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.

TOC

• Enabled proposal plugins
• Install
• Options
• Usage
  • Via .babelrc (Recommended)
  • Via CLI
  • Via Node API
  • Via webpack

Enabled proposal plugins

1. class-properties
2. do-expressions
3. function-bind
4. function-sent
5. json-strings
6. logical-assignment-operators
7. nullish-coalescing-operator
8. optional-chaining
9. partial-application
10. pipeline-operator
11. private-methods
12. throw-expressions
13. v8intrinsic - Further Detail

Install

# yarn
yarn add -D babel-preset-proposal-typescript

# npm
npm i -D babel-preset-proposal-typescript

Options

option	description	defaults
classLoose	whether to use loose mode for class properties and private methods	true
decoratorsBeforeExport	See Babel Document	N/A
decoratorsLegacy	whether to use legacy decorators semantic	true
isTSX	whether to enable jsx plugin with typescript	false, true but for /\.[jt]sx$/
pipelineOperator	implementation of pipeline operator	"minimal"

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'],
      },
    },
  ],
}