Add Vim syntax highlighting

The following code doesn't work as expected:

" Vim syntax file
" Language: Better TlDr
" Maintainer: Emily Grace Seville
" Latest Revision: 23 January 2023

if exists("b:current_syntax")
  finish
endif

let b:current_syntax = "btldr"

syntax match linePrefix '^[-#>]'
syntax match url 'https:[^ ]+'
syntax match option '--?[^ =]+=?'

syntax keyword placeholderType bool int float char string command file directory path any
syntax keyword streamType stdin stdout stderr

highlight def link linePrefix Type
highlight def link url Constant
highlight def link option Type

highlight def link placeholderType Type
highlight def link streamType Type

I don't know how to fix, I definitely need help with syntax highlighting for Vim.

command-line-interface-pages / syntax

Add Vim syntax highlighting #1