babel-preset-proposal-typescript

babel-preset-proposal-typescript

Yet another Babel preset for TypeScript, only transforms proposals which TypeScript does not support now.

So that you can use babel to transform proposals which are current in stage 0-2 and TypeScript team will not implement them temporarily.

Enabled proposal plugins

1. do-expressions
2. function-bind
3. function-sent
4. nullish-coalescing-operator
5. numeric-separator
6. optional-chaining
7. pipeline-operator
8. throw-expressions
9. unicode-property-regex

Install

npm install --save-dev babel-preset-proposal-typescript # npm
yarn add -D babel-preset-proposal-typescript # yarn

Usage

Via .babelrc (Recommended)

.babelrc

{
  "presets": ["proposal-typescript"]
}

Via CLI

babel input.ts --presets proposal-typescript > output.ts

Via Node API

require("@babel/core").transform("code", {
  presets: ["proposal-typescript"]
});

Via webpack

Pipe codes through babel-loader to ts-loader or awesome-typescript-loader.

loader = {
  test: /\.ts$/,
  use: [{
    loader: 'ts-loader'
  }, {
    loader: 'babel-loader',
    options: {
      presets: ['proposal-typescript']
    }
  }]
}