## Here is an example for Javascript.

syntax "javascript" "\.js$"
comment "//"

color green "\<(async|class|const|extends|function|let|this|typeof|var|void)\>"
color brightyellow "\<(do|while|if|else|switch|case|default|for|each|in|of|with)\>"
color brightyellow "\<(await|export|import|throw|try|catch|finally|new|delete)\>"
color magenta "\<(break|continue|return|yield)\>"

# Strings.
color brightmagenta ""(\\.|[^"])*"" "'(\\.|[^'])*'" "`(\\.|[^`])*`"
# Comments.
color brightblue "(^|[[:space:]])//.*"
color brightblue start="/\*" end="\*/"

# Trailing whitespace.
color ,green "[[:space:]]+$"