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node_modules/resolve/lib/node-modules-paths.js

@@ -1,30 +1,11 @@
 var path = require('path');
-var fs = require('fs');
 var parse = path.parse || require('path-parse');
 
-module.exports = function nodeModulesPaths(start, opts) {
-    var modules = opts && opts.moduleDirectory
-        ? [].concat(opts.moduleDirectory)
-        : ['node_modules'];
-
-    // ensure that `start` is an absolute path at this point,
-    // resolving against the process' current working directory
-    var absoluteStart = path.resolve(start);
-
-    if (opts && opts.preserveSymlinks === false) {
-        try {
-            absoluteStart = fs.realpathSync(absoluteStart);
-        } catch (err) {
-            if (err.code !== 'ENOENT') {
-                throw err;
-            }
-        }
-    }
-
+var getNodeModulesDirs = function getNodeModulesDirs(absoluteStart, modules) {
     var prefix = '/';
-    if (/^([A-Za-z]:)/.test(absoluteStart)) {
+    if ((/^([A-Za-z]:)/).test(absoluteStart)) {
         prefix = '';
-    } else if (/^\\\\/.test(absoluteStart)) {
+    } else if ((/^\\\\/).test(absoluteStart)) {
         prefix = '\\\\';
     }
 
@@ -35,11 +16,27 @@ module.exports = function nodeModulesPaths(start, opts) {
         parsed = parse(parsed.dir);
     }
 
-    var dirs = paths.reduce(function (dirs, aPath) {
+    return paths.reduce(function (dirs, aPath) {
         return dirs.concat(modules.map(function (moduleDir) {
             return path.join(prefix, aPath, moduleDir);
         }));
     }, []);
+};
 
+module.exports = function nodeModulesPaths(start, opts, request) {
+    var modules = opts && opts.moduleDirectory
+        ? [].concat(opts.moduleDirectory)
+        : ['node_modules'];
+
+    if (opts && typeof opts.paths === 'function') {
+        return opts.paths(
+            request,
+            start,
+            function () { return getNodeModulesDirs(start, modules); },
+            opts
+        );
+    }
+
+    var dirs = getNodeModulesDirs(start, modules);
     return opts && opts.paths ? dirs.concat(opts.paths) : dirs;
 };