Add 20 new template lint rules

Co-authored-by: NullVoxPopuli <[email protected]>

Author: Copilot

README.md

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+# ember/template-attribute-indentation
+
+🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
+
+<!-- end auto-generated rule header -->
+
+Enforces consistent attribute indentation in templates.
+
+This is a stylistic rule that is disabled by default.
+
+## Rule Details
+
+This rule enforces consistent indentation for attributes in template elements.
+
+## Examples
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  <div class="foo"></div>
+</template>
+```
+
+```gjs
+<template>
+  <MyComponent @arg="value" />
+</template>
+```
+
+## References
+
+- [ember-template-lint attribute-indentation](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/attribute-indentation.md)

docs/rules/template-attribute-indentation.md

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+# ember/template-block-indentation
+
+🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
+
+<!-- end auto-generated rule header -->
+
+Enforces consistent block indentation in templates.
+
+This is a stylistic rule that is disabled by default.
+
+## Rule Details
+
+This rule enforces consistent indentation for block statements in templates.
+
+## Examples
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  {{#if condition}}
+    <div>Content</div>
+  {{/if}}
+</template>
+```
+
+```gjs
+<template>
+  <div>Content</div>
+</template>
+```
+
+## References
+
+- [ember-template-lint block-indentation](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/block-indentation.md)

docs/rules/template-block-indentation.md

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+# ember/template-linebreak-style
+
+🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/latest/user-guide/command-line-interface#--fix).
+
+<!-- end auto-generated rule header -->
+
+Enforces consistent linebreak style in templates.
+
+This is a stylistic rule that is disabled by default.
+
+## Rule Details
+
+This rule enforces consistent linebreak style (LF or CRLF) in templates.
+
+## Examples
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  <div>Content</div>
+</template>
+```
+
+## References
+
+- [ember-template-lint linebreak-style](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/linebreak-style.md)

docs/rules/template-linebreak-style.md

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+# ember/template-no-at-ember-render-modifiers
+
+💼 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 -->
+
+Disallows usage of modifiers from @ember/render-modifiers.
+
+## Rule Details
+
+The modifiers from `@ember/render-modifiers` (`{{did-insert}}`, `{{did-update}}`, `{{will-destroy}}`) should be replaced with alternatives from `ember-render-helpers` or other modern approaches.
+
+## Examples
+
+Examples of **incorrect** code for this rule:
+
+```gjs
+<template>
+  <div {{did-insert this.setup}}></div>
+</template>
+```
+
+```gjs
+<template>
+  <div {{did-update this.update}}></div>
+</template>
+```
+
+```gjs
+<template>
+  <div {{will-destroy this.cleanup}}></div>
+</template>
+```
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  <div {{on "click" this.handleClick}}></div>
+</template>
+```
+
+## References
+
+- [ember-template-lint no-at-ember-render-modifiers](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-at-ember-render-modifiers.md)

docs/rules/template-no-at-ember-render-modifiers.md

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+# ember/template-no-attribute-splat-on-html-element
+
+💼 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 -->
+
+Disallows using `...attributes` on HTML elements.
+
+## Rule Details
+
+The `...attributes` syntax should only be used on component elements, not on HTML elements, to avoid confusion and maintain clear component boundaries.
+
+## Examples
+
+Examples of **incorrect** code for this rule:
+
+```gjs
+<template>
+  <div ...attributes></div>
+</template>
+```
+
+```gjs
+<template>
+  <span ...attributes></span>
+</template>
+```
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  <MyComponent ...attributes />
+</template>
+```
+
+```gjs
+<template>
+  <div class="wrapper"></div>
+</template>
+```
+
+## References
+
+- [ember-template-lint no-attrs-in-components](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-attrs-in-components.md)

docs/rules/template-no-attribute-splat-on-html-element.md

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+# ember/template-no-builtin-form-components
+
+💼 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 -->
+
+Disallows usage of built-in form components.
+
+## Rule Details
+
+Built-in Ember components like `<Input>`, `<Textarea>`, and `<LinkTo>` should be replaced with native HTML elements for better performance and simpler code.
+
+## Examples
+
+Examples of **incorrect** code for this rule:
+
+```gjs
+<template>
+  <Input @type="text" />
+</template>
+```
+
+```gjs
+<template>
+  <Textarea @value={{this.text}} />
+</template>
+```
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  <input type="text" />
+</template>
+```
+
+```gjs
+<template>
+  <textarea></textarea>
+</template>
+```
+
+## References
+
+- [ember-template-lint no-builtin-form-components](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-builtin-form-components.md)

docs/rules/template-no-builtin-form-components.md

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+# ember/template-no-class-bindings
+
+💼 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 -->
+
+Disallows usage of class attribute bindings.
+
+## Rule Details
+
+This rule discourages the use of class attribute bindings with colon syntax. Use the `{{class}}` helper or individual classes instead for better readability and maintainability.
+
+## Examples
+
+Examples of **incorrect** code for this rule:
+
+```gjs
+<template>
+  <div class={{isActive:active:inactive}}></div>
+</template>
+```
+
+```gjs
+<template>
+  <div class={{foo:bar}}></div>
+</template>
+```
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  <div class={{if this.isActive "active" "inactive"}}></div>
+</template>
+```
+
+```gjs
+<template>
+  <div class={{this.myClass}}></div>
+</template>
+```
+
+## References
+
+- [ember-template-lint no-class-bindings](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-class-bindings.md)

docs/rules/template-no-class-bindings.md

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+# ember/template-no-extra-mut-helpers
+
+💼 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 -->
+
+Disallows unnecessary `mut` helpers.
+
+## Rule Details
+
+The `mut` helper is often unnecessary when passing simple values or properties. It should only be used when explicitly creating a mutable reference is required.
+
+## Examples
+
+Examples of **incorrect** code for this rule:
+
+```gjs
+<template>
+  <MyComponent @onChange={{mut this.value}} />
+</template>
+```
+
+```gjs
+<template>
+  <Input @value={{mut this.text}} />
+</template>
+```
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  <MyComponent @value={{this.value}} />
+</template>
+```
+
+```gjs
+<template>
+  <Input @value={{this.text}} />
+</template>
+```
+
+## References
+
+- [ember-template-lint no-extra-mut-helper-argument](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-extra-mut-helper-argument.md)

docs/rules/template-no-extra-mut-helpers.md

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+# ember/template-no-index-component-invocation
+
+💼 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 -->
+
+Disallows invocation of components with `/index` suffix.
+
+## Rule Details
+
+Components should be invoked using the parent directory name instead of appending `/index` to the path.
+
+## Examples
+
+Examples of **incorrect** code for this rule:
+
+```gjs
+<template>
+  <MyComponent/index />
+</template>
+```
+
+```gjs
+<template>
+  <Foo/index />
+</template>
+```
+
+Examples of **correct** code for this rule:
+
+```gjs
+<template>
+  <MyComponent />
+</template>
+```
+
+```gjs
+<template>
+  <Foo />
+</template>
+```
+
+## References
+
+- [ember-template-lint no-index-component-invocation](https://github.com/ember-template-lint/ember-template-lint/blob/master/docs/rule/no-index-component-invocation.md)