return empty __get__ function if path is not valid yet

Author: ShMcK

lib/__get__.js

@@ -9,16 +9,17 @@
  * @throws {TypeError}
  * @return {*}
  */
-function __get__() {
-    arguments.varName = arguments[0];
+function __get__(varName) {
     try {
-        if (arguments.varName && typeof arguments.varName === "string") {
-            return eval(arguments.varName);
+        if (varName && typeof varName === "string") {
+            return eval(varName);
         } else {
             throw new TypeError("__get__ expects a non-empty string");
         }
     } catch(e) {
-        return;
+        return {
+          __get__: () => {}
+        }
     }
 }
 

lib/__set__.js

@@ -1,13 +1,9 @@
 "use strict";
 
 var __get__ = require("./__get__.js");
-var __set__ = require ("./__set__.js");
-var __with__ = require("./__with__.js");
 
 var srcs = {
     "__get__": __get__.toString(),
-    "__set__": __set__.toString(),
-    "__with__": __with__.toString()
 };
 
 function getDefinePropertySrc() {

lib/__with__.js

@@ -1,4 +1,21 @@
 var rewireModule = require("./rewire.js");
+var fs = require('fs');
+
+function fileExists(path, silent) {
+    if (silent === void 0) { silent = true; }
+    try {
+        fs.accessSync(path, fs.F_OK);
+    }
+    catch (e) {
+        if (e) {
+            if (!silent) {
+                console.log(e);
+            }
+            return false;
+        }
+    }
+    return true;
+}
 
 /**
  * Adds a special setter and getter to the module located at filename. After the module has been rewired, you can
@@ -8,9 +25,20 @@ var rewireModule = require("./rewire.js");
  * @return {*} the rewired module
  */
 function rewire(filename) {
-    return rewireModule(module.parent, filename);
+  // is not a package path
+  if (!filename.match(/^[a-zA-Z]/)) {
+    // if the file doesn't exist yet,
+    // set to get undefined
+    if (!fileExists(filename)) {
+      return {
+        __get__: () => {}
+      };
+    }
+  }
+  // proceed with rewiring
+  return rewireModule(module.parent, filename);
 }
 
 module.exports = rewire;
 
-delete require.cache[__filename];   // deleting self from module cache so the parent module is always up to date
+delete require.cache[__filename];   // deleting self from module cache so the parent module is always up to date