Merge branch 'main' of https://github.com/pmndrs/koota

Author: krispya

packages/publish/tsup.config.ts

@@ -3,6 +3,18 @@ import { defineConfig } from 'tsup';
 export default defineConfig({
 	entry: ['src/index.ts', 'src/react.ts'],
 	format: ['esm', 'cjs'],
+	// Force emitting "use strict" for ESM output
+	// Not all bundlers and frameworks are capable of correctly transforming esm
+	// to cjs output and koota requires strict mode to be enabled for the code to
+	// be sound. The "use strict" directive has no ill effect when running in an
+	// esm environment, while bringing the extra guarantee of ensuring strict mode
+	// is used in non-conformant environments.
+	// See https://262.ecma-international.org/5.1/#sec-C for more details.
+	esbuildOptions: (options, { format }) => {
+		options.banner = format === 'esm' ? {
+			js: '\"use strict\";',
+		} : undefined;
+	},
 	dts: {
 		resolve: true,
 	},