j2ts

A simple java to ts generator, designed for DTO.

• Install
• Js Api
• CLI
• Example
• Development
• Contribution

Install

npm install j2ts

j2ts use javap to extract meta-data of your java classes. So, you need to have it in on your system (installed with jdk).

Js Api

j2ts(path, options)
    .then(res => console.log(res));

• path: string = glob path to java.class(es)
• options: object
  • generateHasClass: boolean = optional, false by default, generate ts file with interface (default) or class
  • dest: string = optional, null by default, destination path to put ts files, if not set, j2ts don't write files

return a promise with an array of {name: className, str: resultTs}.

CLI

After install, add a script in your package.json :

{
    "scripts": {
        "j2ts": "j2ts -f \"[glob]\" -d \"path\""
    }
}

And run npm run j2ts. To see all options run j2ts --help

Example

If you start with User java class :

package dto;
 
public class User {
 
    private String username;
    private Integer stats;
 
    public User() {
    }
 
    public String getUsername() {
            return username;
        }
 
        public void setUsername(String username) {
            this.username = username;
        }
 
    public Integer getStats() {
        return stats;
    }
 
    public void setStats(Integer stats) {
        this.stats = stats;
    }
}

You compile it with java :

javac "dto/User.java"

Pass dto/User.class through j2ts :

j2ts -f "./dto/*.class" -d "./dto"

You will obtain dto/User.ts :

export interface User {
 
    username: string;
 
    stats: number;
 
}

And an index.ts containing a reference to all exported members :

export * from './User';

Now you can use it in your project when you request user from server :

import {User} from './dto';
 
fetch('myserver/user/1').then((user: User) => ...);

Test it against all your big, fat and complicated dto in real projects ;) And please, open issues if something goes wrong.

Development

clone

npm install

npm run test

Contribution

This repository ❤ pull-request ;) Make sure no one else work on same feature by opening an issue!