[Fix] default/TypeScript: avoid crash on export = with a MemberEx…

…pression

Fixes #1841

CHANGELOG.md

@@ -6,6 +6,9 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 
 ## [Unreleased]
 
+### Fixed
+- [`default`]/TypeScript: avoid crash on `export =` with a MemberExpression ([#1841], thanks [@ljharb])
+
 ## [2.22.0] - 2020-06-26
 ### Added
 - [`no-unused-modules`]: consider exported TypeScript interfaces, types and enums ([#1819], thanks [@nicolashenry])
@@ -722,6 +725,7 @@ for info on changes for earlier releases.
 
 [`memo-parser`]: ./memo-parser/README.md
 
+[#1841]: https://github.com/benmosher/eslint-plugin-import/issues/1841
 [#1836]: https://github.com/benmosher/eslint-plugin-import/pull/1836
 [#1835]: https://github.com/benmosher/eslint-plugin-import/pull/1835
 [#1834]: https://github.com/benmosher/eslint-plugin-import/issues/1834

src/ExportMap.js

@@ -564,7 +564,7 @@ ExportMap.parse = function (path, content, context) {
     if (includes(exports, n.type)) {
       const exportedName = n.type === 'TSNamespaceExportDeclaration'
         ? n.id.name
-        : n.expression && n.expression.name || n.expression.id.name
+        : (n.expression && n.expression.name || (n.expression.id && n.expression.id.name) || null)
       const declTypes = [
         'VariableDeclaration',
         'ClassDeclaration',

tests/src/rules/default.js

@@ -220,6 +220,14 @@ context('TypeScript', function () {
               tsconfigRootDir: path.resolve(__dirname, '../../files/typescript-export-as-default-namespace/'),
             },
           }),
+          test({
+            code: `import foobar from "./typescript-export-assign-property"`,
+            parser: parser,
+            settings: {
+              'import/parsers': { [parser]: ['.ts'] },
+              'import/resolver': { 'eslint-import-resolver-typescript': true },
+            },
+          }),
         ],
 
         invalid: [