esbuild

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The ClI works

❯ npx esbuild --serve --bundle index.js --outdir=a

 > Local:   http://127.0.0.1:8000/
 > Network: http://10.9.8.45:8000/

The API doesn't output anything:

❯ WATCH=true node esbuild.config.mjs
// nothing

//esbuild.config.mjs
import process from 'node:process';
import esbuild from 'esbuild';

const serve = {
	servedir: 'public',
};
const build = {
	entryPoints: ['index.js'],
	outdir: 'public',
	logLevel: 'info',
};

if (process.env.WATCH === 'true') {
	await esbuild.serve(serve, build);
} else {
	await esbuild.build(build);
}

Any config to make it work? Or is this functionality missing?

The CLI just calls the public API like you are doing, and then pretty-prints the returned address and port:

https://github.com/evanw/esbuild/blob/f730c03dc7be43c3c908fbd6e106120a99ebb4a0/pkg/cli/cli_impl.go#L1320-L1355

You are welcome to print it yourself if you'd like, using whatever formatting you want. The host and port are returned from serve here:

https://github.com/evanw/esbuild/blob/f730c03dc7be43c3c908fbd6e106120a99ebb4a0/lib/shared/types.ts#L238-L244

This is documented here: https://esbuild.github.io/api/#serve-return-values

Thank you for the solution, but that feels like I’m rewriting core functionality and it’s not super straightforward either https://thewebdev.info/2022/02/26/how-to-get-local-ip-address-in-node-js/