From 3671356143c8954b874a8296365916df2d1ca462 Mon Sep 17 00:00:00 2001
From: Eddie Leffler <eddie.leffler@gmail.com>
Date: Thu, 23 Aug 2018 17:50:52 -0700
Subject: [PATCH] Support turning of node_modules default exclude via flag

---
 packages/test-exclude/index.js             |  8 ++++++--
 packages/test-exclude/test/test-exclude.js | 19 +++++++++++++++++++
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/packages/test-exclude/index.js b/packages/test-exclude/index.js
index 0f807095..fd41b0be 100644
--- a/packages/test-exclude/index.js
+++ b/packages/test-exclude/index.js
@@ -14,7 +14,8 @@ class TestExclude {
                 relativePath: true,
                 configKey: null, // the key to load config from in package.json.
                 configPath: null, // optionally override requireMainFilename.
-                configFound: false
+                configFound: false,
+                excludeNodeModules: true
             },
             opts
         );
@@ -41,7 +42,10 @@ class TestExclude {
             this.include = false;
         }
 
-        if (!this.exclude.includes('**/node_modules/**')) {
+        if (
+            this.excludeNodeModules &&
+            !this.exclude.includes('**/node_modules/**')
+        ) {
             this.exclude.push('**/node_modules/**');
         }
 
diff --git a/packages/test-exclude/test/test-exclude.js b/packages/test-exclude/test/test-exclude.js
index b8545801..fa3bdf24 100644
--- a/packages/test-exclude/test/test-exclude.js
+++ b/packages/test-exclude/test/test-exclude.js
@@ -131,6 +131,25 @@ describe('testExclude', function() {
         e.shouldInstrument('src/foo.js').should.equal(true);
     });
 
+    it('allows node_modules default exclusion glob to be turned off, if excludeNodeModules === false', function() {
+        const e = exclude({
+            excludeNodeModules: false,
+            exclude: ['node_modules/**', '**/__test__/**']
+        });
+
+        e.shouldInstrument('node_modules/cat.js').should.equal(false);
+        e.shouldInstrument('./banana/node_modules/cat.js').should.equal(true);
+        e.shouldInstrument(
+            './banana/node_modules/__test__/cat.test.js'
+        ).should.equal(false);
+        e.shouldInstrument(
+            './banana/node_modules/__test__/cat-test.js'
+        ).should.equal(false);
+        e.shouldInstrument(
+            './banana/node_modules/__test__/cat.js'
+        ).should.equal(false);
+    });
+
     it('allows negated exclude patterns', function() {
         const e = exclude({
             exclude: ['foo/**', '!foo/bar.js']