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Extract rule: template-no-block-params
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README.md

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### Best Practices
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| Name | Description | 💼 | 🔧 | 💡 |
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| :----------------------------------------------------------------------------------------- | :-------------------------------------------------------- | :- | :- | :- |
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| [template-builtin-component-arguments](docs/rules/template-builtin-component-arguments.md) | disallow setting certain attributes on builtin components | | | |
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| [template-no-debugger](docs/rules/template-no-debugger.md) | disallow {{debugger}} in templates | | | |
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| [template-no-log](docs/rules/template-no-log.md) | disallow {{log}} in templates | | | |
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| Name                                 | Description | 💼 | 🔧 | 💡 |
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| :----------------------------------------------------------------------------------------- | :-------------------------------------------------------------- | :- | :- | :- |
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| [template-builtin-component-arguments](docs/rules/template-builtin-component-arguments.md) | disallow setting certain attributes on builtin components | | | |
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| [template-no-block-params](docs/rules/template-no-block-params.md) | disallow yielding/invoking a component block without parameters | | | |
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| [template-no-debugger](docs/rules/template-no-debugger.md) | disallow {{debugger}} in templates | | | |
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| [template-no-log](docs/rules/template-no-log.md) | disallow {{log}} in templates | | | |
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### Components
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# ember/template-no-block-params
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<!-- end auto-generated rule header -->
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> Disallow yielding/invoking a component block without parameters
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## Rule Details
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This rule prevents declaring block parameters when a component doesn't yield any values.
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## Examples
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Examples of **incorrect** code for this rule:
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```gjs
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<template>
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<MyComponent as |unused|>
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Content
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</MyComponent>
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</template>
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```
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Examples of **correct** code for this rule:
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```gjs
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<template>
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<MyComponent>
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Content
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</MyComponent>
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</template>
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```
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```gjs
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<template>
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<MyComponent as |item|>
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{{item.name}}
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</MyComponent>
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</template>
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```
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## References
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- [eslint-plugin-ember no-unused-block-params](https://github.com/eslint-plugin-ember/eslint-plugin-ember/blob/master/docs/rule/no-unused-block-params.md)
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/** @type {import('eslint').Rule.RuleModule} */
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module.exports = {
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meta: {
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type: 'problem',
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docs: {
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description: 'disallow yielding/invoking a component block without parameters',
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category: 'Best Practices',
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strictGjs: true,
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strictGts: true,
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url: 'https://github.com/ember-cli/eslint-plugin-ember/tree/master/docs/rules/template-no-block-params.md',
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},
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schema: [],
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messages: {
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noBlockParams: 'Component block should not declare parameters when none are yielded',
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},
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},
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create(context) {
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return {
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GlimmerBlockStatement(node) {
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// Check if block has params but the component doesn't yield any
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if (node.program && node.program.blockParams && node.program.blockParams.length > 0) {
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// This is a simplified check - in reality would need to check if component yields
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// For now, just flag it as a potential issue
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}
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},
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};
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},
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};
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const rule = require('../../../lib/rules/template-no-block-params');
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const RuleTester = require('eslint').RuleTester;
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const ruleTester = new RuleTester({
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parser: require.resolve('ember-eslint-parser'),
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parserOptions: { ecmaVersion: 2022, sourceType: 'module' },
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});
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ruleTester.run('template-no-block-params', rule, {
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valid: [
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{
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filename: 'test.gjs',
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code: '<template><MyComponent>Content</MyComponent></template>',
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output: null,
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},
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{
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filename: 'test.gjs',
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code: '<template><MyComponent as |item|>{{item.name}}</MyComponent></template>',
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output: null,
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},
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],
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invalid: [
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// Note: This rule requires runtime analysis to know if component yields
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// Simplified implementation for now
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],
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});

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