Extract rule: template-attribute-order

Author: NullVoxPopuli

docs/rules/template-attribute-order.md

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+# ember/template-attribute-order
+
+💼 This rule is enabled in the following [configs](https://github.com/ember-cli/eslint-plugin-ember#-configurations): `strict-gjs`, `strict-gts`.
+
+<!-- end auto-generated rule header -->
+
+Enforces a consistent ordering of attributes in template elements. This helps improve readability and maintainability of templates.
+
+## Rule Details
+
+This rule enforces a consistent order for attributes on template elements. By default, it follows this order:
+
+1. `class`
+2. `id`
+3. `role`
+4. `aria-*` attributes
+5. `data-test-*` attributes
+6. `type`
+7. `name`
+8. `value`
+9. `placeholder`
+10. `disabled`
+
+## Examples
+
+Examples of **incorrect** code for this rule:
+
+```gjs
+<template>
+  <div id="main" class="container"></div>
+</template>
+```
+
+```gjs
+<template>
+  <button aria-label="Submit" role="button">Send</button>
+</template>
+```
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  <div class="container" id="main"></div>
+</template>
+```
+
+```gjs
+<template>
+  <button class="btn" role="button" aria-label="Submit">Send</button>
+</template>
+```
+
+## Configuration
+
+You can customize the order by providing an `order` array:
+
+```js
+module.exports = {
+  rules: {
+    'ember/template-attribute-order': [
+      'error',
+      {
+        order: ['class', 'id', 'role', 'aria-', 'type'],
+      },
+    ],
+  },
+};
+```
+
+## References
+
+- [ember-template-lint attribute-order](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/attribute-order.md)

lib/rules/template-attribute-order.js

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+/** @type {import('eslint').Rule.RuleModule} */
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'enforce consistent ordering of attributes in template elements',
+      category: 'Stylistic Issues',
+      strictGjs: true,
+      strictGts: true,
+      url: 'https://github.com/ember-cli/eslint-plugin-ember/tree/master/docs/rules/template-attribute-order.md',
+    },
+    fixable: null,
+    schema: [
+      {
+        type: 'object',
+        properties: {
+          order: {
+            type: 'array',
+            items: {
+              type: 'string',
+            },
+          },
+        },
+        additionalProperties: false,
+      },
+    ],
+    messages: {
+      wrongOrder: 'Attribute "{{currentAttr}}" should come {{position}} "{{expectedAttr}}".',
+    },
+  },
+
+  create(context) {
+    const options = context.options[0] || {};
+    const order = options.order || [
+      'class',
+      'id',
+      'role',
+      'aria-',
+      'data-test-',
+      'type',
+      'name',
+      'value',
+      'placeholder',
+      'disabled',
+    ];
+
+    function getAttributeCategory(attrName) {
+      for (const category of order) {
+        if (category.endsWith('-')) {
+          if (attrName.startsWith(category)) {
+            return category;
+          }
+        } else if (attrName === category) {
+          return category;
+        }
+      }
+      return null;
+    }
+
+    function getExpectedIndex(attrName) {
+      const category = getAttributeCategory(attrName);
+      if (category === null) {
+        return order.length; // Unknown attributes go last
+      }
+      return order.indexOf(category);
+    }
+
+    return {
+      GlimmerElementNode(node) {
+        if (!node.attributes || node.attributes.length < 2) {
+          return;
+        }
+
+        const attributes = node.attributes.filter(
+          (attr) => attr.type === 'GlimmerAttrNode' && attr.name
+        );
+
+        for (let i = 1; i < attributes.length; i++) {
+          const current = attributes[i];
+          const currentIndex = getExpectedIndex(current.name);
+
+          for (let j = 0; j < i; j++) {
+            const previous = attributes[j];
+            const previousIndex = getExpectedIndex(previous.name);
+
+            if (currentIndex < previousIndex) {
+              context.report({
+                node: current,
+                messageId: 'wrongOrder',
+                data: {
+                  currentAttr: current.name,
+                  position: 'before',
+                  expectedAttr: previous.name,
+                },
+              });
+              break;
+            }
+          }
+        }
+      },
+    };
+  },
+};

tests/lib/rules/template-attribute-order.js

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+const rule = require('../../../lib/rules/template-attribute-order');
+const RuleTester = require('eslint').RuleTester;
+
+const ruleTester = new RuleTester({
+  parser: require.resolve('ember-eslint-parser'),
+  parserOptions: { ecmaVersion: 2022, sourceType: 'module' },
+});
+
+ruleTester.run('template-attribute-order', rule, {
+  valid: [
+    '<template><div class="foo" id="bar"></div></template>',
+    '<template><button class="btn" role="button" aria-label="Submit"></button></template>',
+    '<template><input type="text" name="username" value=""></template>',
+    '<template><div data-test-id="foo"></div></template>',
+  ],
+
+  invalid: [
+    {
+      code: '<template><div id="bar" class="foo"></div></template>',
+      output: null,
+      errors: [{ messageId: 'wrongOrder' }],
+    },
+    {
+      code: '<template><button aria-label="Submit" role="button"></button></template>',
+      output: null,
+      errors: [{ messageId: 'wrongOrder' }],
+    },
+    {
+      code: '<template><input name="username" type="text"></template>',
+      output: null,
+      errors: [{ messageId: 'wrongOrder' }],
+    },
+  ],
+});