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Shiono Yoshihide

Posted on Nov 15, 2018

Why Babel with TypeScript?

#babel #typescript #javascript #webpack

At first, I wonder why Babel supports TypeScript.
And I can't imagine how to use TypeScript within Babel.

This article explains how I use TypeScript within Babel and Webpack.

TLDR

See this webpack.config.js:

module.exports = {
  resolve: {
    extensions: ['.js', '.jsx', '.ts', '.tsx']
  },
  module: {
    rules: [
      {
        test: [/\.jsx?$/, /\.tsx?$/],
        use: 'babel-loader',
        exclude: /node_modules/
      }
    ]
  }
}

Use babel-loader to /\.tsx?$/ same as /\.jsx?$/ ?!

Yes, babel-loader. I explain how to acheive this step by step.

How it works?

So simple.

Thanks to @babel/preset-typescript, we can handle /\.tsx?$/ by babel-loader.

See .babelrc below:

{
  "presets": [
    "@babel/typescript"
  ],
  "plugins": [
    "@babel/proposal-class-properties",
    "@babel/proposal-object-rest-spread"
  ]
}

Demo

saltyshiomix / webpack-typescript-react-starter

Webpack + TypeScript + React = ❤️

As of Babel v7, now we can handle .ts or .tsx files same as .js or .jsx files like this:

// webpack.config.js

module.exports = {
  resolve: {
    extensions: ['.js', '.jsx', '.ts', '.tsx'],
  },
  module: {
    rules: [
      {
        test: [/\.jsx?$/, /\.tsx?$/],
        use: 'babel-loader',
        exclude: /node_modules/,
      },
    ],
  },
}

Use babel-loader to /\.tsx?$/ ?!

Yes, babel-loader. See .babelrc:

{
  "presets": [
    "@babel/env",
    "@babel/react",
    "@babel/typescript"
  ]
}

Thanks to @babel/preset-typescript, we can handle /\.tsx?$/ files same as /\.jsx?$/ files :)

Usage

# installation
$ yarn
# development mode
# it automatically opens `http://localhost:8080` in your default browser,
# and you'll see

…

View on GitHub

package.json is so simple and so you can imagine how to use:

{
  "name": "babel-typescript-react-boilerplate",
  "scripts": {
    "check-types": "tsc",
    "start": "webpack-dev-server --mode development"
  },
  "dependencies": {
    "react": "^16.6.3",
    "react-dom": "^16.6.3"
  },
  "devDependencies": {
    "@babel/core": "^7.1.6",
    "@babel/plugin-proposal-class-properties": "^7.1.0",
    "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
    "@babel/preset-env": "^7.1.6",
    "@babel/preset-react": "^7.0.0",
    "@babel/preset-typescript": "^7.1.0",
    "@types/react": "^16.7.6",
    "@types/react-dom": "^16.0.9",
    "babel-loader": "^8.0.4",
    "html-webpack-plugin": "^3.2.0",
    "typescript": "^3.1.6",
    "webpack": "^4.25.1",
    "webpack-cli": "^3.1.2",
    "webpack-dev-server": "^3.1.10"
  }
}