Why press "." does not pop up a prompt

v6
1

When I press the letter or “.”, only the letter prompts

let before = context.matchBefore(/\w*|\./);
    if (before.from == before.to && !context.explicit) return null


return {
        from: before ? before.from : context.pos,
        options: pointComplet.length > 0 ? pointComplet : completions,
        validFor: /^\w*$/
    }