From 5d4e8b552b084f0133290f56859ff0d002d457fa Mon Sep 17 00:00:00 2001
From: NullVoxPopuli <199018+NullVoxPopuli@users.noreply.github.com>
Date: Tue, 17 Feb 2026 15:45:08 -0500
Subject: [PATCH] Extract rule: template-deprecated-render-helper

---
 README.md                                     |  1 +
 .../template-deprecated-render-helper.md      | 23 ++++++++++
 .../template-deprecated-render-helper.js      | 44 +++++++++++++++++++
 .../template-deprecated-render-helper.js      | 18 ++++++++
 4 files changed, 86 insertions(+)
 create mode 100644 docs/rules/template-deprecated-render-helper.md
 create mode 100644 lib/rules/template-deprecated-render-helper.js
 create mode 100644 tests/lib/rules/template-deprecated-render-helper.js

diff --git a/README.md b/README.md
index 1997fcd7ea..6224713570 100644
--- a/README.md
+++ b/README.md
@@ -236,6 +236,7 @@ rules in templates can be disabled with eslint directives with mustache or html
 | [no-observers](docs/rules/no-observers.md)                                                       | disallow usage of observers                               | ✅  |    |    |
 | [no-old-shims](docs/rules/no-old-shims.md)                                                       | disallow usage of old shims for modules                   | ✅  | 🔧 |    |
 | [no-string-prototype-extensions](docs/rules/no-string-prototype-extensions.md)                   | disallow usage of `String` prototype extensions           | ✅  |    |    |
+| [template-deprecated-render-helper](docs/rules/template-deprecated-render-helper.md)             | disallow {{render}} helper                                |    |    |    |
 
 ### Ember Data
 
diff --git a/docs/rules/template-deprecated-render-helper.md b/docs/rules/template-deprecated-render-helper.md
new file mode 100644
index 0000000000..31b9ff554c
--- /dev/null
+++ b/docs/rules/template-deprecated-render-helper.md
@@ -0,0 +1,23 @@
+# ember/template-deprecated-render-helper
+
+<!-- end auto-generated rule header -->
+
+Disallows the {{render}} helper which is deprecated.
+
+## Examples
+
+Incorrect:
+
+```gjs
+<template>{{render "user"}}</template>
+```
+
+Correct:
+
+```gjs
+<template><User /></template>
+```
+
+## References
+
+- [ember-template-lint deprecated-render-helper](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/deprecated-render-helper.md)
diff --git a/lib/rules/template-deprecated-render-helper.js b/lib/rules/template-deprecated-render-helper.js
new file mode 100644
index 0000000000..c214cbe717
--- /dev/null
+++ b/lib/rules/template-deprecated-render-helper.js
@@ -0,0 +1,44 @@
+/** @type {import('eslint').Rule.RuleModule} */
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description: 'disallow {{render}} helper',
+      category: 'Deprecations',
+      strictGjs: true,
+      strictGts: true,
+      url: 'https://github.com/ember-cli/eslint-plugin-ember/tree/master/docs/rules/template-deprecated-render-helper.md',
+    },
+    fixable: null,
+    schema: [],
+    messages: {
+      deprecated:
+        'The render helper is deprecated in favor of using components. See https://emberjs.com/deprecations/v2.x/#toc_code-render-code-helper',
+    },
+  },
+
+  create(context) {
+    function checkForRender(node) {
+      if (
+        node.path &&
+        node.path.type === 'GlimmerPathExpression' &&
+        node.path.original === 'render'
+      ) {
+        context.report({
+          node,
+          messageId: 'deprecated',
+        });
+      }
+    }
+
+    return {
+      GlimmerMustacheStatement(node) {
+        checkForRender(node);
+      },
+
+      GlimmerBlockStatement(node) {
+        checkForRender(node);
+      },
+    };
+  },
+};
diff --git a/tests/lib/rules/template-deprecated-render-helper.js b/tests/lib/rules/template-deprecated-render-helper.js
new file mode 100644
index 0000000000..393b639ebd
--- /dev/null
+++ b/tests/lib/rules/template-deprecated-render-helper.js
@@ -0,0 +1,18 @@
+const rule = require('../../../lib/rules/template-deprecated-render-helper');
+const RuleTester = require('eslint').RuleTester;
+
+const ruleTester = new RuleTester({
+  parser: require.resolve('ember-eslint-parser'),
+  parserOptions: { ecmaVersion: 2022, sourceType: 'module' },
+});
+
+ruleTester.run('template-deprecated-render-helper', rule, {
+  valid: ['<template><MyComponent /></template>', '<template>{{this.render}}</template>'],
+  invalid: [
+    {
+      code: '<template>{{render "user"}}</template>',
+      output: null,
+      errors: [{ messageId: 'deprecated' }],
+    },
+  ],
+});