[Fix] display-name: unwrap TS as expressions

Fixes #3032

CHANGELOG.md

@@ -14,7 +14,9 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 * [`jsx-fragments`], [`jsx-no-useless-fragment`]: avoid a crash on fragment syntax in `typescript-eslint` parser (@ljharb)
 * [`jsx-props-no-multi-spaces`]: avoid a crash on long member chains in tag names in `typescript-eslint` parser (@ljharb)
 * [`no-unused-prop-types`], `usedPropTypes`: avoid crash with typescript-eslint parser (@ljharb)
+* [`display-name`]: unwrap TS `as` expressions ([#3110][] @ljharb)
 
+[#3110]: https://github.com/yannickcr/eslint-plugin-react/pull/3110
 [#3092]: https://github.com/yannickcr/eslint-plugin-react/pull/3092
 [#2166]: https://github.com/yannickcr/eslint-plugin-react/pull/2166
 [#1980]: https://github.com/yannickcr/eslint-plugin-react/pull/1980

lib/rules/display-name.js

@@ -5,6 +5,8 @@
 
 'use strict';
 
+const values = require('object.values');
+
 const Components = require('../util/Components');
 const astUtil = require('../util/ast');
 const docsUrl = require('../util/docsUrl');
@@ -122,7 +124,6 @@ module.exports = {
     // --------------------------------------------------------------------------
 
     return {
-
       ClassProperty(node) {
         if (!propsUtil.isDisplayNameDeclaration(node)) {
           return;
@@ -138,7 +139,7 @@ module.exports = {
         if (!component) {
           return;
         }
-        markDisplayNameAsDeclared(component.node);
+        markDisplayNameAsDeclared(component.node.type === 'TSAsExpression' ? component.node.expression : component.node);
       },
 
       FunctionExpression(node) {
@@ -215,7 +216,6 @@ module.exports = {
           // This means that we raise a single error for the call to React.memo
           // instead of one for React.memo and one for React.forwardRef
           const isWrappedInAnotherPragma = utils.getPragmaComponentWrapper(node);
-
           if (
             !isWrappedInAnotherPragma
             && (ignoreTranspilerName || !hasTranspilerName(node.arguments[0]))
@@ -232,8 +232,8 @@ module.exports = {
       'Program:exit'() {
         const list = components.list();
         // Report missing display name for all components
-        Object.keys(list).filter((component) => !list[component].hasDisplayName).forEach((component) => {
-          reportMissingDisplayName(list[component]);
+        values(list).filter((component) => !component.hasDisplayName).forEach((component) => {
+          reportMissingDisplayName(component);
         });
       },
     };

tests/lib/rules/display-name.js

@@ -520,6 +520,21 @@ ruleTester.run('display-name', rule, {
         };
       `,
     },
+    {
+      // issue 3032
+      code: `
+        const Comp = React.forwardRef((props, ref) => <main />);
+        Comp.displayName = 'MyCompName';
+      `,
+    },
+    {
+      // issue 3032
+      code: `
+        const Comp = React.forwardRef((props, ref) => <main data-as="yes" />) as SomeComponent;
+        Comp.displayName = 'MyCompNameAs';
+      `,
+      features: ['ts', 'no-babel'],
+    },
   ]),
 
   invalid: parsers.all([