Rollup, Rolldown and tsdown

RollupCopy Anchor Link

Rollup doesn't know whether it builds for the browser or a server, so the plugin defaults to the browser target. Set target: 'server' for a server bundle:

import tyfigo from 'tyfigo/rollup';

export default {
	input: 'src/server.js',
	output: { file: 'dist/server.mjs', format: 'es' },
	external: ['tyfigo/runtime'],
	plugins: [tyfigo({ target: 'server' })],
};

RolldownCopy Anchor Link

Rolldown's platform picks the target: node is a server build, browser (or neutral) a browser build.

import tyfigo from 'tyfigo/rolldown';

export default {
	input: 'src/server.ts',
	platform: 'node',
	output: { file: 'dist/server.mjs', format: 'es' },
	plugins: [tyfigo()],
};

tsdownCopy Anchor Link

tsdown takes Rolldown plugins, and builds for node by default:

import { defineConfig } from 'tsdown';
import tyfigo from 'tyfigo/rolldown';

export default defineConfig({
	entry: ['src/main.ts'],
	plugins: [tyfigo()],
});

None of these have a mode. A browser build uses NODE_ENV at build time, and a server build inlines every environment's layer files and picks them by NODE_ENV when it runs (Server bundles), unless you pass environment. A server build reads .env files and environment variables when it runs, through tyfigo/runtime; keep that import external when the bundle runs next to an installed tyfigo.