Only installable on 1 domain

[bilogic]

1. I build the same set of vitepress files and host them on 2 domains (a.com and b.com)
2. In config.ts, I tried to check domain and only call withPwa(...) if on a.com, but PWA still installable on both a.com and b.com

const expectedDomain = "a.com";
if (window.location.hostname == expectedDomain) {
    console.log("Installable because", window.location.hostname);
    final = withPwa(final);
} else console.log("Not installable because", window.location.hostname);

3. Possible to make only PWA show install button only on a.com?