# types.ProgramResult.stderr

- **Module:** types
- **Package:** libtmux
- **Language:** TypeScript
- **Kind:** property
- **Source:** https://github.com/libtmux/libtmux-ts/blob/073b9d7dedad900bff6f5ec0ea47794e40225870/packages/libtmux/src/types.ts#L671
- **Page:** https://libtmux.org/en/ts/latest/reference/types-programresult-stderr/

What the program wrote to stderr, as written, when [`separateStderr`](/en/ts/latest/reference/types-runoptions-separatestderr/) was set.