From 4d127a038bf768eded68aae3cfa5c1b12241bdac Mon Sep 17 00:00:00 2001
From: Maze Winther <mazewinther@gmail.com>
Date: Fri, 27 Mar 2026 00:55:15 +0100
Subject: chore: normalize line endings

---
 .github/copilot-instructions.md | 688 ++++++++++++++++++++--------------------
 1 file changed, 344 insertions(+), 344 deletions(-)

(limited to '.github/copilot-instructions.md')

diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 77e361d1..c30aecc2 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -1,344 +1,344 @@
----
-applyTo: "**/*.{ts,tsx,js,jsx}"
----
-
-# Project Context
-
-Ultracite enforces strict type safety, accessibility standards, and consistent code quality for JavaScript/TypeScript projects using Biome's lightning-fast formatter and linter.
-
-## Key Principles
-
-- Zero configuration required
-- Subsecond performance
-- Maximum type safety
-- AI-friendly code generation
-
-## Before Writing Code
-
-1. Analyze existing patterns in the codebase
-2. Consider edge cases and error scenarios
-3. Follow the rules below strictly
-4. Validate accessibility requirements
-
-## Rules
-
-### Accessibility (a11y)
-
-- Don't use `accessKey` attribute on any HTML element.
-- Don't set `aria-hidden="true"` on focusable elements.
-- Don't add ARIA roles, states, and properties to elements that don't support them.
-- Don't use distracting elements like `<marquee>` or `<blink>`.
-- Only use the `scope` prop on `<th>` elements.
-- Don't assign non-interactive ARIA roles to interactive HTML elements.
-- Make sure label elements have text content and are associated with an input.
-- Don't assign interactive ARIA roles to non-interactive HTML elements.
-- Don't assign `tabIndex` to non-interactive HTML elements.
-- Don't use positive integers for `tabIndex` property.
-- Don't include "image", "picture", or "photo" in img alt prop.
-- Don't use explicit role property that's the same as the implicit/default role.
-- Make static elements with click handlers use a valid role attribute.
-- Always include a `title` element for SVG elements.
-- Give all elements requiring alt text meaningful information for screen readers.
-- Make sure anchors have content that's accessible to screen readers.
-- Assign `tabIndex` to non-interactive HTML elements with `aria-activedescendant`.
-- Include all required ARIA attributes for elements with ARIA roles.
-- Make sure ARIA properties are valid for the element's supported roles.
-- Always include a `type` attribute for button elements.
-- Make elements with interactive roles and handlers focusable.
-- Give heading elements content that's accessible to screen readers (not hidden with `aria-hidden`).
-- Always include a `lang` attribute on the html element.
-- Always include a `title` attribute for iframe elements.
-- Accompany `onClick` with at least one of: `onKeyUp`, `onKeyDown`, or `onKeyPress`.
-- Accompany `onMouseOver`/`onMouseOut` with `onFocus`/`onBlur`.
-- Include caption tracks for audio and video elements.
-- Use semantic elements instead of role attributes in JSX.
-- Make sure all anchors are valid and navigable.
-- Ensure all ARIA properties (`aria-*`) are valid.
-- Use valid, non-abstract ARIA roles for elements with ARIA roles.
-- Use valid ARIA state and property values.
-- Use valid values for the `autocomplete` attribute on input elements.
-- Use correct ISO language/country codes for the `lang` attribute.
-
-### Code Complexity and Quality
-
-- Don't use consecutive spaces in regular expression literals.
-- Don't use the `arguments` object.
-- Don't use primitive type aliases or misleading types.
-- Don't use the comma operator.
-- Don't use empty type parameters in type aliases and interfaces.
-- Don't write functions that exceed a given Cognitive Complexity score.
-- Don't nest describe() blocks too deeply in test files.
-- Don't use unnecessary boolean casts.
-- Don't use unnecessary callbacks with flatMap.
-- Use for...of statements instead of Array.forEach.
-- Don't create classes that only have static members (like a static namespace).
-- Don't use this and super in static contexts.
-- Don't use unnecessary catch clauses.
-- Don't use unnecessary constructors.
-- Don't use unnecessary continue statements.
-- Don't export empty modules that don't change anything.
-- Don't use unnecessary escape sequences in regular expression literals.
-- Don't use unnecessary fragments.
-- Don't use unnecessary labels.
-- Don't use unnecessary nested block statements.
-- Don't rename imports, exports, and destructured assignments to the same name.
-- Don't use unnecessary string or template literal concatenation.
-- Don't use String.raw in template literals when there are no escape sequences.
-- Don't use useless case statements in switch statements.
-- Don't use ternary operators when simpler alternatives exist.
-- Don't use useless `this` aliasing.
-- Don't use any or unknown as type constraints.
-- Don't initialize variables to undefined.
-- Don't use the void operators (they're not familiar).
-- Use arrow functions instead of function expressions.
-- Use Date.now() to get milliseconds since the Unix Epoch.
-- Use .flatMap() instead of map().flat() when possible.
-- Use literal property access instead of computed property access.
-- Don't use parseInt() or Number.parseInt() when binary, octal, or hexadecimal literals work.
-- Use concise optional chaining instead of chained logical expressions.
-- Use regular expression literals instead of the RegExp constructor when possible.
-- Don't use number literal object member names that aren't base 10 or use underscore separators.
-- Remove redundant terms from logical expressions.
-- Use while loops instead of for loops when you don't need initializer and update expressions.
-- Don't pass children as props.
-- Don't reassign const variables.
-- Don't use constant expressions in conditions.
-- Don't use `Math.min` and `Math.max` to clamp values when the result is constant.
-- Don't return a value from a constructor.
-- Don't use empty character classes in regular expression literals.
-- Don't use empty destructuring patterns.
-- Don't call global object properties as functions.
-- Don't declare functions and vars that are accessible outside their block.
-- Make sure builtins are correctly instantiated.
-- Don't use super() incorrectly inside classes. Also check that super() is called in classes that extend other constructors.
-- Don't use variables and function parameters before they're declared.
-- Don't use 8 and 9 escape sequences in string literals.
-- Don't use literal numbers that lose precision.
-
-### React and JSX Best Practices
-
-- Don't use the return value of React.render.
-- Make sure all dependencies are correctly specified in React hooks.
-- Make sure all React hooks are called from the top level of component functions.
-- Don't forget key props in iterators and collection literals.
-- Don't destructure props inside JSX components in Solid projects.
-- Don't define React components inside other components.
-- Don't use event handlers on non-interactive elements.
-- Don't assign to React component props.
-- Don't use both `children` and `dangerouslySetInnerHTML` props on the same element.
-- Don't use dangerous JSX props.
-- Don't use Array index in keys.
-- Don't insert comments as text nodes.
-- Don't assign JSX properties multiple times.
-- Don't add extra closing tags for components without children.
-- Use `<>...</>` instead of `<Fragment>...</Fragment>`.
-- Watch out for possible "wrong" semicolons inside JSX elements.
-
-### Correctness and Safety
-
-- Don't assign a value to itself.
-- Don't return a value from a setter.
-- Don't compare expressions that modify string case with non-compliant values.
-- Don't use lexical declarations in switch clauses.
-- Don't use variables that haven't been declared in the document.
-- Don't write unreachable code.
-- Make sure super() is called exactly once on every code path in a class constructor before this is accessed if the class has a superclass.
-- Don't use control flow statements in finally blocks.
-- Don't use optional chaining where undefined values aren't allowed.
-- Don't have unused function parameters.
-- Don't have unused imports.
-- Don't have unused labels.
-- Don't have unused private class members.
-- Don't have unused variables.
-- Make sure void (self-closing) elements don't have children.
-- Don't return a value from a function with the return type 'void'
-- Use isNaN() when checking for NaN.
-- Make sure "for" loop update clauses move the counter in the right direction.
-- Make sure typeof expressions are compared to valid values.
-- Make sure generator functions contain yield.
-- Don't use await inside loops.
-- Don't use bitwise operators.
-- Don't use expressions where the operation doesn't change the value.
-- Make sure Promise-like statements are handled appropriately.
-- Don't use **dirname and **filename in the global scope.
-- Prevent import cycles.
-- Don't use configured elements.
-- Don't hardcode sensitive data like API keys and tokens.
-- Don't let variable declarations shadow variables from outer scopes.
-- Don't use the TypeScript directive @ts-ignore.
-- Prevent duplicate polyfills from Polyfill.io.
-- Don't use useless backreferences in regular expressions that always match empty strings.
-- Don't use unnecessary escapes in string literals.
-- Don't use useless undefined.
-- Make sure getters and setters for the same property are next to each other in class and object definitions.
-- Make sure object literals are declared consistently (defaults to explicit definitions).
-- Use static Response methods instead of new Response() constructor when possible.
-- Make sure switch-case statements are exhaustive.
-- Make sure the `preconnect` attribute is used when using Google Fonts.
-- Use `Array#{indexOf,lastIndexOf}()` instead of `Array#{findIndex,findLastIndex}()` when looking for the index of an item.
-- Make sure iterable callbacks return consistent values.
-- Use `with { type: "json" }` for JSON module imports.
-- Use numeric separators in numeric literals.
-- Use object spread instead of `Object.assign()` when constructing new objects.
-- Always use the radix argument when using `parseInt()`.
-- Make sure JSDoc comment lines start with a single asterisk, except for the first one.
-- Include a description parameter for `Symbol()`.
-- Don't use spread (`...`) syntax on accumulators.
-- Don't use the `delete` operator.
-- Don't access namespace imports dynamically.
-- Don't use namespace imports.
-- Declare regex literals at the top level.
-- Don't use `target="_blank"` without `rel="noopener"`.
-
-### TypeScript Best Practices
-
-- Don't use TypeScript enums.
-- Don't export imported variables.
-- Don't add type annotations to variables, parameters, and class properties that are initialized with literal expressions.
-- Don't use TypeScript namespaces.
-- Don't use non-null assertions with the `!` postfix operator.
-- Don't use parameter properties in class constructors.
-- Don't use user-defined types.
-- Use `as const` instead of literal types and type annotations.
-- Use either `T[]` or `Array<T>` consistently.
-- Initialize each enum member value explicitly.
-- Use `export type` for types.
-- Use `import type` for types.
-- Make sure all enum members are literal values.
-- Don't use TypeScript const enum.
-- Don't declare empty interfaces.
-- Don't let variables evolve into any type through reassignments.
-- Don't use the any type.
-- Don't misuse the non-null assertion operator (!) in TypeScript files.
-- Don't use implicit any type on variable declarations.
-- Don't merge interfaces and classes unsafely.
-- Don't use overload signatures that aren't next to each other.
-- Use the namespace keyword instead of the module keyword to declare TypeScript namespaces.
-
-### Style and Consistency
-
-- Don't use global `eval()`.
-- Don't use callbacks in asynchronous tests and hooks.
-- Don't use negation in `if` statements that have `else` clauses.
-- Don't use nested ternary expressions.
-- Don't reassign function parameters.
-- This rule lets you specify global variable names you don't want to use in your application.
-- Don't use specified modules when loaded by import or require.
-- Don't use constants whose value is the upper-case version of their name.
-- Use `String.slice()` instead of `String.substr()` and `String.substring()`.
-- Don't use template literals if you don't need interpolation or special-character handling.
-- Don't use `else` blocks when the `if` block breaks early.
-- Don't use yoda expressions.
-- Don't use Array constructors.
-- Use `at()` instead of integer index access.
-- Follow curly brace conventions.
-- Use `else if` instead of nested `if` statements in `else` clauses.
-- Use single `if` statements instead of nested `if` clauses.
-- Use `new` for all builtins except `String`, `Number`, and `Boolean`.
-- Use consistent accessibility modifiers on class properties and methods.
-- Use `const` declarations for variables that are only assigned once.
-- Put default function parameters and optional function parameters last.
-- Include a `default` clause in switch statements.
-- Use the `**` operator instead of `Math.pow`.
-- Use `for-of` loops when you need the index to extract an item from the iterated array.
-- Use `node:assert/strict` over `node:assert`.
-- Use the `node:` protocol for Node.js builtin modules.
-- Use Number properties instead of global ones.
-- Use assignment operator shorthand where possible.
-- Use function types instead of object types with call signatures.
-- Use template literals over string concatenation.
-- Use `new` when throwing an error.
-- Don't throw non-Error values.
-- Use `String.trimStart()` and `String.trimEnd()` over `String.trimLeft()` and `String.trimRight()`.
-- Use standard constants instead of approximated literals.
-- Don't assign values in expressions.
-- Don't use async functions as Promise executors.
-- Don't reassign exceptions in catch clauses.
-- Don't reassign class members.
-- Don't compare against -0.
-- Don't use labeled statements that aren't loops.
-- Don't use void type outside of generic or return types.
-- Don't use console.
-- Don't use control characters and escape sequences that match control characters in regular expression literals.
-- Don't use debugger.
-- Don't assign directly to document.cookie.
-- Use `===` and `!==`.
-- Don't use duplicate case labels.
-- Don't use duplicate class members.
-- Don't use duplicate conditions in if-else-if chains.
-- Don't use two keys with the same name inside objects.
-- Don't use duplicate function parameter names.
-- Don't have duplicate hooks in describe blocks.
-- Don't use empty block statements and static blocks.
-- Don't let switch clauses fall through.
-- Don't reassign function declarations.
-- Don't allow assignments to native objects and read-only global variables.
-- Use Number.isFinite instead of global isFinite.
-- Use Number.isNaN instead of global isNaN.
-- Don't assign to imported bindings.
-- Don't use irregular whitespace characters.
-- Don't use labels that share a name with a variable.
-- Don't use characters made with multiple code points in character class syntax.
-- Make sure to use new and constructor properly.
-- Don't use shorthand assign when the variable appears on both sides.
-- Don't use octal escape sequences in string literals.
-- Don't use Object.prototype builtins directly.
-- Don't redeclare variables, functions, classes, and types in the same scope.
-- Don't have redundant "use strict".
-- Don't compare things where both sides are exactly the same.
-- Don't let identifiers shadow restricted names.
-- Don't use sparse arrays (arrays with holes).
-- Don't use template literal placeholder syntax in regular strings.
-- Don't use the then property.
-- Don't use unsafe negation.
-- Don't use var.
-- Don't use with statements in non-strict contexts.
-- Make sure async functions actually use await.
-- Make sure default clauses in switch statements come last.
-- Make sure to pass a message value when creating a built-in error.
-- Make sure get methods always return a value.
-- Use a recommended display strategy with Google Fonts.
-- Make sure for-in loops include an if statement.
-- Use Array.isArray() instead of instanceof Array.
-- Make sure to use the digits argument with Number#toFixed().
-- Make sure to use the "use strict" directive in script files.
-
-### Next.js Specific Rules
-
-- Don't use `<img>` elements in Next.js projects.
-- Don't use `<head>` elements in Next.js projects.
-- Don't import next/document outside of pages/\_document.jsx in Next.js projects.
-- Don't use the next/head module in pages/\_document.js on Next.js projects.
-
-### Testing Best Practices
-
-- Don't use export or module.exports in test files.
-- Don't use focused tests.
-- Make sure the assertion function, like expect, is placed inside an it() function call.
-- Don't use disabled tests.
-
-## Common Tasks
-
-- `npx ultracite init` - Initialize Ultracite in your project
-- `npx ultracite format` - Format and fix code automatically
-- `npx ultracite lint` - Check for issues without fixing
-
-## Example: Error Handling
-
-```typescript
-// ✅ Good: Comprehensive error handling
-try {
-  const result = await fetchData();
-  return { success: true, data: result };
-} catch (error) {
-  console.error("API call failed:", error);
-  return { success: false, error: error.message };
-}
-
-// ❌ Bad: Swallowing errors
-try {
-  return await fetchData();
-} catch (e) {
-  console.log(e);
-}
-```
+---
+applyTo: "**/*.{ts,tsx,js,jsx}"
+---
+
+# Project Context
+
+Ultracite enforces strict type safety, accessibility standards, and consistent code quality for JavaScript/TypeScript projects using Biome's lightning-fast formatter and linter.
+
+## Key Principles
+
+- Zero configuration required
+- Subsecond performance
+- Maximum type safety
+- AI-friendly code generation
+
+## Before Writing Code
+
+1. Analyze existing patterns in the codebase
+2. Consider edge cases and error scenarios
+3. Follow the rules below strictly
+4. Validate accessibility requirements
+
+## Rules
+
+### Accessibility (a11y)
+
+- Don't use `accessKey` attribute on any HTML element.
+- Don't set `aria-hidden="true"` on focusable elements.
+- Don't add ARIA roles, states, and properties to elements that don't support them.
+- Don't use distracting elements like `<marquee>` or `<blink>`.
+- Only use the `scope` prop on `<th>` elements.
+- Don't assign non-interactive ARIA roles to interactive HTML elements.
+- Make sure label elements have text content and are associated with an input.
+- Don't assign interactive ARIA roles to non-interactive HTML elements.
+- Don't assign `tabIndex` to non-interactive HTML elements.
+- Don't use positive integers for `tabIndex` property.
+- Don't include "image", "picture", or "photo" in img alt prop.
+- Don't use explicit role property that's the same as the implicit/default role.
+- Make static elements with click handlers use a valid role attribute.
+- Always include a `title` element for SVG elements.
+- Give all elements requiring alt text meaningful information for screen readers.
+- Make sure anchors have content that's accessible to screen readers.
+- Assign `tabIndex` to non-interactive HTML elements with `aria-activedescendant`.
+- Include all required ARIA attributes for elements with ARIA roles.
+- Make sure ARIA properties are valid for the element's supported roles.
+- Always include a `type` attribute for button elements.
+- Make elements with interactive roles and handlers focusable.
+- Give heading elements content that's accessible to screen readers (not hidden with `aria-hidden`).
+- Always include a `lang` attribute on the html element.
+- Always include a `title` attribute for iframe elements.
+- Accompany `onClick` with at least one of: `onKeyUp`, `onKeyDown`, or `onKeyPress`.
+- Accompany `onMouseOver`/`onMouseOut` with `onFocus`/`onBlur`.
+- Include caption tracks for audio and video elements.
+- Use semantic elements instead of role attributes in JSX.
+- Make sure all anchors are valid and navigable.
+- Ensure all ARIA properties (`aria-*`) are valid.
+- Use valid, non-abstract ARIA roles for elements with ARIA roles.
+- Use valid ARIA state and property values.
+- Use valid values for the `autocomplete` attribute on input elements.
+- Use correct ISO language/country codes for the `lang` attribute.
+
+### Code Complexity and Quality
+
+- Don't use consecutive spaces in regular expression literals.
+- Don't use the `arguments` object.
+- Don't use primitive type aliases or misleading types.
+- Don't use the comma operator.
+- Don't use empty type parameters in type aliases and interfaces.
+- Don't write functions that exceed a given Cognitive Complexity score.
+- Don't nest describe() blocks too deeply in test files.
+- Don't use unnecessary boolean casts.
+- Don't use unnecessary callbacks with flatMap.
+- Use for...of statements instead of Array.forEach.
+- Don't create classes that only have static members (like a static namespace).
+- Don't use this and super in static contexts.
+- Don't use unnecessary catch clauses.
+- Don't use unnecessary constructors.
+- Don't use unnecessary continue statements.
+- Don't export empty modules that don't change anything.
+- Don't use unnecessary escape sequences in regular expression literals.
+- Don't use unnecessary fragments.
+- Don't use unnecessary labels.
+- Don't use unnecessary nested block statements.
+- Don't rename imports, exports, and destructured assignments to the same name.
+- Don't use unnecessary string or template literal concatenation.
+- Don't use String.raw in template literals when there are no escape sequences.
+- Don't use useless case statements in switch statements.
+- Don't use ternary operators when simpler alternatives exist.
+- Don't use useless `this` aliasing.
+- Don't use any or unknown as type constraints.
+- Don't initialize variables to undefined.
+- Don't use the void operators (they're not familiar).
+- Use arrow functions instead of function expressions.
+- Use Date.now() to get milliseconds since the Unix Epoch.
+- Use .flatMap() instead of map().flat() when possible.
+- Use literal property access instead of computed property access.
+- Don't use parseInt() or Number.parseInt() when binary, octal, or hexadecimal literals work.
+- Use concise optional chaining instead of chained logical expressions.
+- Use regular expression literals instead of the RegExp constructor when possible.
+- Don't use number literal object member names that aren't base 10 or use underscore separators.
+- Remove redundant terms from logical expressions.
+- Use while loops instead of for loops when you don't need initializer and update expressions.
+- Don't pass children as props.
+- Don't reassign const variables.
+- Don't use constant expressions in conditions.
+- Don't use `Math.min` and `Math.max` to clamp values when the result is constant.
+- Don't return a value from a constructor.
+- Don't use empty character classes in regular expression literals.
+- Don't use empty destructuring patterns.
+- Don't call global object properties as functions.
+- Don't declare functions and vars that are accessible outside their block.
+- Make sure builtins are correctly instantiated.
+- Don't use super() incorrectly inside classes. Also check that super() is called in classes that extend other constructors.
+- Don't use variables and function parameters before they're declared.
+- Don't use 8 and 9 escape sequences in string literals.
+- Don't use literal numbers that lose precision.
+
+### React and JSX Best Practices
+
+- Don't use the return value of React.render.
+- Make sure all dependencies are correctly specified in React hooks.
+- Make sure all React hooks are called from the top level of component functions.
+- Don't forget key props in iterators and collection literals.
+- Don't destructure props inside JSX components in Solid projects.
+- Don't define React components inside other components.
+- Don't use event handlers on non-interactive elements.
+- Don't assign to React component props.
+- Don't use both `children` and `dangerouslySetInnerHTML` props on the same element.
+- Don't use dangerous JSX props.
+- Don't use Array index in keys.
+- Don't insert comments as text nodes.
+- Don't assign JSX properties multiple times.
+- Don't add extra closing tags for components without children.
+- Use `<>...</>` instead of `<Fragment>...</Fragment>`.
+- Watch out for possible "wrong" semicolons inside JSX elements.
+
+### Correctness and Safety
+
+- Don't assign a value to itself.
+- Don't return a value from a setter.
+- Don't compare expressions that modify string case with non-compliant values.
+- Don't use lexical declarations in switch clauses.
+- Don't use variables that haven't been declared in the document.
+- Don't write unreachable code.
+- Make sure super() is called exactly once on every code path in a class constructor before this is accessed if the class has a superclass.
+- Don't use control flow statements in finally blocks.
+- Don't use optional chaining where undefined values aren't allowed.
+- Don't have unused function parameters.
+- Don't have unused imports.
+- Don't have unused labels.
+- Don't have unused private class members.
+- Don't have unused variables.
+- Make sure void (self-closing) elements don't have children.
+- Don't return a value from a function with the return type 'void'
+- Use isNaN() when checking for NaN.
+- Make sure "for" loop update clauses move the counter in the right direction.
+- Make sure typeof expressions are compared to valid values.
+- Make sure generator functions contain yield.
+- Don't use await inside loops.
+- Don't use bitwise operators.
+- Don't use expressions where the operation doesn't change the value.
+- Make sure Promise-like statements are handled appropriately.
+- Don't use **dirname and **filename in the global scope.
+- Prevent import cycles.
+- Don't use configured elements.
+- Don't hardcode sensitive data like API keys and tokens.
+- Don't let variable declarations shadow variables from outer scopes.
+- Don't use the TypeScript directive @ts-ignore.
+- Prevent duplicate polyfills from Polyfill.io.
+- Don't use useless backreferences in regular expressions that always match empty strings.
+- Don't use unnecessary escapes in string literals.
+- Don't use useless undefined.
+- Make sure getters and setters for the same property are next to each other in class and object definitions.
+- Make sure object literals are declared consistently (defaults to explicit definitions).
+- Use static Response methods instead of new Response() constructor when possible.
+- Make sure switch-case statements are exhaustive.
+- Make sure the `preconnect` attribute is used when using Google Fonts.
+- Use `Array#{indexOf,lastIndexOf}()` instead of `Array#{findIndex,findLastIndex}()` when looking for the index of an item.
+- Make sure iterable callbacks return consistent values.
+- Use `with { type: "json" }` for JSON module imports.
+- Use numeric separators in numeric literals.
+- Use object spread instead of `Object.assign()` when constructing new objects.
+- Always use the radix argument when using `parseInt()`.
+- Make sure JSDoc comment lines start with a single asterisk, except for the first one.
+- Include a description parameter for `Symbol()`.
+- Don't use spread (`...`) syntax on accumulators.
+- Don't use the `delete` operator.
+- Don't access namespace imports dynamically.
+- Don't use namespace imports.
+- Declare regex literals at the top level.
+- Don't use `target="_blank"` without `rel="noopener"`.
+
+### TypeScript Best Practices
+
+- Don't use TypeScript enums.
+- Don't export imported variables.
+- Don't add type annotations to variables, parameters, and class properties that are initialized with literal expressions.
+- Don't use TypeScript namespaces.
+- Don't use non-null assertions with the `!` postfix operator.
+- Don't use parameter properties in class constructors.
+- Don't use user-defined types.
+- Use `as const` instead of literal types and type annotations.
+- Use either `T[]` or `Array<T>` consistently.
+- Initialize each enum member value explicitly.
+- Use `export type` for types.
+- Use `import type` for types.
+- Make sure all enum members are literal values.
+- Don't use TypeScript const enum.
+- Don't declare empty interfaces.
+- Don't let variables evolve into any type through reassignments.
+- Don't use the any type.
+- Don't misuse the non-null assertion operator (!) in TypeScript files.
+- Don't use implicit any type on variable declarations.
+- Don't merge interfaces and classes unsafely.
+- Don't use overload signatures that aren't next to each other.
+- Use the namespace keyword instead of the module keyword to declare TypeScript namespaces.
+
+### Style and Consistency
+
+- Don't use global `eval()`.
+- Don't use callbacks in asynchronous tests and hooks.
+- Don't use negation in `if` statements that have `else` clauses.
+- Don't use nested ternary expressions.
+- Don't reassign function parameters.
+- This rule lets you specify global variable names you don't want to use in your application.
+- Don't use specified modules when loaded by import or require.
+- Don't use constants whose value is the upper-case version of their name.
+- Use `String.slice()` instead of `String.substr()` and `String.substring()`.
+- Don't use template literals if you don't need interpolation or special-character handling.
+- Don't use `else` blocks when the `if` block breaks early.
+- Don't use yoda expressions.
+- Don't use Array constructors.
+- Use `at()` instead of integer index access.
+- Follow curly brace conventions.
+- Use `else if` instead of nested `if` statements in `else` clauses.
+- Use single `if` statements instead of nested `if` clauses.
+- Use `new` for all builtins except `String`, `Number`, and `Boolean`.
+- Use consistent accessibility modifiers on class properties and methods.
+- Use `const` declarations for variables that are only assigned once.
+- Put default function parameters and optional function parameters last.
+- Include a `default` clause in switch statements.
+- Use the `**` operator instead of `Math.pow`.
+- Use `for-of` loops when you need the index to extract an item from the iterated array.
+- Use `node:assert/strict` over `node:assert`.
+- Use the `node:` protocol for Node.js builtin modules.
+- Use Number properties instead of global ones.
+- Use assignment operator shorthand where possible.
+- Use function types instead of object types with call signatures.
+- Use template literals over string concatenation.
+- Use `new` when throwing an error.
+- Don't throw non-Error values.
+- Use `String.trimStart()` and `String.trimEnd()` over `String.trimLeft()` and `String.trimRight()`.
+- Use standard constants instead of approximated literals.
+- Don't assign values in expressions.
+- Don't use async functions as Promise executors.
+- Don't reassign exceptions in catch clauses.
+- Don't reassign class members.
+- Don't compare against -0.
+- Don't use labeled statements that aren't loops.
+- Don't use void type outside of generic or return types.
+- Don't use console.
+- Don't use control characters and escape sequences that match control characters in regular expression literals.
+- Don't use debugger.
+- Don't assign directly to document.cookie.
+- Use `===` and `!==`.
+- Don't use duplicate case labels.
+- Don't use duplicate class members.
+- Don't use duplicate conditions in if-else-if chains.
+- Don't use two keys with the same name inside objects.
+- Don't use duplicate function parameter names.
+- Don't have duplicate hooks in describe blocks.
+- Don't use empty block statements and static blocks.
+- Don't let switch clauses fall through.
+- Don't reassign function declarations.
+- Don't allow assignments to native objects and read-only global variables.
+- Use Number.isFinite instead of global isFinite.
+- Use Number.isNaN instead of global isNaN.
+- Don't assign to imported bindings.
+- Don't use irregular whitespace characters.
+- Don't use labels that share a name with a variable.
+- Don't use characters made with multiple code points in character class syntax.
+- Make sure to use new and constructor properly.
+- Don't use shorthand assign when the variable appears on both sides.
+- Don't use octal escape sequences in string literals.
+- Don't use Object.prototype builtins directly.
+- Don't redeclare variables, functions, classes, and types in the same scope.
+- Don't have redundant "use strict".
+- Don't compare things where both sides are exactly the same.
+- Don't let identifiers shadow restricted names.
+- Don't use sparse arrays (arrays with holes).
+- Don't use template literal placeholder syntax in regular strings.
+- Don't use the then property.
+- Don't use unsafe negation.
+- Don't use var.
+- Don't use with statements in non-strict contexts.
+- Make sure async functions actually use await.
+- Make sure default clauses in switch statements come last.
+- Make sure to pass a message value when creating a built-in error.
+- Make sure get methods always return a value.
+- Use a recommended display strategy with Google Fonts.
+- Make sure for-in loops include an if statement.
+- Use Array.isArray() instead of instanceof Array.
+- Make sure to use the digits argument with Number#toFixed().
+- Make sure to use the "use strict" directive in script files.
+
+### Next.js Specific Rules
+
+- Don't use `<img>` elements in Next.js projects.
+- Don't use `<head>` elements in Next.js projects.
+- Don't import next/document outside of pages/\_document.jsx in Next.js projects.
+- Don't use the next/head module in pages/\_document.js on Next.js projects.
+
+### Testing Best Practices
+
+- Don't use export or module.exports in test files.
+- Don't use focused tests.
+- Make sure the assertion function, like expect, is placed inside an it() function call.
+- Don't use disabled tests.
+
+## Common Tasks
+
+- `npx ultracite init` - Initialize Ultracite in your project
+- `npx ultracite format` - Format and fix code automatically
+- `npx ultracite lint` - Check for issues without fixing
+
+## Example: Error Handling
+
+```typescript
+// ✅ Good: Comprehensive error handling
+try {
+  const result = await fetchData();
+  return { success: true, data: result };
+} catch (error) {
+  console.error("API call failed:", error);
+  return { success: false, error: error.message };
+}
+
+// ❌ Bad: Swallowing errors
+try {
+  return await fetchData();
+} catch (e) {
+  console.log(e);
+}
+```
-- 
cgit v1.3.1