✅ | 🔧 | 💡 |
| [no-static-only-class](docs/rules/no-static-only-class.md) | Disallow classes that only have static members. | ✅ | 🔧 | |
| [no-thenable](docs/rules/no-thenable.md) | Disallow `then` property. | ✅ | | |
| [no-this-assignment](docs/rules/no-this-assignment.md) | Disallow assigning `this` to a variable. | ✅ | | |
| [no-typeof-undefined](docs/rules/no-typeof-undefined.md) | Disallow comparing `undefined` using `typeof`. | ✅ | 🔧 | 💡 |
| [no-unnecessary-await](docs/rules/no-unnecessary-await.md) | Disallow awaiting non-promise values. | ✅ | 🔧 | |
| [no-unnecessary-polyfills](docs/rules/no-unnecessary-polyfills.md) | Enforce the use of built-in methods instead of unnecessary polyfills. | ✅ | | |
| [no-unreadable-array-destructuring](docs/rules/no-unreadable-array-destructuring.md) | Disallow unreadable array destructuring. | ✅ | 🔧 | |
| [no-unreadable-iife](docs/rules/no-unreadable-iife.md) | Disallow unreadable IIFEs. | ✅ | | |
| [no-unused-properties](docs/rules/no-unused-properties.md) | Disallow unused object properties. | | | |
| [no-useless-fallback-in-spread](docs/rules/no-useless-fallback-in-spread.md) | Disallow useless fallback when spreading in object literals. | ✅ | 🔧 | |
| [no-useless-length-check](docs/rules/no-useless-length-check.md) | Disallow useless array length check. | ✅ | 🔧 | |
| [no-useless-promise-resolve-reject](docs/rules/no-useless-promise-resolve-reject.md) | Disallow returning/yielding `Promise.resolve/reject()` in async functions or promise callbacks | ✅ | 🔧 | |
| [no-useless-spread](docs/rules/no-useless-spread.md) | Disallow unnecessary spread. | ✅ | 🔧 | |
| [no-useless-switch-case](docs/rules/no-useless-switch-case.md) | Disallow useless case in switch statements. | ✅ | | 💡 |
| [no-useless-undefined](docs/rules/no-useless-undefined.md) | Disallow useless `undefined`. | ✅ | 🔧 | |
| [no-zero-fractions](docs/rules/no-zero-fractions.md) | Disallow number literals with zero fractions or dangling dots. | ✅ | 🔧 | |
| [number-literal-case](docs/rules/number-literal-case.md) | Enforce proper case for numeric literals. | ✅ | 🔧 | |
| [numeric-separators-style](docs/rules/numeric-separators-style.md) | Enforce the style of numeric separators by correctly grouping digits. | ✅ | 🔧 | |
| [prefer-add-event-listener](docs/rules/prefer-add-event-listener.md) | Prefer `.addEventListener()` and `.removeEventListener()` over `on`-functions. | ✅ | 🔧 | |
| [prefer-array-find](docs/rules/prefer-array-find.md) | Prefer `.find(…)` and `.findLast(…)` over the first or last element from `.filter(…)`. | ✅ | 🔧 | 💡 |
| [prefer-array-flat](docs/rules/prefer-array-flat.md) | Prefer `Array#flat()` over legacy techniques to flatten arrays. | ✅ | 🔧 | |
| [prefer-array-flat-map](docs/rules/prefer-array-flat-map.md) | Prefer `.flatMap(…)` over `.map(…).flat()`. | ✅ | 🔧 | |
| [prefer-array-index-of](docs/rules/prefer-array-index-of.md) | Prefer `Array#{indexOf,lastIndexOf}()` over `Array#{findIndex,findLastIndex}()` when looking for the index of an item. | ✅ | 🔧 | 💡 |
| [prefer-array-some](docs/rules/prefer-array-some.md) | Prefer `.some(…)` over `.filter(…).length` check and `.{find,findLast,findIndex,findLastIndex}(…)`. | ✅ | 🔧 | 💡 |
| [prefer-at](docs/rules/prefer-at.md) | Prefer `.at()` method for index access and `String#charAt()`. | ✅ | 🔧 | 💡 |
| [prefer-blob-reading-methods](docs/rules/prefer-blob-reading-methods.md) | Prefer `Blob#arrayBuffer()` over `FileReader#readAsArrayBuffer(…)` and `Blob#text()` over `FileReader#readAsText(…)`. | ✅ | | |
| [prefer-code-point](docs/rules/prefer-code-point.md) | Prefer `String#codePointAt(…)` over `String#charCodeAt(…)` and `String.fromCodePoint(…)` over `String.fromCharCode(…)`. | ✅ | | 💡 |
| [prefer-date-now](docs/rules/prefer-date-now.md) | Prefer `Date.now()` to get the number of milliseconds since the Unix Epoch. | ✅ | 🔧 | |
| [prefer-default-parameters](docs/rules/prefer-default-parameters.md) | Prefer default parameters over reassignment. | ✅ | 🔧 | 💡 |
| [prefer-dom-node-append](docs/rules/prefer-dom-node-append.md) | Prefer `Node#append()` over `Node#appendChild()`. | ✅ | 🔧 | |
| [prefer-dom-node-dataset](docs/rules/prefer-dom-node-dataset.md) | Prefer using `.dataset` on DOM elements over calling attribute methods. | ✅ | 🔧 | |
| [prefer-dom-node-remove](docs/rules/prefer-dom-node-remove.md) | Prefer `childNode.remove()` over `parentNode.removeChild(childNode)`. | ✅ | 🔧 | 💡 |
| [prefer-dom-node-text-content](docs/rules/prefer-dom-node-text-content.md) | Prefer `.textContent` over `.innerText`. | ✅ | | 💡 |
| [prefer-event-target](docs/rules/prefer-event-target.md) | Prefer `EventTarget` over `EventEmitter`. | ✅ | | |
| [prefer-export-from](docs/rules/prefer-export-from.md) | Prefer `export…from` when re-exporting. | ✅ | 🔧 | 💡 |
| [prefer-global-this](docs/rules/prefer-global-this.md) | Prefer `globalThis` over `window`, `self`, and `global`. | ✅ | 🔧 | |
| [prefer-includes](docs/rules/prefer-includes.md) | Prefer `.includes()` over `.indexOf()`, `.lastIndexOf()`, and `Array#some()` when checking for existence or non-existence. | ✅ | 🔧 | 💡 |
| [prefer-json-parse-buffer](docs/rules/prefer-json-parse-buffer.md) | Prefer reading a JSON file as a buffer. | | 🔧 | |
| [prefer-keyboard-event-key](docs/rules/prefer-keyboard-event-key.md) | Prefer `KeyboardEvent#key` over `KeyboardEvent#keyCode`. | ✅ | 🔧 | |
| [prefer-logical-operator-over-ternary](docs/rules/prefer-logical-operator-over-ternary.md) | Prefer using a logical operator over a ternary. | ✅ | | 💡 |
| [prefer-math-min-max](docs/rules/prefer-math-min-max.md) | Prefer `Math.min()` and `Math.max()` over ternaries for simple comparisons. | ✅ | 🔧 | |
| [prefer-math-trunc](docs/rules/prefer-math-trunc.md) | Enforce the use of `Math.trunc` instead of bitwise operators. | ✅ | 🔧 | 💡 |
| [prefer-modern-dom-apis](docs/rules/prefer-modern-dom-apis.md) | Prefer `.before()` over `.insertBefore()`, `.replaceWith()` over `.replaceChild()`, prefer one of `.before()`, `.after()`, `.append()` or `.prepend()` over `insertAdjacentText()` and `insertAdjacentElement()`. | ✅ | 🔧 | |
| [prefer-modern-math-apis](docs/rules/prefer-modern-math-apis.md) | Prefer modern `Math` APIs over legacy patterns. | ✅ | 🔧 | |
| [prefer-module](docs/rules/prefer-module.md) | Prefer JavaScript modules (ESM) over CommonJS. | ✅ | 🔧 | 💡 |
| [prefer-native-coercion-functions](docs/rules/prefer-native-coercion-functions.md) | Prefer using `String`, `Number`, `BigInt`, `Boolean`, and `Symbol` directly. | ✅ | 🔧 | |
| [prefer-negative-index](docs/rules/prefer-negative-index.md) | Prefer negative index over `.length - index` when possible. | ✅ | 🔧 | |
| [prefer-node-protocol](docs/rules/prefer-node-protocol.md) | Prefer using the `node:` protocol when importing Node.js builtin modules. | ✅ | 🔧 | |
| [prefer-number-properties](docs/rules/prefer-number-properties.md) | Prefer `Number` static properties over global ones. | ✅ | 🔧 | 💡 |
| [prefer-object-from-entries](docs/rules/prefer-object-from-entries.md) | Prefer using `Object.fromEntries(…)` to transform a list of key-value pairs into an object. | ✅ | 🔧 | |
| [prefer-optional-catch-binding](docs/rules/prefer-optional-catch-binding.md) | Prefer omitting the `catch` binding parameter. | ✅ | 🔧 | |
| [prefer-prototype-methods](docs/rules/prefer-prototype-methods.md) | Prefer borrowing methods from the prototype instead of the instance. | ✅ | 🔧 | |
| [prefer-query-selector](docs/rules/prefer-query-selector.md) | Prefer `.querySelector()` over `.getElementById()`, `.querySelectorAll()` over `.getElementsByClassName()` and `.getElementsByTagName()` and `.getElementsByName()`. | ✅ | 🔧 | |
| [prefer-reflect-apply](docs/rules/prefer-reflect-apply.md) | Prefer `Reflect.apply()` over `Function#apply()`. | ✅ | 🔧 | |
| [prefer-regexp-test](docs/rules/prefer-regexp-test.md) | Prefer `RegExp#test()` over `String#match()` and `RegExp#exec()`. | ✅ | 🔧 | 💡 |
| [prefer-set-has](docs/rules/prefer-set-has.md) | Prefer `Set#has()` over `Array#includes()` when checking for existence or non-existence. | ✅ | 🔧 | 💡 |
| [prefer-set-size](docs/rules/prefer-set-size.md) | Prefer using `Set#size` instead of `Array#length`. | ✅ | 🔧 | |
| [prefer-spread](docs/rules/prefer-spread.md) | Prefer the spread operator over `Array.from(…)`, `Array#concat(…)`, `Array#{slice,toSpliced}()` and `String#split('')`. | ✅ | 🔧 | 💡 |
| [prefer-string-raw](docs/rules/prefer-string-raw.md) | Prefer using the `String.raw` tag to avoid escaping `\`. | ✅ | 🔧 | |
| [prefer-string-replace-all](docs/rules/prefer-string-replace-all.md) | Prefer `String#replaceAll()` over regex searches with the global flag. | ✅ | 🔧 | |
| [prefer-string-slice](docs/rules/prefer-string-slice.md) | Prefer `String#slice()` over `String#substr()` and `String#substring()`. | ✅ | 🔧 | |
| [prefer-string-starts-ends-with](docs/rules/prefer-string-starts-ends-with.md) | Prefer `String#startsWith()` & `String#endsWith()` over `RegExp#test()`. | ✅ | 🔧 | 💡 |
| [prefer-string-trim-start-end](docs/rules/prefer-string-trim-start-end.md) | Prefer `String#trimStart()` / `String#trimEnd()` over `String#trimLeft()` / `String#trimRight()`. | ✅ | 🔧 | |
| [prefer-structured-clone](docs/rules/prefer-structured-clone.md) | Prefer using `structuredClone` to create a deep clone. | ✅ | | 💡 |
| [prefer-switch](docs/rules/prefer-switch.md) | Prefer `switch` over multiple `else-if`. | ✅ | 🔧 | |
| [prefer-ternary](docs/rules/prefer-ternary.md) | Prefer ternary expressions over simple `if-else` statements. | ✅ | 🔧 | |
| [prefer-top-level-await](docs/rules/prefer-top-level-await.md) | Prefer top-level await over top-level promises and async function calls. | ✅ | | 💡 |
| [prefer-type-error](docs/rules/prefer-type-error.md) | Enforce throwing `TypeError` in type checking conditions. | ✅ | 🔧 | |
| [prevent-abbreviations](docs/rules/prevent-abbreviations.md) | Prevent abbreviations. | ✅ | 🔧 | |
| [relative-url-style](docs/rules/relative-url-style.md) | Enforce consistent relative URL style. | ✅ | 🔧 | 💡 |
| [require-array-join-separator](docs/rules/require-array-join-separator.md) | Enforce using the separator argument with `Array#join()`. | ✅ | 🔧 | |
| [require-number-to-fixed-digits-argument](docs/rules/require-number-to-fixed-digits-argument.md) | Enforce using the digits argument with `Number#toFixed()`. | ✅ | 🔧 | |
| [require-post-message-target-origin](docs/rules/require-post-message-target-origin.md) | Enforce using the `targetOrigin` argument with `window.postMessage()`. | | | 💡 |
| [string-content](docs/rules/string-content.md) | Enforce better string content. | | 🔧 | 💡 |
| [switch-case-braces](docs/rules/switch-case-braces.md) | Enforce consistent brace style for `case` clauses. | ✅ | 🔧 | |
| [template-indent](docs/rules/template-indent.md) | Fix whitespace-insensitive template indentation. | ✅ | 🔧 | |
| [text-encoding-identifier-case](docs/rules/text-encoding-identifier-case.md) | Enforce consistent case for text encoding identifiers. | ✅ | 🔧 | 💡 |
| [throw-new-error](docs/rules/throw-new-error.md) | Require `new` when creating an error. | ✅ | 🔧 | |
### Deprecated Rules
See [docs/deprecated-rules.md](docs/deprecated-rules.md)
## Preset configs
See the [ESLint docs](https://eslint.org/docs/latest/use/configure/configuration-files) for more information about extending config files.
**Note**: Preset configs will also enable the correct [language options](https://eslint.org/docs/latest/use/configure/language-options).
### Recommended config
This plugin exports a `recommended` config that enforces good practices.
```js
import eslintPluginUnicorn from 'eslint-plugin-unicorn';
export default [
// …
eslintPluginUnicorn.configs.recommended,
{
rules: {
'unicorn/better-regex': 'warn',
},
},
];
```
### All config
This plugin exports an `all` that makes use of all rules (except for deprecated ones).
```js
import eslintPluginUnicorn from 'eslint-plugin-unicorn';
export default [
// …
eslintPluginUnicorn.configs.all,
{
rules: {
'unicorn/better-regex': 'warn',
},
},
];
```
## Maintainers
- [Sindre Sorhus](https://github.com/sindresorhus)
- [Fisker Cheung](https://github.com/fisker)
- [Bryan Mishkin](https://github.com/bmish)
- [futpib](https://github.com/futpib)
### Former
- [Jeroen Engels](https://github.com/jfmengels)
- [Sam Verschueren](https://github.com/SamVerschueren)
- [Adam Babcock](https://github.com/MrHen)