fix: allow primitives in NodeJS.Process modifications (#107)

Author: MarshallOfSound

lib/module-declaration.js

@@ -125,7 +125,8 @@ const generateModuleDeclaration = (module, index, API) => {
     if (moduleMethod.returns) {
       returnType = moduleMethod.returns
       // Account for methods on the process module that return a custom type/structure, we need to reference the Electron namespace to use these types
-      if (module.name === 'process' && moduleMethod.returns.type !== 'Object') {
+      if (module.name === 'process' && moduleMethod.returns.type !== 'Object' &&
+          typeof moduleMethod.returns.type === 'string') {
         returnType = `Electron.${moduleMethod.returns.type}`
       }
     }