[Bug]: The source code is indented to 4 Spaces, babel translated into 2

[peacejj]

💻

• Would you like to work on a fix?

How are you using Babel?

@babel/cli

Input code

var babel = require("@babel/core");
var code = `
    var a = {
        name: '',
        age: '',
    };
`;

const result = babel.transform(code, {
    retainLines: true,
    compact: false,
    configFile: false,
    babelrc: false,
    comments: true,
    ast: true,
});
console.log(result.code);

Configuration file name

No response

Configuration

No response

Current and expected behavior

The source code is indented to 4 Spaces, babel translated into 2, how can you keep the source code format?

This is the compiled result：

var a = {
  name: '',
  age: ''
};

I was hoping：

    var a = {
        name: '',
        age: '',
    };

Environment

"@babel/core": "^7.22.10",

Possible solution

No response

Additional context

No response

[babel-bot]

Hey @peacejj! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack community that typically always has someone willing to help. You can sign-up here for an invite.

[liuxingbaoyu]

babel/packages/babel-generator/src/index.ts

Line 39 in 5c246ea

style: " ",

I'm surprised this is private.

Currently Babel does not support this.

[nicolo-ribaudo]

Babel does not attempt in any way to preserve the original formatting. I suggest running Babel's output through prettier, eslint --fix, or another formatter.

Another roption is to try using Recast with Babel: I did something similar at https://github.com/nicolo-ribaudo/codemods/blob/40e90e3ad6e2db91fd7756bcce68bfefd373a3a3/src/utils.js#L32

[coderaiser]

Recast is not maintained, you can use @putout/printer it is made for Babel AST and has lots of configurations.