Merge pull request ember-cli#2636 from tcjr/unused-block-attr

Fix rule: ember/template-no-unused-block-params

Author: NullVoxPopuli

lib/rules/template-no-unused-block-params.js

@@ -24,6 +24,11 @@ function collectChildNodes(n) {
   if (n.children) {
     children.push(...n.children);
   }
+  // GlimmerPathExpression also has 'parts', so make sure we're not treating
+  // concat'd path string parts as AST nodes.
+  if (n.type === 'GlimmerConcatStatement' && n.parts) {
+    children.push(...n.parts);
+  }
   return children;
 }
 

tests/lib/rules/template-no-unused-block-params.js

@@ -11,6 +11,21 @@ const validHbs = [
   '{{#each cats as |cat|}}{{meow cat}}{{/each}}',
   '{{#each cats as |cat index|}}{{index}}{{/each}}',
   '{{#each cats as |cat index|}}{{#each cat.lives as |life|}}{{index}}: {{life}}{{/each}}{{/each}}',
+  `
+  {{#each cats as |cat|}}
+    <div data-cat-name={{cat.name}}></div>
+  {{/each}}
+  `,
+  `
+  {{#each cats as |cat|}}
+    <div class="cat {{cat.name}}"></div>
+  {{/each}}
+  `,
+  `
+  {{#each cats as |cat|}}
+    <div class="cat {{if (isFavorite cat.name favoriteCatNames) 'favorite'}}"></div>
+  {{/each}}
+  `,
   `
     <MyComponent @model={{this.model}} as |param|>
       {{! template-lint-disable }}
@@ -98,6 +113,16 @@ const invalidHbs = [
     output: null,
     errors: [{ messageId: 'unusedBlockParam', data: { param: 'life' } }],
   },
+  {
+    code: '{{#each cats as |cat|}}plain cat text{{/each}}',
+    output: null,
+    errors: [{ messageId: 'unusedBlockParam', data: { param: 'cat' } }],
+  },
+  {
+    code: '{{#each cats as |cat|}}{{a.different.cat}}{{/each}}',
+    output: null,
+    errors: [{ messageId: 'unusedBlockParam', data: { param: 'cat' } }],
+  },
 ];
 
 function wrapTemplate(entry) {