build: tsup for better cjs / esm support

tsup.config.js

@@ -0,0 +1,35 @@
+import { defineConfig } from 'tsup';
+
+export function createTsupConfig({
+	entry = ['src/index.ts'],
+	external = [],
+	noExternal = [],
+	platform = 'node',
+	format = ['esm', 'cjs'],
+	target = 'es2022',
+	skipNodeModulesBundle = true,
+	clean = true,
+	shims = true,
+	minify = false,
+	splitting = false,
+	keepNames = true,
+	dts = true,
+	sourcemap = true,
+} = {}) {
+	return defineConfig({
+		entry,
+		external,
+		noExternal,
+		platform,
+		format,
+		skipNodeModulesBundle,
+		target,
+		clean,
+		shims,
+		minify,
+		splitting,
+		keepNames,
+		dts,
+		sourcemap,
+	});
+}