Since Rollup@^2.39.0, the cjs output for re-exports has changed a bit:

Object.keys(foo).forEach(function (k) {
-	if (k !== 'default') Object.defineProperty(exports, k, {
+       if (k !== 'default' && !exports.hasOwnProperty(k)) Object.defineProperty(exports, k, {
		enumerable: true,
		get: function () {
			return foo[k];
		}
	});
});

The extra hasOwnProperty check breaks re-exports detection of cjs-module-lexer.

The implication of this:

• cjs-module-lexer is used in Node.js' ESM mode to detect named exports compatibility for CJS modules
• Many packages use Rollup to bundle for CJS distribution (e.g. Vue 3.0)
• Previously, these packages "just worked" for named imports from Node.js in ESM mode because cjs-module-lexer was able to detect the re-exports
• After upgrading Rollup to 2.39.0, the named imports are broken.

Reproduction

https://github.com/yyx990803/cjs-module-lexer-rollup-reexports

• Install deps
• npm run build (which builds src/index.js with Rollup to out.js)
• node lex.js (which runs cjs-module-lexer on out.js)