[Fix] Fix interpreting some external modules being interpreted as internal modules

Fixes import-js#793.

 - Add skipped test to expect scoped internal packages to be "internal"

Author: ephys

Diff for: CHANGELOG.md

@@ -4,6 +4,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 This change log adheres to standards from [Keep a CHANGELOG](http://keepachangelog.com).
 
 ## [Unreleased]
+### Fixed
+- [`order`]: Fix interpreting some external modules being interpreted as internal modules ([#793], [#794] thanks [@ephys])
 
 
 ## [2.16.0] - 2019-01-29
@@ -538,6 +540,7 @@ for info on changes for earlier releases.
 [#843]: https://github.com/benmosher/eslint-plugin-import/pull/843
 [#871]: https://github.com/benmosher/eslint-plugin-import/pull/871
 [#797]: https://github.com/benmosher/eslint-plugin-import/pull/797
+[#794]: https://github.com/benmosher/eslint-plugin-import/pull/794
 [#744]: https://github.com/benmosher/eslint-plugin-import/pull/744
 [#742]: https://github.com/benmosher/eslint-plugin-import/pull/742
 [#737]: https://github.com/benmosher/eslint-plugin-import/pull/737
@@ -615,6 +618,7 @@ for info on changes for earlier releases.
 [#717]: https://github.com/benmosher/eslint-plugin-import/issues/717
 [#686]: https://github.com/benmosher/eslint-plugin-import/issues/686
 [#671]: https://github.com/benmosher/eslint-plugin-import/issues/671
+[#793]: https://github.com/benmosher/eslint-plugin-import/issues/793
 [#660]: https://github.com/benmosher/eslint-plugin-import/issues/660
 [#653]: https://github.com/benmosher/eslint-plugin-import/issues/653
 [#627]: https://github.com/benmosher/eslint-plugin-import/issues/627
@@ -804,3 +808,4 @@ for info on changes for earlier releases.
 [@kirill-konshin]: https://github.com/kirill-konshin
 [@asapach]: https://github.com/asapach
 [@sergei-startsev]: https://github.com/sergei-startsev
+[@ephys]: https://github.com/ephys

Diff for: package.json

@@ -57,6 +57,8 @@
     "eslint-import-resolver-typescript": "^1.0.2",
     "eslint-import-resolver-webpack": "file:./resolvers/webpack",
     "eslint-module-utils": "file:./utils",
+    "eslint-import-test-order-redirect": "file:./tests/files/order-redirect",
+    "@eslint/import-test-order-redirect-scoped": "file:./tests/files/order-redirect-scoped",
     "eslint-plugin-import": "2.x",
     "gulp": "^3.9.1",
     "gulp-babel": "6.1.2",

Diff for: src/core/importType.js

@@ -29,7 +29,11 @@ export function isBuiltIn(name, settings) {
 
 function isExternalPath(path, name, settings) {
   const folders = (settings && settings['import/external-module-folders']) || ['node_modules']
-  return !path || folders.some(folder => -1 < path.indexOf(join(folder, name)))
+
+  // extract the part before the first / (redux-saga/effects => redux-saga)
+  const packageName = name.match(/([^/]+)/)[0]
+
+  return !path || folders.some(folder => -1 < path.indexOf(join(folder, packageName)))
 }
 
 const externalModuleRegExp = /^\w/

Diff for: tests/files/@importType/index.js

@@ -0,0 +1 @@
+/* for importType test, just needs to exist */

Diff for: tests/files/order-redirect-scoped/module/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "order-redirect-module",
+  "private": true,
+  "main": "../other-module/file.js"
+}

Diff for: tests/files/order-redirect-scoped/other-module/file.js

@@ -0,0 +1,5 @@
+{
+  "name": "@eslint/import-test-order-redirect-scoped",
+  "version": "1.0.0",
+  "private": true
+}

Diff for: tests/files/order-redirect-scoped/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "order-redirect-module",
+  "private": true,
+  "main": "../other-module/file.js"
+}

Diff for: tests/files/order-redirect/module/package.json

@@ -0,0 +1,5 @@
+{
+  "name": "eslint-import-test-order-redirect",
+  "version": "1.0.0",
+  "private": true
+}

Diff for: tests/files/order-redirect/other-module/file.js

@@ -36,11 +36,21 @@ describe('importType(name)', function () {
     expect(importType('@some-thing/something/some-directory/someModule.js', context)).to.equal('external')
   })
 
+  it("should return 'external' for external modules that redirect to its parent module using package.json", function() {
+    expect(importType('eslint-import-test-order-redirect/module', context)).to.equal('external')
+    expect(importType('@eslint/import-test-order-redirect-scoped/module', context)).to.equal('external')
+  })
+
   it("should return 'internal' for non-builtins resolved outside of node_modules", function () {
     const pathContext = testContext({ "import/resolver": { node: { paths: [ path.join(__dirname, '..', '..', 'files') ] } } })
     expect(importType('importType', pathContext)).to.equal('internal')
   })
 
+  it.skip("should return 'internal' for scoped packages resolved outside of node_modules", function () {
+    const pathContext = testContext({ "import/resolver": { node: { paths: [ path.join(__dirname, '..', '..', 'files') ] } } })
+    expect(importType('@importType/index', pathContext)).to.equal('internal')
+  })
+
   it("should return 'parent' for internal modules that go through the parent", function() {
     expect(importType('../foo', context)).to.equal('parent')
     expect(importType('../../foo', context)).to.equal('parent')