From ff6b25d6b5511d8a92930da41db73b93eb1d6cf8 Mon Sep 17 00:00:00 2001
From: Ben Newman <bn@cs.stanford.edu>
Date: Sat, 27 Feb 2016 17:39:10 -0500
Subject: [PATCH] Implement require.resolve.

---
 install.js  | 6 ++++++
 test/run.js | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/install.js b/install.js
index 85e8dc8..6d57a0b 100644
--- a/install.js
+++ b/install.js
@@ -95,6 +95,12 @@ makeInstaller = function (options) {
       throw error;
     }
 
+    require.resolve = function (id) {
+      var f = fileResolve(file, id);
+      if (f) return f.m.id;
+      throw new Error("Cannot find module '" + id + "'");
+    };
+
     // A function that immediately returns true iff all the transitive
     // dependencies of the module identified by id have been installed.
     // This function can be used with options.onInstall to implement
diff --git a/test/run.js b/test/run.js
index c328f77..693a544 100644
--- a/test/run.js
+++ b/test/run.js
@@ -408,6 +408,10 @@ describe("install", function () {
 
     assert.strictEqual(require.ready("./dir/d"), true);
     assert.strictEqual(require("./dir/d").id, "/dir/node_modules/e.js");
+    assert.strictEqual(
+      require.resolve("./dir/d"),
+      "/dir/node_modules/e.js"
+    );
   });
 
   it("avoids circular package.json resolution chains", function () {