[Fix] jsx-no-target-blank: avoid crash on attr-only href

Fixes #3066

Co-authored-by: Jordan Harband <ljharb@gmail.com>
Co-authored-by: Gary Butler <gary.butler@myob.com>

CHANGELOG.md

@@ -8,8 +8,10 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 ### Fixed
 * [`jsx-no-useless-fragments`]: Handle insignificant whitespace correctly when `allowExpressions` is `true` ([#3061][] @benj-dobs)
 * [`prop-types`], `propTypes`: handle implicit `children` prop in react's generic types ([#3064][] @vedadeepta)
-* [`display-name`]: fix arrow function returning result of function call with JSX arguments being interpreted as component ([#3065][], @danielfinke)
+* [`display-name`]: fix arrow function returning result of function call with JSX arguments being interpreted as component ([#3065][] @danielfinke)
+* [`jsx-no-target-blank`]: avoid crash on attr-only href ([#3066][] @ljharb @gaz77a)
 
+[#3066]: https://github.com/yannickcr/eslint-plugin-react/issue/3066
 [#3065]: https://github.com/yannickcr/eslint-plugin-react/pull/3065
 [#3064]: https://github.com/yannickcr/eslint-plugin-react/pull/3064
 [#3061]: https://github.com/yannickcr/eslint-plugin-react/pull/3061

lib/rules/jsx-no-target-blank.js

@@ -49,7 +49,7 @@ function attributeValuePossiblyBlank(attribute) {
 
 function hasExternalLink(node, linkAttribute, warnOnSpreadAttributes, spreadAttributeIndex) {
   const linkIndex = findLastIndex(node.attributes, (attr) => attr.name && attr.name.name === linkAttribute);
-  const foundExternalLink = linkIndex !== -1 && ((attr) => attr.value.type === 'Literal' && /^(?:\w+:|\/\/)/.test(attr.value.value))(
+  const foundExternalLink = linkIndex !== -1 && ((attr) => attr.value && attr.value.type === 'Literal' && /^(?:\w+:|\/\/)/.test(attr.value.value))(
     node.attributes[linkIndex]);
   return foundExternalLink || (warnOnSpreadAttributes && linkIndex < spreadAttributeIndex);
 }

tests/lib/rules/jsx-no-target-blank.js

@@ -135,6 +135,9 @@ ruleTester.run('jsx-no-target-blank', rule, {
     {
       code: '<form action="http://example.com" target="_blank" rel="noopener noreferrer"></form>',
       options: [{forms: true, links: false}]
+    },
+    {
+      code: '<a href target="_blank"/>'
     }
   ],
   invalid: [