[Fix] no-duplicates: Handle TS import type

package.json

@@ -55,7 +55,7 @@
   "devDependencies": {
     "@eslint/import-test-order-redirect-scoped": "file:./tests/files/order-redirect-scoped",
     "@test-scope/some-module": "file:./tests/files/symlinked-module",
-    "@typescript-eslint/parser": "1.10.3-alpha.13",
+    "@typescript-eslint/parser": "^2.22.0",
     "babel-cli": "^6.26.0",
     "babel-core": "^6.26.3",
     "babel-eslint": "^8.2.6",
@@ -68,7 +68,7 @@
     "cross-env": "^4.0.0",
     "eslint": "2.x - 6.x",
     "eslint-import-resolver-node": "file:./resolvers/node",
-    "eslint-import-resolver-typescript": "^1.0.2",
+    "eslint-import-resolver-typescript": "^2.0.0",
     "eslint-import-resolver-webpack": "file:./resolvers/webpack",
     "eslint-import-test-order-redirect": "file:./tests/files/order-redirect",
     "eslint-module-utils": "file:./utils",
@@ -82,7 +82,7 @@
     "rimraf": "^2.7.1",
     "semver": "^6.3.0",
     "sinon": "^2.4.1",
-    "typescript": "~3.2.2",
+    "typescript": "^3.8.3",
     "typescript-eslint-parser": "^22.0.0"
   },
   "peerDependencies": {

tests/src/rules/no-duplicates.js

@@ -1,5 +1,5 @@
 import * as path from 'path'
-import { test as testUtil } from '../utils'
+import { test as testUtil, getNonDefaultParsers } from '../utils'
 
 import { RuleTester } from 'eslint'
 
@@ -399,3 +399,30 @@ ruleTester.run('no-duplicates', rule, {
     }),
   ],
 })
+
+context('TypeScript', function() {
+  getNonDefaultParsers().forEach((parser) => {
+    const parserConfig = {
+      parser: parser,
+      settings: {
+        'import/parsers': { [parser]: ['.ts'] },
+        'import/resolver': { 'eslint-import-resolver-typescript': true },
+      },
+    }
+
+    ruleTester.run('no-duplicates', rule, {
+      valid: [
+        // #1667: ignore duplicate if is a typescript type import
+        test(
+          {
+            code: "import type { x } from './foo'; import y from './foo'",
+            parser,
+          },
+          parserConfig,
+        ),
+      ],
+      invalid: [],
+    })
+  })
+})
+