build.js

const esbuild = require('esbuild');

const production =
	process.argv.findIndex((argItem) => argItem === '--mode=production') >= 0;

const onRebuild = (context) => {
	return async (err, res) => {
		if (err) {
			return console.error(`[${context}]: Rebuild failed`, err);
		}

		console.log(`[${context}]: Rebuild succeeded, warnings:`, res.warnings);
	};
};

const server = {
	platform: 'node',
	target: ['node16'],
	format: 'cjs',
};

const client = {
	platform: 'browser',
	target: ['chrome93'],
	format: 'iife',
};

for (const context of ['client', 'server']) {
	esbuild
		.build({
			bundle: true,
			entryPoints: [`${context}/${context}.ts`],
			outfile: `dist/${context}.js`,
			watch: production
				? false
				: {
						onRebuild: onRebuild(context),
					},
			...(context === 'client' ? client : server),
		})
		.then(() => console.log(`[${context}]: Built successfully!`))
		.catch(() => process.exit(1));
}