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New Rule: svelte/require-each-key #459

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@baseballyama

Description

@baseballyama

Motivation

This is exactly the same as Vue rule.
https://eslint.vuejs.org/rules/require-v-for-key.html

Description

Require key with {#each} syntax

Examples

<!-- ✓ GOOD -->
{#each items as item (item.id)}
  <li>{item.name} x {item.qty}</li>
{/each}

<!-- ✗ BAD -->
{#each items as item}
  <li>{item.name} x {item.qty}</li>
{/each}

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