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Oct 22, 2025
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Sync svelte docs #1630

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9 changes: 2 additions & 7 deletions apps/svelte.dev/content/docs/svelte/02-runes/07-$inspect.md
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Expand Up @@ -19,6 +19,8 @@ The `$inspect` rune is roughly equivalent to `console.log`, with the exception t
<input bind:value={message} />
```

On updates, a stack trace will be printed, making it easy to find the origin of a state change (unless you're in the playground, due to technical limitations).

## $inspect(...).with

`$inspect` returns a property `with`, which you can invoke with a callback, which will then be invoked instead of `console.log`. The first argument to the callback is either `"init"` or `"update"`; subsequent arguments are the values passed to `$inspect` ([demo](/playground/untitled#H4sIAAAAAAAACkVQ24qDMBD9lSEUqlTqPlsj7ON-w7pQG8c2VCchmVSK-O-bKMs-DefKYRYx6BG9qL4XQd2EohKf1opC8Nsm4F84MkbsTXAqMbVXTltuWmp5RAZlAjFIOHjuGLOP_BKVqB00eYuKs82Qn2fNjyxLtcWeyUE2sCRry3qATQIpJRyD7WPVMf9TW-7xFu53dBcoSzAOrsqQNyOe2XUKr0Xi5kcMvdDB2wSYO-I9vKazplV1-T-d6ltgNgSG1KjVUy7ZtmdbdjqtzRcphxMS1-XubOITJtPrQWMvKnYB15_1F7KKadA_AQAA)):
Expand All @@ -37,13 +39,6 @@ The `$inspect` rune is roughly equivalent to `console.log`, with the exception t
<button onclick={() => count++}>Increment</button>
```

A convenient way to find the origin of some change is to pass `console.trace` to `with`:

```js
// @errors: 2304
$inspect(stuff).with(console.trace);
```

## $inspect.trace(...)

This rune, added in 5.14, causes the surrounding function to be _traced_ in development. Any time the function re-runs as part of an [effect]($effect) or a [derived]($derived), information will be printed to the console about which pieces of reactive state caused the effect to fire.
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