# types.SplitOptions.size

- **Module:** types
- **Package:** libtmux
- **Language:** TypeScript
- **Kind:** property
- **Source:** https://github.com/libtmux/libtmux-ts/blob/073b9d7dedad900bff6f5ec0ea47794e40225870/packages/libtmux/src/types.ts#L294
- **Page:** https://libtmux.org/en/ts/latest/reference/types-splitoptions-size/

How big the new pane is, tmux's `-l`.

[`splitSize`](/en/ts/latest/reference/types-splitsize-1ync/)`(20)` authenticates cells along the split's own axis; an exact
`"30%"` literal is that share of the pane. Without it tmux halves the pane.