[Fix] order: avoid a crash on TypeScript’s export import syntax

Fixes #1808.

CHANGELOG.md

@@ -6,6 +6,9 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 
 ## [Unreleased]
 
+### Fixed
+- [`order`]: avoid a crash on TypeScript’s `export import` syntax ([#1808], thanks [@ljharb])
+
 ## [2.21.1] - 2020-06-07
 ### Fixed
 - TypeScript: [`import/named`]: avoid requiring `typescript` when not using TS ([#1805], thanks [@ljharb])
@@ -897,6 +900,8 @@ for info on changes for earlier releases.
 [#211]: https://github.com/benmosher/eslint-plugin-import/pull/211
 [#164]: https://github.com/benmosher/eslint-plugin-import/pull/164
 [#157]: https://github.com/benmosher/eslint-plugin-import/pull/157
+[#1808]: https://github.com/benmosher/eslint-plugin-import/issues/1808
+[#1805]: https://github.com/benmosher/eslint-plugin-import/issues/1805
 [#1565]: https://github.com/benmosher/eslint-plugin-import/issues/1565
 [#1366]: https://github.com/benmosher/eslint-plugin-import/issues/1366
 [#1334]: https://github.com/benmosher/eslint-plugin-import/issues/1334

src/core/importType.js

@@ -12,7 +12,7 @@ function baseModule(name) {
 }
 
 export function isAbsolute(name) {
-  return name.indexOf('/') === 0
+  return name && name.startsWith('/')
 }
 
 // path is defined only when a resolver resolves to a non-standard path

src/rules/order.js

@@ -611,6 +611,8 @@ module.exports = {
         let name
         if (node.moduleReference.type === 'TSExternalModuleReference') {
           name = node.moduleReference.expression.value
+        } else if (node.isExport) {
+          name = node.moduleReference.name
         } else {
           name = null
         }

tests/src/rules/order.js

@@ -183,6 +183,13 @@ ruleTester.run('order', rule, {
         `,
         parser,
       }),
+
+      test({
+        code: `
+          export import CreateSomething = _CreateSomething;
+        `,
+        parser,
+      }),
     ]),
     // Adding unknown import types (e.g. using a resolver alias via babel) to the groups.
     test({