make this work with webpack

lib/node-pre-gyp.js

@@ -58,6 +58,13 @@ Object.defineProperty(exports, 'find', {
   enumerable: true
 });
 
+Object.defineProperty(exports, 'findUsingPackageJson', {
+  get: function() {
+    return require('./pre-binding').findUsingPackageJson;
+  },
+  enumerable: true
+});
+
 // in the following, "my_module" is using node-pre-gyp to
 // prebuild and install pre-built binaries. "main_module"
 // is using "my_module".

lib/pre-binding.js

@@ -14,6 +14,16 @@ exports.validate = function(package_json, opts) {
   versioning.validate_config(package_json, opts);
 };
 
+exports.findUsingPackageJson = function (package_json, opts) {
+  versioning.validate_config(package_json, opts);
+  let napi_build_version;
+  if (napi.get_napi_build_versions(package_json, opts)) {
+    napi_build_version = napi.get_best_napi_build_version(package_json, opts);
+  }
+
+  return versioning.evaluate(package_json, opts, napi_build_version);
+};
+
 exports.find = function(package_json_path, opts) {
   if (!existsSync(package_json_path)) {
     throw new Error(package_json_path + 'does not exist');
@@ -22,13 +32,8 @@ exports.find = function(package_json_path, opts) {
   prog.setBinaryHostProperty();
   const package_json = prog.package_json;
 
-  versioning.validate_config(package_json, opts);
-  let napi_build_version;
-  if (napi.get_napi_build_versions(package_json, opts)) {
-    napi_build_version = napi.get_best_napi_build_version(package_json, opts);
-  }
   opts = opts || {};
   if (!opts.module_root) opts.module_root = path.dirname(package_json_path);
-  const meta = versioning.evaluate(package_json, opts, napi_build_version);
-  return meta.module;
+
+  return exports.findUsingPackageJson(package_json, opts).module;
 };

lib/util/versioning.js

@@ -315,14 +315,14 @@ module.exports.evaluate = function(package_json, options, napi_build_version) {
   const validModuleName = opts.module_name.replace('-', '_');
   const host = process.env['npm_config_' + validModuleName + '_binary_host_mirror'] || package_json.binary.host;
   opts.host = fix_slashes(eval_template(host, opts));
-  opts.module_path = eval_template(package_json.binary.module_path, opts);
+  opts.module_relative_path = eval_template(package_json.binary.module_path, opts);
   // now we resolve the module_path to ensure it is absolute so that binding.gyp variables work predictably
   if (options.module_root) {
     // resolve relative to known module root: works for pre-binding require
-    opts.module_path = path.join(options.module_root, opts.module_path);
+    opts.module_path = path.join(options.module_root, opts.module_relative_path);
   } else {
     // resolve relative to current working directory: works for node-pre-gyp commands
-    opts.module_path = path.resolve(opts.module_path);
+    opts.module_path = path.resolve(opts.module_relative_path);
   }
   opts.module = path.join(opts.module_path, opts.module_name + '.node');
   opts.remote_path = package_json.binary.remote_path ? drop_double_slashes(fix_slashes(eval_template(package_json.binary.remote_path, opts))) : default_remote_path;

test/app1/index.js

@@ -3,4 +3,12 @@ var path = require('path')
 var binding_path = binary.find(path.resolve(path.join(__dirname,'./package.json')));
 var binding = require(binding_path);
 
-require('assert').equal(binding.hello(),"hello");
+require('assert').equal(binding.hello(),"hello");
+
+var binding_path_using_package_json = binary.findUsingPackageJson(require('./package.json'));
+var binding_using_package_json = require('./' + path.join(
+  binding_path_using_package_json.module_relative_path, 
+  binding_path_using_package_json.module_name
+) + '.node');
+
+require('assert').equal(binding_using_package_json.hello(),"hello");