Business background 
- 
 vue-cli3 some of the official predefined templates cannot meet their needs
-  for example, I have common tool libraries, sass styles, and generic ui components that need to be built into templates 
-  so configure  preset yourself.
 problems encountered 
-  the official document says that the  render function in generator.js can generate the specified file into the project
-  but I wrote with reference to the official example
-  the final generated project does not contain some of my preset files 
-  that is, none of the files under the template directory have been copied 
 the following is the project file 
 t/preset.json 
{
  "plugins": {}
}
 t/generator.js 
module.exports = api => {
  console.log(123123123123);
  api.render("./template");
};
 t/template 
- src
  - layouts
    - test.js
  - test.js
- test.js
 troubleshooting 
 -  there is an output of 123123123123 at the terminal, indicating that generator is executed