throw no-base error in JS

No need to go to C++ for this.

Author: TimothyGu

lib/internal/loader/search.js

@@ -7,7 +7,11 @@ const {Error, JSON: {stringify: JSONStringify}} = global;
 
 module.exports = (target, base) => {
   target = `${target}`;
-  base = base !== undefined ? `${base}` : undefined;
+  if (base === undefined) {
+    // We cannot search without a base.
+    throw new Error('module not found');
+  }
+  base = `${base}`;
   try {
     return resolve(target, base);
   } catch (e) {

src/loader/module_wrap.cc

@@ -478,8 +478,7 @@ void ModuleWrap::Resolve(const FunctionCallbackInfo<Value>& args) {
   Utf8Value specifier_utf(env->isolate(), args[0]);
 
   if (!args[1]->IsString()) {
-    // No base available.
-    env->ThrowError("module not found");
+    env->ThrowError("second argument is not a string");
     return;
   }
   Utf8Value url_utf(env->isolate(), args[1]);