require-each-key.ts

import type { AST } from 'svelte-eslint-parser';
import { createRule } from '../utils';

export default createRule('require-each-key', {
	meta: {
		docs: {
			description: 'require keyed `{#each}` block',
			category: 'Best Practices',
			recommended: false
		},
		schema: [],
		messages: { expectedKey: 'Each block should have a key' },
		type: 'suggestion'
	},
	create(context) {
		return {
			SvelteEachBlock(node: AST.SvelteEachBlock) {
				if (node.key == null) {
					context.report({
						node,
						messageId: 'expectedKey'
					});
				}
			}
		};
	}
});