esm-loader-typescript
Node.js ESModule Loader for importing and loading
Typescript (.ts) files and transpiling on the fly.
Warning! Using experimental Node.js features and flags, API will likely change. This may be helpful for development and testing, but should not be used in production.
Usage
npm install --save-dev esm-loader-typescriptWe want to import a .ts file with Node.js:
// index.ts
const words: string = 'hello'
console.log(words)
// 'hello'Standalone
# node >= 20.7
cat << EOF > ./register.js
import { register } from 'node:module'
register('esm-loader-typescript', import.meta.url)
EOF
NODE_OPTIONS="--import ./register.js" node index.ts
# node < 20.7
NODE_OPTIONS="--loader esm-loader-typescript" node index.tsChainable
This loader can be configured, and chained with other loaders, using node-esm-loader.
npm install --save-dev node-esm-loader// .loaderrc.js
export default {
loaders: ['esm-loader-typescript'],
}# node >= 20.7
NODE_OPTIONS="--import node-esm-loader/register" node index.ts
# node < 20.7
NODE_OPTIONS="--loader node-esm-loader" node index.tsOptions
Config
You may specify a custom TypeScript config filename to use:
// .loaderrc.js
export default {
loaders: [
{
loader: 'esm-loader-typescript',
options: {
config: 'tsconfig-custom.json',
},
},
],
}Otherwise, if a tsconfig.json file is found, it will be loaded and used.
Debug
// .loaderrc.js
export default {
loaders: [
{
loader: 'esm-loader-typescript',
options: {
debug: true,
},
},
],
}