https://github.com/Rich-Harris/esrap

Parse in reverse
https://github.com/Rich-Harris/esrap

Last synced: 3 months ago
JSON representation

Parse in reverse

• Host: GitHub
• URL: https://github.com/Rich-Harris/esrap
• Owner: Rich-Harris
• License: mit
• Created: 2023-09-17T00:37:36.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2024-04-30T13:48:19.000Z (7 months ago)
• Last Synced: 2024-05-02T07:57:24.461Z (7 months ago)
• Language: JavaScript
• Size: 444 KB
• Stars: 39
• Watchers: 5
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# esrap

Parse in reverse. AST goes in, code comes out.

## Usage

```js

import { print } from 'esrap';

const { code, map } = print({

  type: 'Program',

  body: [

    {

      type: 'ExpressionStatement',

      expression: {

        callee: {

          type: 'Identifier',

          name: 'alert'

        },

        arguments: [

          {

            type: 'Literal',

            value: 'hello world!'

          }

        ]

      }

    }

  ]

});

console.log(code); // alert('hello world!');

```

If the nodes of the input AST have `loc` properties (e.g. the AST was generated with [`acorn`](https://github.com/acornjs/acorn/tree/master/acorn/#interface) with the `locations` option set), sourcemap mappings will be created.

## Options

You can pass information that will be added to the resulting sourcemap (note that the AST is assumed to come from a single file):

```js

const { code, map } = print(ast, {

  sourceMapSource: 'input.js',

  sourceMapContent: fs.readFileSync('input.js', 'utf-8')

});

```

## Why not just use Prettier?

Because it's ginormous.

## Developing

This repo uses [Bun](https://bun.sh/). Once it's installed, do `bun install` to install dependencies, and `bun test` to run the tests.

## License

[MIT](LICENSE)