Solid Agents Review

solid-agents-review

Quick Reference

Run this checklist on EVERY generated SolidJS code block. Each item has a severity level:

• CRITICAL -- Breaks reactivity silently. Code appears to work but updates fail.
• WARNING -- Suboptimal pattern. Works but causes performance issues or maintenance problems.
• INFO -- Style issue. Does not break functionality but violates SolidJS idioms.

1. Signal Access Checks

CRITICAL: Signals MUST be called as functions in JSX and reactive scopes

// WRONG -- signal value read once, never updates
const [count, setCount] = createSignal(0);
return <div>{count}</div>;

// CORRECT -- signal called as function, tracked reactively
return <div>{count()}</div>;

CRITICAL: NEVER store signal results in variables outside reactive scopes

// WRONG -- snapshot, never updates
const value = count();
return <div>{value}</div>;

// CORRECT -- call getter where the value is needed
return <div>{count()}</div>;

CRITICAL: NEVER destructure signal getters from arrays or objects

// WRONG -- extracted once, loses tracking
const currentCount = count();

// CORRECT -- use createMemo for derived state
const doubled = createMemo(() => count() * 2);

WARNING: Use createMemo for derived values, NOT createEffect + setSignal

// WRONG -- unnecessary effect/signal pair
const [doubled, setDoubled] = createSignal(0);
createEffect(() => setDoubled(count() * 2));

// CORRECT -- createMemo caches derived state
const doubled = createMemo(() => count() * 2);

CRITICAL: NEVER access signals conditionally before other signals in effects

// WRONG -- name() not tracked when loading() is true
createEffect(() => {
  if (loading()) return;
  console.log(name());
});

// CORRECT -- access all signals first, then use conditionally
createEffect(() => {
  const isLoading = loading();
  const currentName = name();
  if (isLoading) return;
  console.log(currentName);
});

2. Props Checks

CRITICAL: NEVER destructure props

// WRONG -- kills reactivity
function Greeting({ name }: { name: string }) {
  return <h1>{name}</h1>;
}

// WRONG -- also kills reactivity
function Greeting(props: { name: string }) {
  const { name } = props;
  return <h1>{name}</h1>;
}

// CORRECT -- access props directly
function Greeting(props: { name: string }) {
  return <h1>{props.name}</h1>;
}

WARNING: Use splitProps to separate prop groups reactively

// CORRECT -- preserves reactivity while splitting
const [local, others] = splitProps(props, ["class", "onClick"]);
return <div class={local.class} {...others} />;

WARNING: Use mergeProps for default prop values

// CORRECT -- reactive defaults
const merged = mergeProps({ variant: "primary" }, props);
return <button class={merged.variant}>{props.children}</button>;

WARNING: Use children() helper when manipulating props.children

// WRONG -- may re-create children on each access
const kids = props.children;

// CORRECT -- resolve and cache children
import { children } from "solid-js";
const resolved = children(() => props.children);
return <div>{resolved()}</div>;

3. Control Flow Checks

WARNING: Use <For> instead of Array.map for list rendering

// WRONG -- re-creates all DOM nodes on change
{items().map((item) => <div key={item.id}>{item.name}</div>)}

// CORRECT -- fine-grained updates per item
<For each={items()}>
  {(item) => <div>{item.name}</div>}
</For>

WARNING: Use <Show> instead of ternary for conditional rendering

// WRONG -- can cause unnecessary DOM recreation
{isLoggedIn() ? <Dashboard /> : <Login />}

// CORRECT -- reactive conditional rendering
<Show when={isLoggedIn()} fallback={<Login />}>
  <Dashboard />
</Show>

WARNING: Use <Switch>/<Match> instead of switch statements or chained ternaries

// CORRECT
<Switch fallback={<NotFound />}>
  <Match when={route() === "home"}><Home /></Match>
  <Match when={route() === "about"}><About /></Match>
</Switch>

INFO: NEVER use the key prop -- SolidJS <For> tracks by reference

// WRONG -- key prop is ignored in SolidJS
<For each={items()}>
  {(item) => <div key={item.id}>{item.name}</div>}
</For>

// CORRECT -- no key needed
<For each={items()}>
  {(item) => <div>{item.name}</div>}
</For>

INFO: Use <Index> for arrays of primitives, <For> for arrays of objects

4. Store Checks

CRITICAL: NEVER destructure store properties

// WRONG -- snapshot, loses reactivity
const { username } = store.users[0];

// CORRECT -- access in tracking scope
<span>{store.users[0].username}</span>

CRITICAL: Use setStore path syntax for updates, NEVER spread-replace

// WRONG -- replaces entire state, breaks fine-grained tracking
setStore({ ...store, count: store.count + 1 });

// CORRECT -- surgical path update
setStore("count", (c) => c + 1);
setStore("users", 0, "loggedIn", true);

WARNING: Use produce for complex mutations

// CORRECT -- Immer-style mutations applied immutably
setStore(produce((state) => {
  state.users.push(newUser);
  state.count += 1;
}));

5. Component Checks

CRITICAL: NEVER use early returns for conditional rendering

// WRONG -- component body runs once, early return is permanent
function Profile(props: { user: User | null }) {
  if (!props.user) return <p>Loading...</p>;
  return <div>{props.user.name}</div>;
}

// CORRECT -- use Show for reactive conditional
function Profile(props: { user: User | null }) {
  return (
    <Show when={props.user} fallback={<p>Loading...</p>}>
      {(user) => <div>{user().name}</div>}
    </Show>
  );
}

WARNING: Use correct event binding patterns

// WRONG -- calls handler immediately, assigns return value
<button

// CORRECT -- passes handler reference
<button

// CORRECT -- arrow function for arguments
<button => handleClick(id)}>Click</button>

// CORRECT -- array syntax avoids closure creation
<button id]}>Click</button>

INFO: Use let ref!: HTMLElement for refs, NOT useRef

// CORRECT
let inputRef!: HTMLInputElement;
onMount(() => inputRef.focus());
return <input ref={inputRef} />;

INFO: Declare directives in module scope for TypeScript

declare module "solid-js" {
  namespace JSX {
    interface Directives {
      clickOutside: () => void;
    }
  }
}

6. React Contamination Scan

CRITICAL: Scan for ALL React imports and hooks

NEVER allow these in SolidJS code:

CRITICAL: NEVER use dependency arrays

// WRONG -- dependency arrays are a React concept
createEffect(() => {
  console.log(count());
}, [count]);

// CORRECT -- automatic tracking, no deps
createEffect(() => {
  console.log(count());
});

CRITICAL: NEVER return cleanup from effects

// WRONG -- React cleanup pattern
createEffect(() => {
  const id = setInterval(fn, 1000);
  return () => clearInterval(id);
});

// CORRECT -- use onCleanup
createEffect(() => {
  const id = setInterval(fn, 1000);
  onCleanup(() => clearInterval(id));
});

CRITICAL: NEVER use element={} on Route definitions

// WRONG -- React Router pattern
<Route path="/" element={<Home />} />

// CORRECT -- Solid Router pattern
<Route path="/" component={Home} />

Review Procedure

Execute these checks in order on every generated SolidJS code block:

1. Import scan -- Flag ANY import from react, react-dom, react-router-dom
2. Hook scan -- Flag useState, useEffect, useMemo, useRef, useCallback, useReducer, forwardRef
3. Signal access -- Verify ALL signals are called as functions signal() in JSX
4. Props handling -- Verify NO destructuring of props objects
5. Control flow -- Verify <For>, <Show>, <Switch> used instead of .map(), ternaries, switch statements
6. Store access -- Verify NO destructuring of store properties
7. Store updates -- Verify path syntax used, no spread-replace
8. Early returns -- Verify NO early returns in component bodies for conditional rendering
9. Cleanup -- Verify onCleanup() used, NOT return from effects
10. Dependency arrays -- Verify NO [deps] passed to createEffect/createMemo
11. key prop -- Flag any usage of key={} in JSX
12. Refs -- Verify let ref!: T pattern, NOT useRef

Reference Links

• references/methods.md -- Complete validation checklist organized by area
• references/examples.md -- Review scenarios with good code, bad code, and fixes
• references/anti-patterns.md -- All React contamination patterns consolidated for scanning

Official Sources

• https://docs.solidjs.com/concepts/intro-to-reactivity
• https://docs.solidjs.com/concepts/components/props
• https://docs.solidjs.com/reference/basic-reactivity/create-signal
• https://docs.solidjs.com/reference/basic-reactivity/create-effect
• https://docs.solidjs.com/reference/basic-reactivity/create-memo
• https://docs.solidjs.com/reference/store-utilities/create-store
• https://docs.solidjs.com/reference/components/for
• https://docs.solidjs.com/reference/components/show