[Bug]: CJS-ESM interop - property assignment on CJS module exports #7973
Description
Reproduction link or steps
https://github.com/jamesopstad/rolldown-assignment-repro
What is expected?
var import_src = /* @__PURE__ */ __toESM(require_cjs_module(), 1);
import_src.default.log = (...args) => { ... }; // Works - accesses actual module.exports
(0, import_src.default)("test"); // WorksWhat is actually happening?
var import_src = /* @__PURE__ */ __toESM(require_cjs_module(), 1);
import_src.log = (...args) => { ... }; // FAILS - getter-only property
(0, import_src.default)("test"); // Works - uses .defaultSystem Info
System:
OS: macOS 26.2
CPU: (12) arm64 Apple M3 Pro
Memory: 7.00 GB / 36.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 24.2.0 - /Users/jopstad/.nvm/versions/node/v24.2.0/bin/node
Yarn: 1.22.22 - /Users/jopstad/.nvm/versions/node/v24.2.0/bin/yarn
npm: 11.3.0 - /Users/jopstad/.nvm/versions/node/v24.2.0/bin/npm
pnpm: 10.15.1 - /Users/jopstad/.nvm/versions/node/v24.2.0/bin/pnpm
bun: 1.3.1 - /Users/jopstad/.bun/bin/bun
Browsers:
Chrome: 143.0.7499.193
Safari: 26.2
npmPackages:
rolldown: 1.0.0-beta.60 => 1.0.0-beta.60Any additional comments?
More info in the reproduction README.