routie dev init since i didn't adhere to any proper guidance up until now

frontend/node_modules/eslint-plugin-unicorn/rules/prefer-dom-node-append.js

@@ -0,0 +1,50 @@
+import {isMethodCall} from './ast/index.js';
+import {isNodeValueNotDomNode, isValueNotUsable} from './utils/index.js';
+
+const MESSAGE_ID = 'prefer-dom-node-append';
+const messages = {
+	[MESSAGE_ID]: 'Prefer `Node#append()` over `Node#appendChild()`.',
+};
+
+/** @param {import('eslint').Rule.RuleContext} context */
+const create = context => {
+	context.on('CallExpression', node => {
+		if (
+			!isMethodCall(node, {
+				method: 'appendChild',
+				argumentsLength: 1,
+				optionalCall: false,
+			})
+			|| isNodeValueNotDomNode(node.callee.object)
+			|| isNodeValueNotDomNode(node.arguments[0])
+		) {
+			return;
+		}
+
+		const fix = isValueNotUsable(node)
+			? fixer => fixer.replaceText(node.callee.property, 'append')
+			: undefined;
+
+		return {
+			node,
+			messageId: MESSAGE_ID,
+			fix,
+		};
+	});
+};
+
+/** @type {import('eslint').Rule.RuleModule} */
+const config = {
+	create,
+	meta: {
+		type: 'suggestion',
+		docs: {
+			description: 'Prefer `Node#append()` over `Node#appendChild()`.',
+			recommended: 'unopinionated',
+		},
+		fixable: 'code',
+		messages,
+	},
+};
+
+export default config;