Extract rule: template-no-input-block

README.md

@@ -199,6 +199,7 @@ rules in templates can be disabled with eslint directives with mustache or html
 | [template-no-capital-arguments](docs/rules/template-no-capital-arguments.md)                           | disallow capital arguments (use lowercase @arg instead of @Arg) |    |    |    |
 | [template-no-debugger](docs/rules/template-no-debugger.md)                                             | disallow {{debugger}} in templates                              |    |    |    |
 | [template-no-element-event-actions](docs/rules/template-no-element-event-actions.md)                   | disallow element event actions (use {{on}} modifier instead)    |    |    |    |
+| [template-no-input-block](docs/rules/template-no-input-block.md)                                       | disallow block usage of {{input}} helper                        |    |    |    |
 | [template-no-log](docs/rules/template-no-log.md)                                                       | disallow {{log}} in templates                                   |    |    |    |
 
 ### Components

docs/rules/template-no-input-block.md

@@ -0,0 +1,24 @@
+# ember/template-no-input-block
+
+<!-- end auto-generated rule header -->
+
+Use of the block form of the handlebars `input` helper will result in an error at runtime.
+
+## Examples
+
+This rule **forbids** the following:
+
+```gjs
+<template>{{#input}}Some Content{{/input}}</template>
+```
+
+This rule **allows** the following:
+
+```gjs
+<template>{{input type='text' value=this.firstName disabled=this.entryNotAllowed size='50'}}</template>
+```
+
+## References
+
+- [Ember api/input component](https://api.emberjs.com/ember/release/classes/Ember.Templates.components/methods/Input?anchor=Input)
+- [rfcs/built in components](https://emberjs.github.io/rfcs/0459-angle-bracket-built-in-components.html)

lib/rules/template-no-input-block.js

@@ -0,0 +1,24 @@
+/** @type {import('eslint').Rule.RuleModule} */
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'disallow block usage of {{input}} helper',
+      category: 'Best Practices',
+      strictGjs: true,
+      strictGts: true,
+      url: 'https://github.com/ember-cli/eslint-plugin-ember/tree/master/docs/rules/template-no-input-block.md',
+    },
+    schema: [],
+    messages: { blockUsage: 'Unexpected block usage. The input helper may only be used inline.' },
+  },
+  create(context) {
+    return {
+      GlimmerBlockStatement(node) {
+        if (node.path?.type === 'GlimmerPathExpression' && node.path.original === 'input') {
+          context.report({ node, messageId: 'blockUsage' });
+        }
+      },
+    };
+  },
+};

tests/lib/rules/template-no-input-block.js

@@ -0,0 +1,23 @@
+const rule = require('../../../lib/rules/template-no-input-block');
+const RuleTester = require('eslint').RuleTester;
+
+const ruleTester = new RuleTester({
+  parser: require.resolve('ember-eslint-parser'),
+  parserOptions: { ecmaVersion: 2022, sourceType: 'module' },
+});
+ruleTester.run('template-no-input-block', rule, {
+  valid: [
+    '<template>{{input value=this.foo}}</template>',
+    // Test cases ported from ember-template-lint
+    '<template>{{button}}</template>',
+    '<template>{{#x-button}}{{/x-button}}</template>',
+    '<template>{{input}}</template>',
+  ],
+  invalid: [
+    {
+      code: '<template>{{#input}}{{/input}}</template>',
+      output: null,
+      errors: [{ messageId: 'blockUsage' }],
+    },
+  ],
+});