From 90b11921181c2783209e9aa31f1e20d98c11ed17 Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Wed, 4 Apr 2018 22:04:03 -0700
Subject: [PATCH 1/3] [Tests] add a failing test

---
 test/pathfilter.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/test/pathfilter.js b/test/pathfilter.js
index eca7793b..16519aea 100644
--- a/test/pathfilter.js
+++ b/test/pathfilter.js
@@ -50,16 +50,23 @@ test('#62: deep module references and the pathFilter', function (t) {
     });
 
     t.test('deep/ref alt', function (st) {
-        st.plan(4);
+        st.plan(8);
 
         var pathFilter = pathFilterFactory(st);
 
+        var res = resolve.sync(
+            'deep/ref',
+            { basedir: resolverDir, pathFilter: pathFilter }
+        );
+        st.equal(res, path.join(resolverDir, 'node_modules/deep/alt.js'));
+
         resolve(
             'deep/ref',
             { basedir: resolverDir, pathFilter: pathFilter },
             function (err, res, pkg) {
                 if (err) st.fail(err);
                 st.equal(res, path.join(resolverDir, 'node_modules/deep/alt.js'));
+                st.end();
             }
         );
     });

From dc23387adb93f497d67def7ee99fae48e5958fb3 Mon Sep 17 00:00:00 2001
From: Bogdan Luca <luca.bogdan@gmail.com>
Date: Wed, 29 Nov 2017 13:47:34 +0200
Subject: [PATCH 2/3] Made loadAsFileSync() work the same as async
 loadAsFile().

---
 lib/sync.js | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/lib/sync.js b/lib/sync.js
index aa2359b3..c404d233 100644
--- a/lib/sync.js
+++ b/lib/sync.js
@@ -44,6 +44,16 @@ module.exports = function (x, options) {
     throw err;
 
     function loadAsFileSync(x) {
+        var pkg = loadpkg(path.dirname(x));
+
+        if (pkg && pkg.dir && pkg.pkg && opts.pathFilter) {
+            var rfile = path.relative(pkg.dir, x);
+            var r = opts.pathFilter(pkg.pkg, x, rfile);
+            if (r) {
+                x = path.resolve(pkg.dir, r);
+            }
+        }
+
         if (isFile(x)) {
             return x;
         }
@@ -56,6 +66,30 @@ module.exports = function (x, options) {
         }
     }
 
+    function loadpkg(dir) {
+        if (dir === '' || dir === '/' || (/[/\\]node_modules[/\\]*$/).test(dir)) {
+            return null;
+        }
+
+        var pkgfile = path.join(dir, 'package.json');
+
+        if (!isFile(pkgfile)) {
+            return loadpkg(path.dirname(dir));
+        }
+
+        var body = readFileSync(pkgfile);
+
+        try {
+            var pkg = JSON.parse(body);
+        } catch (jsonErr) {}
+
+        if (pkg && opts.packageFilter) {
+            pkg = opts.packageFilter(pkg, pkgfile);
+        }
+
+        return { pkg: pkg, dir: dir };
+    }
+
     function loadAsDirectorySync(x) {
         var pkgfile = path.join(x, '/package.json');
         if (isFile(pkgfile)) {

From c449d4809cf8461a3d54e458780902b95119a969 Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Wed, 4 Apr 2018 19:46:10 -0700
Subject: [PATCH 3/3] Minor cleanup

---
 lib/sync.js     | 8 +++++---
 readme.markdown | 6 ++++++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/lib/sync.js b/lib/sync.js
index c404d233..2e0d5f24 100644
--- a/lib/sync.js
+++ b/lib/sync.js
@@ -50,7 +50,7 @@ module.exports = function (x, options) {
             var rfile = path.relative(pkg.dir, x);
             var r = opts.pathFilter(pkg.pkg, x, rfile);
             if (r) {
-                x = path.resolve(pkg.dir, r);
+                x = path.resolve(pkg.dir, r); // eslint-disable-line no-param-reassign
             }
         }
 
@@ -67,9 +67,11 @@ module.exports = function (x, options) {
     }
 
     function loadpkg(dir) {
-        if (dir === '' || dir === '/' || (/[/\\]node_modules[/\\]*$/).test(dir)) {
-            return null;
+        if (dir === '' || dir === '/') return;
+        if (process.platform === 'win32' && (/^\w:[/\\]*$/).test(dir)) {
+            return;
         }
+        if (/[/\\]node_modules[/\\]*$/.test(dir)) return;
 
         var pkgfile = path.join(dir, 'package.json');
 
diff --git a/readme.markdown b/readme.markdown
index a5decddd..b59f2ab9 100644
--- a/readme.markdown
+++ b/readme.markdown
@@ -115,6 +115,12 @@ options are:
 
 * `opts.packageFilter(pkg, pkgfile)` - transform the parsed package.json contents before looking at the "main" field
 
+* `opts.pathFilter(pkg, path, relativePath)` - transform a path within a package
+  * pkg - package data
+  * path - the path being resolved
+  * relativePath - the path relative from the package.json location
+  * returns - a relative path that will be joined from the package.json location
+
 * opts.paths - require.paths array to use if nothing is found on the normal `node_modules` recursive walk (probably don't use this)
 
 * opts.moduleDirectory - directory (or directories) in which to recursively look for modules. default: `"node_modules"`