# babel-udf-helpers

A tool to create user-defined helpers that can be used in your babel plugin.
The usability is like that of @babel/helpers.

# 📦 Installation

npm install --save-dev babel-udf-helpers

# ❤️ Support Version

node.js (>=10.15)
typescript target (ES2018)

# 📖 Usage

Use in your babel plugin as follows.
It works the same as babel-helpers addHelper, so you can use it anywhere in your visitor.

import { useDangerousUDFHelpers } from 'babel-udf-helpers';
import helpers from './helpers';

export default function({types: t}){
  pre(){
    useDangerousUDFHelpers(this, { helpers });
  },
  visitor: {
    Program(path){
      this.addUDFHelper("programHelper")
    },
    ImportDeclaration(path) {
      this.addUDFHelper("importHelper")
    }
  }
}

helpers.js looks like the following.

import { helper } from 'babel-udf-helpers';

const helpers = Object.create(null);
export default helpers;

helpers.programHelper = helper`
  export default function _programHelper(){
    return "programHelper";
  };
`

helpers.importHelper = helper`
  export default function _importHelper(){
    return "importHelper";
  };
`

# ⚽ Example

Run the plugin test with babel-udf-helpers in typescript and javascript.

{
  make all-deps
  make example-test
}

# 📝 License

The gem is available as open source under the terms of the MIT License.

# 🤝 Contributing

Fork it ( http://github.com/yukihirop/babel-udf-helpers/fork )
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create new Pull Request

Motivation →