BrunoLM BrunoLM - 4 months ago 36
Javascript Question

How to setup TypeScript + Babel + Webpack?

I have these dependencies:

"devDependencies": {
"@types/node": "^4.0.27-alpha",
"babel-core": "^6.10.4",
"babel-loader": "^6.2.4",
"babel-polyfill": "^6.9.1",
"babel-preset-es2015": "^6.9.0",
"babel-preset-stage-0": "^6.5.0",
"ts-loader": "^0.8.2",
"typescript": "^2.0.0",
"webpack": "^1.13.1"
}


.babelrc

{
"presets": [
"es2015",
"stage-0"
]
}


tsconfig.json

{
"compilerOptions": {
"module": "commonjs",
"target": "es6",
"noImplicitAny": false,
"sourceMap": false,
"outDir": "built"
},
"exclude": [
"node_modules"
]
}


webpack.config.js

module.exports = {
entry: ['babel-polyfill', './src/'],
output: {
path: __dirname,
filename: './built/bundle.js',
},
resolve: {
modulesDirectories: ['node_modules'],
extensions: ['', '.js', '.ts'],
},
module: {
loaders: [{
test: /\.tsx?$/, loaders: ['ts-loader', 'babel-loader'], exclude: /node_modules/
}],
}
};


/src/index.ts

async function foo() {
const value = await bar();
console.log(value);
}

function bar() {
return new Promise((resolve, reject) => {
return resolve(4);
});
}

(async function run() {
await foo();
}());


With this setup it does work, I can build and run it (logs 4 correctly). However I'm always getting some errors on webpack:

ERROR in ./src/index.ts
(4,32): error TS2304: Cannot find name 'regeneratorRuntime'.

ERROR in ./src/index.ts
(6,12): error TS2304: Cannot find name 'regeneratorRuntime'.

ERROR in ./src/index.ts
(31,451): error TS2346: Supplied parameters do not match any signature of call target.

ERROR in ./src/index.ts
(40,33): error TS2304: Cannot find name 'regeneratorRuntime'.

ERROR in ./src/index.ts
(41,12): error TS2304: Cannot find name 'regeneratorRuntime'.


It seems it has something to do with
babel-polyfill
.

What am I missing?

Answer

(4,32): error TS2304: Cannot find name 'regeneratorRuntime'.

This is a symptom that the output of babel is getting fed to ts. This order is wrong

Fix

Use the setup as described here : http://blog.johnnyreilly.com/2015/12/es6-typescript-babel-react-flux-karma.html

Comments