[fix] TypeScript config: lookup for external modules in @types folder

CHANGELOG.md

@@ -7,9 +7,8 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 ## [Unreleased]
 ### Fixed
 - [`no-unused-modules`]: fix usage of `import/extensions` settings ([#1560], thanks [@stekycz])
-
-### Fixed
 - [`import/extensions`]: ignore non-main modules ([#1563], thanks [@saschanaz])
+- TypeScript config: lookup for external modules in @types folder ([#1526], thanks [@joaovieira])
 
 ## [2.19.1] - 2019-12-08
 ### Fixed
@@ -629,6 +628,7 @@ for info on changes for earlier releases.
 [#1560]: https://github.com/benmosher/eslint-plugin-import/pull/1560
 [#1551]: https://github.com/benmosher/eslint-plugin-import/pull/1551
 [#1542]: https://github.com/benmosher/eslint-plugin-import/pull/1542
+[#1526]: https://github.com/benmosher/eslint-plugin-import/pull/1526
 [#1521]: https://github.com/benmosher/eslint-plugin-import/pull/1521
 [#1519]: https://github.com/benmosher/eslint-plugin-import/pull/1519
 [#1507]: https://github.com/benmosher/eslint-plugin-import/pull/1507
@@ -1046,3 +1046,4 @@ for info on changes for earlier releases.
 [@randallreedjr]: https://github.com/randallreedjr
 [@Pessimistress]: https://github.com/Pessimistress
 [@stekycz]: https://github.com/stekycz
+[@joaovieira]: https://github.com/joaovieira

config/typescript.js

@@ -8,6 +8,7 @@ module.exports = {
 
   settings: {
     'import/extensions': allExtensions,
+    'import/external-module-folders': ['node_modules', 'node_modules/@types'],
     'import/parsers': {
       '@typescript-eslint/parser': ['.ts', '.tsx', '.d.ts'],
     },

package.json

@@ -17,11 +17,11 @@
   "scripts": {
     "build": "babel --quiet --out-dir lib src",
     "prebuild": "rimraf lib",
-    "watch": "npm run mocha -- --watch tests/src",
+    "watch": "npm run mocha -- --watch tests/{src,config}",
     "pretest": "linklocal",
     "posttest": "eslint .",
     "mocha": "cross-env BABEL_ENV=test NODE_PATH=./src nyc -s mocha -R dot --recursive -t 5s",
-    "test": "npm run mocha tests/src",
+    "test": "npm run mocha tests/{src,config}",
     "test-compiled": "npm run prepublish && NODE_PATH=./lib mocha --compilers js:babel-register --recursive tests/src",
     "test-all": "npm test && for resolver in ./resolvers/*; do cd $resolver && npm test && cd ../..; done",
     "prepublish": "npm run build",

tests/config/typescript.js

@@ -0,0 +1,14 @@
+import path from 'path'
+import { expect } from 'chai'
+
+const config = require(path.join(__dirname, '..', '..', 'config', 'typescript'))
+
+describe('config typescript', () => {
+  // https://github.com/benmosher/eslint-plugin-import/issues/1525
+  it('should mark @types paths as external', () => {
+    const externalModuleFolders = config.settings['import/external-module-folders']
+    expect(externalModuleFolders).to.exist
+    expect(externalModuleFolders).to.contain('node_modules')
+    expect(externalModuleFolders).to.contain('node_modules/@types')
+  })
+})