eslint-plugin-svelte/lib/rules/require-each-key.js

ESLint plugin for Svelte using AST

import { createRule } from '../utils/index.js';
export default createRule('require-each-key', {
    meta: {
        docs: {
            description: 'require keyed `{#each}` block',
            category: 'Best Practices',
            recommended: true
        },
        schema: [],
        messages: { expectedKey: 'Each block should have a key' },
        type: 'suggestion'
    },
    create(context) {
        return {
            SvelteEachBlock(node) {
                // No need a `key` if an each blocks without an item
                // see: https://svelte.dev/docs/svelte/each#Each-blocks-without-an-item
                if (node.context != null && node.key == null) {
                    context.report({
                        node,
                        messageId: 'expectedKey'
                    });
                }
            }
        };
    }
});