reference tag name parts (split up with dot) instead of whole tag

lib/parsers/gjs-gts-parser.js

@@ -7,6 +7,7 @@ const typescriptParser = require('@typescript-eslint/parser');
 const TypescriptScope = require('@typescript-eslint/scope-manager');
 const { Reference, Scope, Variable, Definition } = require('eslint-scope');
 const { registerParsedFile } = require('../preprocessors/noop');
+const htmlTags = require('html-tags');
 
 /**
  * finds the nearest node scope
@@ -260,6 +261,34 @@ function preprocessGlimmerTemplates(info, code) {
         n.loc.start = codeLines.offsetToPosition(tpl.templateRange[0]);
         n.loc.end = codeLines.offsetToPosition(tpl.templateRange[1]);
       }
+      // split up element node into sub nodes to be able to reference tag name
+      // parts <Foo.Bar /> -> nodes for `Foo` and `Bar`
+      if (n.type === 'ElementNode') {
+        n.name = n.tag;
+        n.parts = [];
+        let start = n.range[0];
+        let codeSlice = code.slice(...n.range);
+        for (const part of n.tag.split('.')) {
+          const regex = new RegExp(`\\b${part}\\b`);
+          const match = codeSlice.match(regex);
+          const range = [start + match.index, 0];
+          range[1] = range[0] + part.length;
+          codeSlice = code.slice(range[1], n.range[1]);
+          start = range[1];
+          n.parts.push({
+            type: 'GlimmerElementNodePart',
+            name: part,
+            range,
+            parent: n,
+            loc: {
+              start: codeLines.offsetToPosition(range[0]),
+              end: codeLines.offsetToPosition(range[1]),
+            },
+          });
+        }
+      }
+      // block params do not have location information
+      // add our own nodes so we can reference them
       if ('blockParams' in n) {
         n.params = [];
       }
@@ -353,6 +382,7 @@ function convertAst(result, preprocessedResult, visitorKeys) {
     result.ast.tokens.splice(firstIdx, lastIdx - firstIdx + 1, ...ti.ast.tokens);
   }
 
+  // eslint-disable-next-line complexity
   traverse(visitorKeys, result.ast, (path) => {
     const node = path.node;
     if (
@@ -389,10 +419,19 @@ function convertAst(result, preprocessedResult, visitorKeys) {
       }
     }
     if (node.type === 'GlimmerElementNode') {
-      node.name = node.tag;
-      const { scope, variable } = findVarInParentScopes(result.scopeManager, path, node.tag) || {};
-      if (scope && (variable || isUpperCase(node.tag[0]))) {
-        registerNodeInScope(node, scope, variable);
+      // always reference first part of tag name, this also has the advantage
+      // that errors regarding this tag will only mark the tag name instead of
+      // the whole tag + children
+      const n = node.parts[0];
+      const { scope, variable } = findVarInParentScopes(result.scopeManager, path, n.name) || {};
+      if (
+        scope &&
+        (variable ||
+          isUpperCase(n.name[0]) ||
+          node.name.includes('.') ||
+          !htmlTags.includes(node.name))
+      ) {
+        registerNodeInScope(n, scope, variable);
       }
     }
 

package.json

@@ -79,6 +79,7 @@
     "eslint-scope": "^7.2.2",
     "eslint-utils": "^3.0.0",
     "estraverse": "^5.3.0",
+    "html-tags": "^3.3.1",
     "lodash.camelcase": "^4.3.0",
     "lodash.kebabcase": "^4.1.1",
     "requireindex": "^1.2.0",

tests/lib/rules-preprocessor/gjs-gts-parser-test.js

@@ -257,6 +257,8 @@ const invalid = [
       {{#let 'x' as |noop notUsed usedEl|}}
         {{noop}}
         <usedEl />
+        <undef.x />
+        <non-std-html-tag />
       {{/let}}
       </template>
     `,
@@ -272,21 +274,54 @@ const invalid = [
         ruleId: 'no-unused-vars',
         severity: 2,
       },
+      {
+        column: 10,
+        endColumn: 15,
+        endLine: 6,
+        line: 6,
+        message: "'undef' is not defined.",
+        messageId: 'undef',
+        nodeType: 'GlimmerElementNodePart',
+        ruleId: 'no-undef',
+        severity: 2,
+      },
+      {
+        column: 10,
+        endColumn: 26,
+        endLine: 7,
+        line: 7,
+        message: "'non-std-html-tag' is not defined.",
+        messageId: 'undef',
+        nodeType: 'GlimmerElementNodePart',
+        ruleId: 'no-undef',
+        severity: 2,
+      },
     ],
   },
   {
     filename: 'my-component.gjs',
     code: `
       <template>
         <Foo />
+        <Bar>
+          <div></div>
+        </Bar>
       </template>
     `,
     errors: [
       {
         message: "'Foo' is not defined.",
         line: 3,
-        column: 9,
-        endColumn: 16,
+        endLine: 3,
+        column: 10,
+        endColumn: 13,
+      },
+      {
+        message: "'Bar' is not defined.",
+        line: 4,
+        endLine: 4,
+        column: 10,
+        endColumn: 13,
       },
     ],
   },
@@ -301,8 +336,8 @@ const invalid = [
       {
         message: "'F_0_O' is not defined.",
         line: 3,
-        column: 9,
-        endColumn: 18,
+        column: 10,
+        endColumn: 15,
       },
     ],
   },
@@ -681,13 +716,13 @@ describe('multiple tokens in same file', () => {
     });
 
     expect(resultErrors[1]).toStrictEqual({
-      column: 30,
-      endColumn: 37,
+      column: 31,
+      endColumn: 34,
       endLine: 4,
       line: 4,
       message: "'Bad' is not defined.",
       messageId: 'undef',
-      nodeType: 'GlimmerElementNode',
+      nodeType: 'GlimmerElementNodePart',
       ruleId: 'no-undef',
       severity: 2,
     });

yarn.lock

@@ -3471,6 +3471,11 @@ html-escaper@^2.0.0:
   resolved "https://registry.yarnpkg.com/html-escaper/-/html-escaper-2.0.2.tgz#dfd60027da36a36dfcbe236262c00a5822681453"
   integrity sha512-H2iMtd0I4Mt5eYiapRdIDjp+XzelXQ0tFE4JS7YFwFevXXMmOp9myNrUvCg0D6ws8iqkRPBfKHgbwig1SmlLfg==
 
+html-tags@^3.3.1:
+  version "3.3.1"
+  resolved "https://registry.yarnpkg.com/html-tags/-/html-tags-3.3.1.tgz#a04026a18c882e4bba8a01a3d39cfe465d40b5ce"
+  integrity sha512-ztqyC3kLto0e9WbNp0aeP+M3kTt+nbaIveGmUxAtZa+8iFgKLUOD4YKM5j+f3QD89bra7UeumolZHKuOXnTmeQ==
+
 http-cache-semantics@^4.1.0, http-cache-semantics@^4.1.1:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/http-cache-semantics/-/http-cache-semantics-4.1.1.tgz#abe02fcb2985460bf0323be664436ec3476a6d5a"