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{@const ...}

documentation/docs/03-template-syntax/[email protected]

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The {@const ...} tag defines a local constant.

svelte
{#each boxes as box}
	{@const area = box.width * box.height}
	{box.width} * {box.height} = {area}
{/each}

{@const} is only allowed as an immediate child of a block — {#if ...}, {#each ...}, {#snippet ...} and so on — a <Component /> or a <svelte:boundary>.