Fix a tsc error only seen on Travis.
Fix a tsc error only seen on Travis.

westim/Vim,Chillee/Vim,rufusroflpunch/Vim,westim/Vim,Chillee/VSCodeNeovim,Chillee/Vim,VSCodeVim/Vim,VSCodeVim/Vim,Chillee/VSCodeNeovim,rufusroflpunch/Vim,westim/Vim,Chillee/VSCodeNeovim