### React Component Wrapping with forEach

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Demonstrates a simple approach in React to wrap a component multiple times using `useState` and `forEach`. This method is less efficient for dynamic nesting as it creates new JSX elements in each iteration.

```tsx
import { useState } from 'react';

function PageRenderer({ children }) {
  const [layouts, setLayouts] = useState([RootLayout, DashboardLayout]);

  let page = children;
  layouts.forEach((Layout) => {
    page = <Layout>{page}</Layout>;
  });

  return page;
}
```

--------------------------------

### SolidJS createStore for Syncing External Stores (Observer Pattern)

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

This snippet demonstrates how to synchronize an external vanilla JavaScript store (ToastManager) with a SolidJS `createStore` using the observer pattern. It subscribes to changes in the external store and updates the Solid store reactively.

```tsx
import { createStore, reconcile } from 'solid-js/store';
import { onMount, onCleanup } from 'solid-js';
import { For } from 'solid-js';

// External vanilla JS store
class ToastManager {
  listeners = [];

  subscribe(fn) {
    this.listeners.push(fn);
    return () => {
      this.listeners = this.listeners.filter(l => l !== fn);
    };
  }

  notify(toast) {
    this.listeners.forEach(fn => fn(toast));
  }
}

const toastManager = new ToastManager();

function ToastContainer() {
  const [state, setState] = createStore({ toasts: [] });

  onMount(() => {
    const unsubscribe = toastManager.subscribe((toast) => {
      if (toast.dismiss) {
        setState('toasts', t => t.filter(item => item.id !== toast.id));
        return;
      }

      const exists = state.toasts.find(t => t.id === toast.id);
      if (exists) {
        // Update existing toast
        setState('toasts', t => t.id === toast.id, reconcile(toast));
      } else {
        // Add new toast
        setState('toasts', toasts => [toast, ...toasts]);
      }
    });

    onCleanup(unsubscribe);
  });

  return (
    <For each={state.toasts}>{(toast) =>
      <div class="toast">{toast.message}</div>
    }</For>
  );
}
```

--------------------------------

### SolidJS Dynamic Layout Rendering with Switch/Match

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Presents an alternative method for dynamic layout rendering in SolidJS using `Switch` and `Match` for recursive component wrapping. This pattern allows for conditional rendering and dynamic updates to the layout structure, managed via `createStore`.

```tsx
import { Switch, Match, JSX } from 'solid-js';
import { createStore } from 'solid-js/store';

const WrapWithLayouts = (props: {
  layouts: any[],
  children: JSX.Element,
  index: number
}) => {
  return (
    <Switch fallback={props.children}>
      <Match when={props.index < props.layouts.length}>
        {(() => {
          const CurrentLayout = props.layouts[props.index];
          return (
            <CurrentLayout>
              <WrapWithLayouts
                layouts={props.layouts}
                index={props.index + 1}
              >
                {props.children}
              </WrapWithLayouts>
            </CurrentLayout>
          );
        })()}
      </Match>
    </Switch>
  );
};

function DynamicLayoutPage() {
  const [layouts, setLayouts] = createStore([
    RootLayout,
    DashboardLayout
  ]);

  // Can dynamically update layouts
  const addLayout = () => {
    setLayouts([...layouts, SettingsLayout]);
  };

  return (
    <>
      <button onClick={addLayout}>Add Layout</button>
      <WrapWithLayouts layouts={layouts} index={0}>
        <div>Page Content</div>
      </WrapWithLayouts>
    </>
  );
}
```

--------------------------------

### Solid vs React: Callback Stability and Memoization

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Illustrates how Solid's component model naturally provides stable functions, making `useCallback` unnecessary for preventing re-creation across renders, unlike in React. It also shows how `createMemo` is used in Solid for expensive derived computations.

```tsx
// React: Functions recreated on every render
function SearchBox() {
  const [query, setQuery] = useState('');
  const [results, setResults] = useState([]);

  // ❌ New function instance on every render
  const handleChange = (e) => {
    setQuery(e.target.value);
  };

  // ✅ Stable function reference
  const handleChangeStable = useCallback((e) => {
    setQuery(e.target.value);
  }, []); // Empty deps since setQuery is stable

  const handleSearch = useCallback(async () => {
    const data = await fetch(`/api?q=${query}`);
    setResults(await data.json());
  }, [query]); // Re-created when query changes

  return (
    <div>
      <input onChange={handleChangeStable} />
      <button onClick={handleSearch}>Search</button>
      <ExpensiveChild onSearch={handleSearch} />
    </div>
  );
}
```

```tsx
// Solid: Functions are stable by default
function SearchBox() {
  const [query, setQuery] = createSignal('');
  const [results, setResults] = createSignal([]);

  // ✅ Created once, naturally stable
  const handleChange = (e) => {
    setQuery(e.target.value);
  };

  // ✅ Created once, accesses current signal value when called
  const handleSearch = async () => {
    const data = await fetch(`/api?q=${query()}`);
    setResults(await data.json());
  };

  return (
    <div>
      <input onInput={handleChange} />
      <button onClick={handleSearch}>Search</button>
      <ExpensiveChild onSearch={handleSearch} />
    </div>
  );
}

// When you DO need memoization: expensive derived values
import { createMemo } from 'solid-js';

function DataProcessor() {
  const [data, setData] = createSignal([/* large array */]);

  // ✅ Memoize expensive computation, not the function
  const processedData = createMemo(() => {
    return data().map(/* expensive transform */).filter(/* complex logic */);
  });

  return <div>{processedData().length} items processed</div>;
}
```

--------------------------------

### SolidJS createStore for Complex State Management

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

This snippet shows how to manage complex state in SolidJS using `createStore`. It replaces the reducer pattern with action functions that directly mutate the store using Immer-like proxy-based updates, offering fine-grained reactivity.

```tsx
import { createStore } from 'solid-js/store';
import { For } from 'solid-js';

function App() {
  const [state, setState] = createStore({
    user: { name: 'John', age: 30 },
    todos: [
      { id: 1, text: 'Task 1', completed: false }
    ],
    settings: { theme: 'dark', notifications: true }
  });

  // Define actions as functions that mutate the store
  const actions = {
    updateUser: (updates) => {
      setState('user', updates);
    },

    toggleTodo: (id) => {
      setState('todos', t => t.id === id, 'completed', c => !c);
    },

    addTodo: (text) => {
      setState('todos', todos => [...todos, {
        id: Date.now(),
        text,
        completed: false
      }]);
    },

    updateSettings: (key, value) => {
      setState('settings', key, value);
    }
  };

  return (
    <div>
      <p>{state.user.name}</p>
      <button onClick={() => actions.updateUser({ name: 'Jane' })}>
        Update Name
      </button>
      <For each={state.todos}>{(todo) =>
        <div onClick={() => actions.toggleTodo(todo.id)}>
          {todo.text} - {todo.completed ? '✓' : '○'}
        </div>
      }</For>
    </div>
  );
}
```

--------------------------------

### Solid vs React: Props Destructuring and Reactivity

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Demonstrates the correct way to access props in Solid.js components to maintain reactivity, contrasting it with React where destructuring is safe. Incorrect destructuring in Solid freezes prop values.

```tsx
// React: Props are just values, destructuring is safe
function Child({ count, name }) {
  return <div>{count} - {name}</div>;
}

// Solid: WRONG - Destructuring kills reactivity
function Child(props) {
  const { count, name } = props; // ❌ Values frozen at creation
  return <div>{count} - {name}</div>; // Will never update
}

// Solid: CORRECT - Access props dynamically
function Child(props) {
  return <div>{props.count} - {props.name}</div>; // ✅ Updates work
}
```

--------------------------------

### Solid vs React: Reactive Media Query Hooks

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Compares a React `useMediaQuery` hook that takes a string query with a Solid.js `useMediaQuery` hook that accepts a reactive accessor (string or function) for dynamic query updates. The Solid version utilizes `createSignal` and `createEffect` for reactivity.

```tsx
// React hook: Takes string value
function useMediaQuery(query: string): boolean {
  const [matches, setMatches] = useState(false);

  useEffect(() => {
    const mq = window.matchMedia(query);
    setMatches(mq.matches);
    const listener = (e) => setMatches(e.matches);
    mq.addEventListener('change', listener);
    return () => mq.removeEventListener('change', listener);
  }, [query]);

  return matches;
}

// Usage: Hook re-runs when query changes
const isDesktop = useMediaQuery('(min-width: 768px)');
```

```tsx
// Solid hook: Takes Accessor for reactive updates
import { Accessor, createSignal, createEffect, onCleanup } from 'solid-js';

function useMediaQuery(query: Accessor<string> | string) {
  const getQuery = () => typeof query === 'function' ? query() : query;
  const [matches, setMatches] = createSignal(false);

  createEffect(() => {
    const q = getQuery(); // Tracks signal if provided
    const mq = window.matchMedia(q);
    setMatches(mq.matches);

    const listener = (e) => setMatches(e.matches);
    mq.addEventListener('change', listener);
    onCleanup(() => mq.removeEventListener('change', listener));
  });

  return matches;
}

// Usage: Pass signal for reactive updates
const [query, setQuery] = createSignal('(min-width: 768px)');
const isDesktop = useMediaQuery(query);

// Later: setQuery('(min-width: 1024px)') automatically updates isDesktop
```

--------------------------------

### Implementing Signal-Based Refs for Click Outside Handling in SolidJS

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Shows how to create a custom hook `useClickOutside` in SolidJS that uses `createSignal` for managing a ref and `createEffect` to attach a global event listener. This allows detecting clicks outside of a referenced element for callback execution.

```tsx
import { createSignal, createEffect, onCleanup } from 'solid-js';

function useClickOutside(handler) {
  const [ref, setRef] = createSignal();

  createEffect(() => {
    const listener = (event) => {
      if (ref() && !ref().contains(event.target)) {
        handler();
      }
    };

    document.addEventListener('mousedown', listener);
    onCleanup(() => document.removeEventListener('mousedown', listener));
  });

  return setRef; // Use as ref={setRef}
}
```

--------------------------------

### Measure DOM Element Height in React and SolidJS

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Compares how to measure the height of a DOM element using `useRef` and `useLayoutEffect` in React, and plain variables with `createEffect` in SolidJS. Both examples attach a ref to a div and update its height measurement.

```tsx
import { useRef, useLayoutEffect, useState } from 'react';

function MeasureElement() {
  const divRef = useRef(null);
  const [height, setHeight] = useState(0);

  useLayoutEffect(() => {
    if (divRef.current) {
      const { height } = divRef.current.getBoundingClientRect();
      setHeight(height);
    }
  }, []);

  return (
    <div>
      <div ref={divRef}>Content to measure</div>
      <p>Height: {height}px</p>
    </div>
  );
}
```

```tsx
import { createSignal, createEffect } from 'solid-js';

function MeasureElement() {
  let divRef;
  const [height, setHeight] = createSignal(0);

  createEffect(() => {
    if (divRef) {
      const rect = divRef.getBoundingClientRect();
      setHeight(rect.height);
    }
  });

  return (
    <div>
      <div ref={divRef}>Content to measure</div>
      <p>Height: {height()}px</p>
    </div>
  );
}
```

--------------------------------

### Forwarding and Merging Refs in a Custom Input Component

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Demonstrates how to forward a ref from a parent component to an internal DOM element within a custom component. This allows the parent to access and manipulate the child's DOM node, such as calling focus().

```tsx
function CustomInput(props) {
  let internalRef;

  const handleRef = (el) => {
    internalRef = el; // Keep internal reference
    props.ref?.(el);   // Forward to parent
  };

  const focus = () => internalRef?.focus();

  return <input ref={handleRef} />;
}
```

--------------------------------

### SolidJS Dynamic Layout Rendering with createComponent

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Implements dynamic component composition in SolidJS using functional recursion with `createComponent`. This approach ensures lazy evaluation of children, preventing unnecessary re-renders when layouts are nested or updated. It utilizes `createStore` for managing layout configurations.

```tsx
import { createComponent, JSX } from 'solid-js';
import { createStore } from 'solid-js/store';

function PageRenderer(props: { children: JSX.Element }) {
  const [layouts, setLayouts] = createStore([
    RootLayout,
    DashboardLayout,
    SettingsLayout
  ]);

  function renderLayouts(index: number = 0): JSX.Element {
    const layout = layouts[index];

    // Base case: no more layouts
    if (!layout) return props.children;

    // Recursive case: wrap and continue
    return createComponent(layout, {
      get children(): JSX.Element {
        return renderLayouts(index + 1);
      }
    });
  }

  return <>{renderLayouts(0)}</>;
}
```

--------------------------------

### Force Attribute Binding on Web Components using SolidJS

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Illustrates how to bind attributes to a custom Web Component (`my-element`) using SolidJS's `attr:` prefix. This method ensures that attributes like `data-index`, `aria-label`, and `disabled` are correctly set based on reactive signals.

```tsx
import { createSignal } from 'solid-js';

function WebComponentExample() {
  const [index, setIndex] = createSignal(0);
  const [active, setActive] = createSignal(true);

  return (
    <my-element
      attr:data-index={index()}
      attr:aria-label="Custom element"
      attr:disabled={active() ? undefined : ''}
    />
  );
}
```

--------------------------------

### List Rendering and Reconciliation: React vs. SolidJS

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Compares list rendering in React using map with keys and SolidJS using the For component. Highlights how Solid's createStore with reconcile enables fine-grained updates, preventing full re-renders by tracking data identity, unlike Solid's default For component behavior when not using keys or React's map which can be less performant for large lists.

```tsx
// React: map with key prop
function TodoList() {
  const [todos, setTodos] = useState([
    { id: 1, text: 'Learn React', completed: false },
    { id: 2, text: 'Build app', completed: false }
  ]);

  const toggleTodo = (id) => {
    setTodos(todos.map(todo =>
      todo.id === id ? { ...todo, completed: !todo.completed } : todo
    ));
  };

  return (
    <ul>
      {todos.map(todo => (
        <li key={todo.id}>
          <input
            type="checkbox"
            checked={todo.completed}
            onChange={() => toggleTodo(todo.id)}
          />
          {todo.text}
        </li>
      ))}
    </ul>
  );
}
```

```tsx
// Solid: For component without keys
import { createSignal, For } from 'solid-js';

function TodoList() {
  const [todos, setTodos] = createSignal([
    { id: 1, text: 'Learn Solid', completed: false },
    { id: 2, text: 'Build app', completed: false }
  ]);

  const toggleTodo = (id) => {
    // ⚠️ Creates new array - all DOM nodes recreated!
    setTodos(todos().map(todo =>
      todo.id === id ? { ...todo, completed: !todo.completed } : todo
    ));
  };

  return (
    <ul>
      <For each={todos()}>{(todo, index) =>
        <li>
          <input
            type="checkbox"
            checked={todo.completed}
            onChange={() => toggleTodo(todo.id)}
          />
          {todo.text}
        </li>
      }</For>
    </ul>
  );
}
```

```tsx
// Solid: createStore for fine-grained list updates
import { createStore } from 'solid-js/store';
import { For } from 'solid-js';

function TodoListOptimized() {
  const [state, setState] = createStore({
    todos: [
      { id: 1, text: 'Learn Solid', completed: false },
      { id: 2, text: 'Build app', completed: false }
    ]
  });

  const toggleTodo = (id) => {
    // ✅ Only updates the specific todo's completed property
    setState('todos', todo => todo.id === id, 'completed', c => !c);
  };

  const addTodo = (text) => {
    // ✅ Only appends new item, existing DOM preserved
    setState('todos', todos => [...todos, {
      id: Date.now(),
      text,
      completed: false
    }]);
  };

  return (
    <ul>
      <For each={state.todos}>{(todo) =>
        <li>
          <input
            type="checkbox"
            checked={todo.completed}
            onChange={() => toggleTodo(todo.id)}
          />
          {todo.text}
        </li>
      }</For>
    </ul>
  );
}
```

```tsx
// Advanced: reconcile for bulk API updates
import { createStore, reconcile } from 'solid-js/store';

function LiveFeed() {
  const [state, setState] = createStore({ items: [] });

  const refreshFromAPI = async () => {
    const response = await fetch('/api/items');
    const newItems = await response.json();

    // ✅ Matches by reference/id, preserves unchanged items
    setState('items', reconcile(newItems, { key: 'id' }));
  };

  return <For each={state.items}>{/* ... */}</For>;
}
```

--------------------------------

### Effects and Lifecycle: React useEffect to SolidJS createEffect

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Demonstrates the conversion of React's useEffect hook to SolidJS's createEffect. Solid's createEffect automatically tracks reactive dependencies, eliminating the need for manual dependency arrays. Cleanup is handled with onCleanup, and accessing previous values is integrated into the effect's signature.

```tsx
import { useEffect, useState } from 'react';

function Logger() {
  const [count, setCount] = useState(0);
  const [name, setName] = useState('John');

  useEffect(() => {
    console.log(`Count changed to ${count}`);

    const timer = setInterval(() => {
      console.log('Interval tick');
    }, 1000);

    return () => clearInterval(timer);
  }, [count]); // Must list dependencies or get stale closures

  return <button onClick={() => setCount(count + 1)}>Click</button>;
}
```

```tsx
import { createSignal, createEffect, onCleanup } from 'solid-js';

function Logger() {
  const [count, setCount] = createSignal(0);
  const [name, setName] = createSignal('John');

  createEffect(() => {
    console.log(`Count changed to ${count()}`);
    // Automatically tracks count(), not name()

    const timer = setInterval(() => {
      console.log('Interval tick');
    }, 1000);

    onCleanup(() => clearInterval(timer));
  });

  return <button onClick={() => setCount(count() + 1)}>Click</button>;
}
```

```tsx
// Accessing previous values with effect arguments
import { createEffect } from 'solid-js';

function PreviousValueTracker() {
  const [count, setCount] = createSignal(0);

  createEffect((prevCount) => {
    const current = count();
    if (prevCount !== undefined) {
      console.log(`Changed from ${prevCount} to ${current}`);
    }
    return current; // Becomes prevCount in next run
  }, 0); // Initial value

  return <button onClick={() => setCount(c => c + 1)}>Increment</button>;
}
```

```tsx
// Explicit dependencies with 'on' helper
import { on, createEffect } from 'solid-js';

function ExplicitTracking() {
  const [count, setCount] = createSignal(0);
  const [enabled, setEnabled] = createSignal(true);

  createEffect(on(count, (currentCount) => {
    // Only tracks count, not enabled
    if (enabled()) { // Reading enabled() here doesn't track it
      console.log('Count:', currentCount);
    }
  }));
}
```

--------------------------------

### Convert React useCounter Hook to SolidJS useCounter

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

This snippet shows the conversion of a React 'useCounter' hook to SolidJS. It highlights the replacement of 'useState' with 'createSignal', the removal of 'useCallback', and the simplified dependency management in SolidJS. The 'clamp' utility function remains similar across both implementations.

```tsx
// React: useCounter with callbacks and deps
import { useState, useCallback } from 'react';

interface UseCounterOptions {
  min?: number;
  max?: number;
}

function clamp(value: number, min?: number, max?: number): number {
  if (min !== undefined && value < min) return min;
  if (max !== undefined && value > max) return max;
  return value;
}

export function useCounter( 
  initialValue = 0,
  options?: UseCounterOptions
): [number, UseCounterHandlers] {
  const { min, max } = options || {};
  const [count, setCount] = useState(clamp(initialValue, min, max));

  const increment = useCallback(
    () => setCount(current => clamp(current + 1, min, max)),
    [min, max]
  );

  const decrement = useCallback(
    () => setCount(current => clamp(current - 1, min, max)),
    [min, max]
  );

  const set = useCallback(
    (value: number) => setCount(clamp(value, min, max)),
    [min, max]
  );

  const reset = useCallback(
    () => setCount(clamp(initialValue, min, max)),
    [initialValue, min, max]
  );

  return [count, { increment, decrement, set, reset }];
}

// Usage
function CounterDemo() {
  const [count, { increment, decrement, set, reset }] = useCounter(0, {
    min: 0,
    max: 10
  });

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={increment}>+</button>
      <button onClick={decrement}>-</button>
      <button onClick={() => set(5)}>Set to 5</button>
      <button onClick={reset}>Reset</button>
    </div>
  );
}

```

```tsx
// Solid: useCounter simplified
import { createSignal } from 'solid-js';

function clamp(value: number, min?: number, max?: number): number {
  if (min !== undefined && value < min) return min;
  if (max !== undefined && value > max) return max;
  return value;
}

export function useCounter(
  initialValue = 0,
  options: Partial<{ min: number; max: number }> = {}
) {
  const [count, setCount] = createSignal(
    clamp(initialValue, options.min, options.max)
  );

  // No useCallback needed - functions are stable
  const increment = () =>
    setCount(c => clamp(c + 1, options.min, options.max));

  const decrement = () =>
    setCount(c => clamp(c - 1, options.min, options.max));

  const set = (value: number) =>
    setCount(clamp(value, options.min, options.max));

  const reset = () =>
    setCount(clamp(initialValue, options.min, options.max));

  return [count, { increment, decrement, set, reset }] as const;
}

// Usage
function CounterDemo() {
  const [count, { increment, decrement, set, reset }] = useCounter(0, {
    min: 0,
    max: 10
  });

  return (
    <div>
      <p>Count: {count()}</p>
      <button onClick={increment}>+</button>
      <button onClick={decrement}>-</button>
      <button onClick={() => set(5)}>Set to 5</button>
      <button onClick={reset}>Reset</button>
    </div>
  );
}

```

--------------------------------

### Non-Reactive State: React useRef vs. SolidJS Variables

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Demonstrates managing non-reactive state in SolidJS using plain variables (let/const) as an alternative to React's useRef. This approach is suitable for values like timers, flags, or previous states that do not require re-renders upon change and leverage Solid's component execution model where variables persist across renders.

```tsx
// React: useRef to persist values across renders
function Timer() {
  const intervalRef = useRef(null);
  const countRef = useRef(0);

  useEffect(() => {
    intervalRef.current = setInterval(() => {
      countRef.current += 1;
      console.log('Tick:', countRef.current);
    }, 1000);

    return () => clearInterval(intervalRef.current);
  }, []);

  return <div>Check console</div>;
}
```

```tsx
// Solid: Plain variables
import { onMount, onCleanup } from 'solid-js';

function Timer() {
  let intervalId;
  let count = 0;

  onMount(() => {
    intervalId = setInterval(() => {
      count += 1;
      console.log('Tick:', count);
    }, 1000);
  });

  onCleanup(() => {
    clearInterval(intervalId);
  });

  return <div>Check console</div>;
}
```

```tsx
// Debounce pattern with plain variables
function SearchInput() {
  let timeoutId;
  const [query, setQuery] = createSignal('');

  const handleInput = (e) => {
    clearTimeout(timeoutId);
    timeoutId = setTimeout(() => {
      setQuery(e.target.value);
    }, 300);
  };

  return <input onInput={handleInput} />;
}
```

```tsx
// Tracking previous scroll position
function ScrollTracker() {
  let lastScrollTop = 0;

  const handleScroll = (e) => {
    const scrollTop = e.target.scrollTop;
    const direction = scrollTop > lastScrollTop ? 'down' : 'up';
    console.log('Scrolling', direction);
    lastScrollTop = scrollTop;
  };

  return <div onScroll={handleScroll}>Content</div>;
}
```

--------------------------------

### Solid: Using Accessors for Reactive Hooks

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/props-and-accessors.md

When porting hooks from React to Solid, Solid hooks often accept Accessors (functions that return a value) instead of direct values. This allows the hook to re-run when the underlying signal changes. This example demonstrates passing a signal (Accessor) to a Solid hook.

```tsx
// Solid Hook
// useMediaQuery(query: Accessor<string> | string)
const [query, setQuery] = createSignal('(min-width: 768px)');
const matches = useMediaQuery(query); // Pass the signal!
```

--------------------------------

### State Management: React useState to SolidJS createSignal

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

Compares React's useState hook with SolidJS's createSignal for managing component state. Solid's signals offer fine-grained reactivity, updating only dependent UI parts without re-rendering the entire component. This snippet also shows how to create global signals in Solid.

```tsx
import { useState } from 'react';

function Counter() {
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={() => setCount(count + 1)}>Increment</button>
      <button onClick={() => setCount(c => c - 1)}>Decrement</button>
    </div>
  );
}
```

```tsx
import { createSignal } from 'solid-js';

function Counter() {
  const [count, setCount] = createSignal(0);

  return (
    <div>
      <p>Count: {count()}</p>
      <button onClick={() => setCount(count() + 1)}>Increment</button>
      <button onClick={() => setCount(c => c - 1)}>Decrement</button>
    </div>
  );
}
```

```tsx
// Solid signals can be global without extra libraries
const [globalCount, setGlobalCount] = createSignal(0);

export function useGlobalCounter() {
  return [globalCount, setGlobalCount];
}
```

--------------------------------

### SolidJS: Persist Values Across Component Lifecycle with `let`

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/non-reactive-state.md

SolidJS components execute their setup function only once. Therefore, standard JavaScript `let` variables declared within the component scope persist for the entire lifecycle of the component. This makes them suitable for managing values like interval IDs without needing a special hook.

```tsx
import { onMount, onCleanup } from 'solid-js';

function Timer() {
  let intervalId;

  onMount(() => {
    intervalId = setInterval(() => {
      // Timer logic
    }, 1000);
  });

  onCleanup(() => {
    clearInterval(intervalId);
  });

  return <div>Timer component</div>;
}
```

--------------------------------

### Implement useMediaQuery Hook in SolidJS

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/examples/subscriptions.md

The SolidJS implementation of the useMediaQuery hook accepts a query as an Accessor, enabling dynamic query updates. It utilizes `createSignal` for state management and `createEffect` for reactive updates, returning the match signal itself for consumer tracking.

```typescript
import { Accessor, createEffect, createSignal } from 'solid-js';

export function useMediaQuery(
  query: Accessor<string>, // Accepts an Accessor!
  // ... options
) {
  const [matches, setMatches] = createSignal(getInitialValue(query()));

  let queryRef: MediaQueryList;

  createEffect(() => {
    // Calling query() tracks it. 
    // If the signal passed to query updates, this effect re-runs.
    if ('matchMedia' in window) {
      queryRef = window.matchMedia(query());
      setMatches(queryRef.matches);
      
      const listener = event => setMatches(event.matches);
      queryRef.addEventListener('change', listener);
      
      // Cleanup happens automatically before next run or unmount
      onCleanup(() => queryRef.removeEventListener('change', listener));
    }
  });

  return matches; // Return the signal (Accessor), not the value!
```

--------------------------------

### React: Passing Simple Values as Props

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/props-and-accessors.md

In React, props are passed as simple values. When the parent re-renders, the child component re-renders with the updated value. This example shows a basic child component receiving a 'count' prop.

```tsx
// React
function Child({ count }) {
  // 'count' is a number. 
  // When parent re-renders, Child re-renders with new number.
  return <div>{count}</div>;
}
```

--------------------------------

### Implement useMediaQuery Hook in React

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/examples/subscriptions.md

The React implementation of the useMediaQuery hook listens to changes in a media query string and returns a boolean indicating whether the query matches. It uses `useState` for the match state and `useEffect` to set up and clean up the event listener.

```typescript
export function useMediaQuery(
  query: string,
  // ... options
): boolean {
  const [matches, setMatches] = useState(getInitialValue(query));
  
  useEffect(() => {
    const mediaQuery = window.matchMedia(query);
    setMatches(mediaQuery.matches);
    
    const listener = (event) => setMatches(event.matches);
    mediaQuery.addEventListener('change', listener);
    return () => mediaQuery.removeEventListener('change', listener);
  }, [query]); // Re-runs if query string changes

  return matches;
}
```

--------------------------------

### React useReducer for Complex State Management

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

This snippet illustrates the traditional approach to managing complex, nested state in React using the `useReducer` hook. It defines an initial state and a reducer function to handle different action types for updating the state.

```tsx
import { useReducer } from 'react';

const initialState = {
  user: { name: 'John', age: 30 },
  todos: [
    { id: 1, text: 'Task 1', completed: false }
  ],
  settings: { theme: 'dark', notifications: true }
};

function reducer(state, action) {
  switch (action.type) {
    case 'UPDATE_USER':
      return { ...state, user: { ...state.user, ...action.payload } };
    case 'TOGGLE_TODO':
      return {
        ...state,
        todos: state.todos.map(todo =>
          todo.id === action.id
            ? { ...todo, completed: !todo.completed }
            : todo
        )
      };
    case 'ADD_TODO':
      return { ...state, todos: [...state.todos, action.todo] };
    default:
      return state;
  }
}

function App() {
  const [state, dispatch] = useReducer(reducer, initialState);

  return (
    <div>
      <button onClick={() => dispatch({
        type: 'UPDATE_USER',
        payload: { name: 'Jane' }
      })}>
        Update Name
      </button>
    </div>
  );
}
```

--------------------------------

### Solid.js Syncing External State with createStore and reconcile

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/stores-vs-reducers.md

Illustrates syncing an external vanilla JavaScript observable store with a Solid.js `createStore`. It uses `reconcile` for efficient updates and demonstrates handling add/update and dismiss events for a toast manager.

```tsx
import { createStore, reconcile } from 'solid-js/store';
import { ToastState } from './external-state'; // The vanilla JS observer

const [state, setState] = createStore({ toasts: [] });

onMount(() => {
  // Subscribe to the external vanilla JS store
  const unsubscribe = ToastState.subscribe((toast) => {
    // 1. Handle specialized events (like dismiss)
    if (toast.dismiss) {
      setState("toasts", (t) => t.filter(item => item.id !== toast.id));
      return;
    }

    // 2. Handle Add/Update
    // If the toast already exists, update it deeply.
    // If not, prepend it.
    const exists = state.toasts.find(t => t.id === toast.id);
    if (exists) {
      // Solid's reconcile or path syntax handles the merge seamlessly
      setState("toasts", (t) => t.id === toast.id, reconcile(toast));
    } else {
      setState("toasts", (t) => [toast, ...t]);
    }
  });

  onCleanup(unsubscribe);
});
```

--------------------------------

### Solid.js Replacing useReducer with Store Actions

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/stores-vs-reducers.md

Demonstrates how to replace the boilerplate of `useReducer`'s switch statements in Solid.js by defining direct mutation functions on the store. This achieves separation of concerns with less code.

```tsx
const [state, _setState] = createStore({ count: 0 });

const actions = {
  increment: () => _setState("count", (c) => c + 1),
  decrement: () => _setState("count", (c) => c - 1),
};
```

--------------------------------

### Callback Memoization in React vs. Solid

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/callbacks-and-stability.md

Compares the pattern for memoizing callbacks in React using `useCallback` with its dependency array, versus the SolidJS approach where no explicit memoization hook is needed due to stable function references.

```tsx
const handleChange = useCallback((event) => {
  setValue(event.target.value);
}, []); // Dependency array needed
```

```tsx
// No hook needed. Accessing state (signals) works because 
// signals are stable references with dynamic values.
const handleChange = (event) => {
  setValue(event.target.value);
};
```

--------------------------------

### React useState Initialization

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/state-vs-signals.md

Demonstrates how to initialize state in React using the useState hook. The initial value is directly assigned to the state variable.

```tsx
const [count, setCount] = useState(0);
// count is the value (0)
```

--------------------------------

### Debounced Value Hook: React vs. SolidJS

Source: https://context7.com/blankeos/react-to-solid-llms/llms.txt

This snippet demonstrates the implementation of a `useDebouncedValue` hook in both React and SolidJS. It shows how to manage debounced state updates, converting `useRef` in React to plain variables in SolidJS for better performance. The hook accepts a value and a wait time, returning the debounced value and a cancel function.

```typescript
import { useState, useEffect, useRef } from 'react';

export function useDebouncedValue<T>(
  value: T,
  wait: number,
  options = { leading: false }
): [T, () => void] {
  const [_value, setValue] = useState(value);
  const timeoutRef = useRef<number | null>(null);
  const cooldownRef = useRef(false);
  const mountedRef = useRef(false);

  useEffect(() => {
    mountedRef.current = true;
    return () => { mountedRef.current = false; };
  }, []);

  const cancel = () => {
    if (timeoutRef.current) {
      window.clearTimeout(timeoutRef.current);
    }
  };

  useEffect(() => {
    if (mountedRef.current) {
      if (!cooldownRef.current && options.leading) {
        cooldownRef.current = true;
        setValue(value);
      } else {
        cancel();
        timeoutRef.current = window.setTimeout(() => {
          cooldownRef.current = false;
          setValue(value);
        }, wait);
      }
    }
  }, [value, options.leading, wait]);

  return [_value, cancel];
}

// Usage
function SearchWithDebounce() {
  const [query, setQuery] = useState('');
  const [debouncedQuery, cancel] = useDebouncedValue(query, 500);

  useEffect(() => {
    if (debouncedQuery) {
      fetch(`/api/search?q=${debouncedQuery}`)
        .then(r => r.json())
        .then(results => console.log(results));
    }
  }, [debouncedQuery]);

  return (
    <div>
      <input
        value={query}
        onChange={e => setQuery(e.target.value)}
      />
      <button onClick={cancel}>Cancel</button>
    </div>
  );
}

```

```typescript
import { Accessor, createEffect, createSignal, on } from 'solid-js';

export function useDebouncedValue<T>(
  value: Accessor<T>,
  wait: number,
  options = { leading: false }
) {
  const [_value, setValue] = createSignal<T>(value());

  // Plain variables instead of useRef
  let timeoutRef: number | null = null;
  let cooldownRef = false;

  const cancel = () => {
    if (timeoutRef) window.clearTimeout(timeoutRef);
  };

  // Explicit tracking with 'on'
  createEffect(
    on(value, () => {
      if (!cooldownRef && options.leading) {
        cooldownRef = true;
        setValue(() => value());
      } else {
        cancel();
        timeoutRef = window.setTimeout(() => {
          cooldownRef = false;
          setValue(() => value());
        }, wait);
      }
    })
  );

  return [_value, cancel] as const;
}

// Usage
function SearchWithDebounce() {
  const [query, setQuery] = createSignal('');
  const [debouncedQuery, cancel] = useDebouncedValue(query, 500);

  createEffect(() => {
    const q = debouncedQuery();
    if (q) {
      fetch(`/api/search?q=${q}`)
        .then(r => r.json())
        .then(results => console.log(results));
    }
  });

  return (
    <div>
      <input
        value={query()}
        onInput={e => setQuery(e.currentTarget.value)}
      />
      <button onClick={cancel}>Cancel</button>
    </div>
  );
}

```

--------------------------------

### Implement useClickOutside Hook in React

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/examples/event-listeners.md

The React implementation of the useClickOutside hook uses `useRef` to manage the DOM element reference and `useEffect` for event listener setup and cleanup. It attaches event listeners to the document and invokes a callback when a click occurs outside the referenced element. Dependencies for the effect include the ref, callback, and optional nodes.

```typescript
import { useEffect, useRef } from 'react';

export function useClickOutside<T extends HTMLElement = any>(
  callback: (event: EventType) => void,
  events?: string[] | null,
  nodes?: (HTMLElement | null)[]
) {
  const ref = useRef<T>(null);
  const eventsList = events || DEFAULT_EVENTS;

  useEffect(() => {
    const listener = (event: Event) => {
      // ... logic ...
      if (ref.current && !ref.current.contains(target as Node)) {
        callback(event as EventType);
      }
    };

    eventsList.forEach((fn) => document.addEventListener(fn, listener));

    // Cleanup returned from effect
    return () => {
      eventsList.forEach((fn) => document.removeEventListener(fn, listener));
    };
  }, [ref, callback, nodes]); // Dependencies trigger re-bind

  return ref;
}
```

--------------------------------

### Solid Composable Refs via Callback Functions

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/refs-and-dom.md

Solid's ref system, using callback functions, allows for easy composition. A single ref callback can manage both internal state and forward the ref to a parent.

```tsx
let internalRef;

const handleRef = (el) => {
  internalRef = el; // Keep a local reference if needed
  // props.ref?.(el); // Forward to parent if parent passed a ref callback
};

// Usage in JSX:
<div ref={handleRef} />;
// Access internalRef directly within the component or use the forwarded ref
```

--------------------------------

### Solid: Implementing a Hook with Accessor Input

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/props-and-accessors.md

This TypeScript code demonstrates a Solid hook implementation that accepts either a direct string value or an Accessor<string>. It uses `createEffect` to track changes by calling the Accessor if provided, ensuring reactivity.

```typescript
import { Accessor, createEffect } from 'solid-js';

// Solid implementation
function useSomething(value: Accessor<string> | string) {
  const getValue = () => typeof value === 'function' ? (value as Accessor<string>)() : value;
  
  createEffect(() => {
    console.log(getValue()); // Tracks changes!
  });
}
```

--------------------------------

### Solid.js Nested State Update with createStore

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/stores-vs-reducers.md

Shows how to update nested state in Solid.js using `createStore`. The proxy-based API allows for direct-like mutation syntax, simplifying updates and leveraging fine-grained reactivity.

```tsx
import { createStore } from "solid-js/store";

const [state, setState] = createStore({
  todos: [{ id: 1, text: "Learn Solid", completed: false }],
});

// "Mutate" deeply using path syntax
const toggleTodo = (id) => {
  setState(
    "todos",
    (todo) => todo.id === id,
    "completed",
    (c) => !c,
  );
};
```

--------------------------------

### SolidJS createSignal Initialization

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/state-vs-signals.md

Illustrates state initialization in SolidJS using createSignal. The state is accessed via a getter function, and it can live outside the component render cycle.

```tsx
const [count, setCount] = createSignal(0);
// count is a GETTER function (() => 0)
```

--------------------------------

### SolidJS: Switch/Match Recursion for Dynamic Wrapping

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/functional-recursion.md

Simulates dynamic component wrapping and recursion in SolidJS using the `Switch` and `Match` components. This provides a way to handle conditional rendering that mimics early returns.

```typescript
import { Switch, Match, JSX } from "solid-js";
import { createStore } from "solid-js/store";

// Helper component that handles wrapping using Switch/Match
const WrapWithLayouts = (props: { layouts: any[], children: JSX.Element, index: number }) => {
  return (
    <Switch fallback={props.children}>
      <Match when={props.index < props.layouts.length}>
        {(() => {
          const CurrentComponent = props.layouts[props.index];
          return (
            <CurrentComponent>
              <WrapWithLayouts layouts={props.layouts} index={props.index + 1}>
                {props.children}
              </WrapWithLayouts>
            </CurrentComponent>
          );
        })()}
      </Match>
    </Switch>
  );
};
 
function PageRenderer() {
  const [layouts, setLayouts] = createStore([
    RootLayout,
    DashboardLayout,
  ]);
 
  return <WrapWithLayouts layouts={layouts} index={0}>I am page</WrapWithLayouts>
}
```

--------------------------------

### DOM Measurement with Solid's createEffect

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/refs-and-dom.md

Solid's `createEffect` runs after the DOM update paint, which is generally sufficient for most DOM measurement needs. It accesses the ref directly.

```tsx
import { createEffect, createSignal } from 'solid-js';

let ref;
const [measurement, setMeasurement] = createSignal(0);

createEffect(() => {
  // This runs after the DOM has updated
  if (ref) {
    const { height } = ref.getBoundingClientRect();
    setMeasurement(height);
  }
});

// ... render the element with ref={ref}
```

--------------------------------

### React State Management with useState and useReducer

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/stores-vs-reducers.md

Demonstrates common patterns in React for managing nested state using `useState` with shallow copying or `useReducer`. This approach can become verbose and error-prone with complex state structures.

```tsx
const [state, dispatch] = useReducer(reducer, {
  count: 0,
  user: { name: "John" },
});
// or
setUser({ ...user, name: "Jane" });
```

--------------------------------

### React: Dynamic Component Wrapping with Looping

Source: https://github.com/blankeos/react-to-solid-llms/blob/main/concepts/functional-recursion.md

Demonstrates how to dynamically wrap children components in React by iterating through a list of layouts. This works due to React's component re-composition model.

```tsx
import React, { useState, PropsWithChildren } from 'react';

function PageRenderer(props: PropsWithChildren<any>) {
  const [layouts, setLayouts] = useState([RootLayout, DashboardLayout]);
 
  let page = props.children;
  layouts.forEach((Layout) => {
    page = <Layout>{page}</Layout>; // You just need to keep wrapping page with the Layout.
  });
 
  return page;
}
```