# types.SplitOptions.size

- **Module:** types.SplitOptions
- **Package:** @libtmux/libtmux
- **Language:** TypeScript
- **Kind:** property
- **Source:** https://github.com/libtmux/libtmux-ts/blob/2cb93308200da38a26b59876618116850f110607/packages/libtmux/src/types.ts#L262
- **Page:** https://libtmux.org/reference/ts/types-splitoptions-size/

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

`splitSize(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.