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/** Returns the path to the user's data directory. * * The returned value depends on the operating system and is either a string, * containing a value from the following table, or `null`. * * | Platform | Value                                    | Example                                      | * | -------- | ---------------------------------------- | -------------------------------------------- | * | Linux    | `$XDG_DATA_HOME` or `$HOME`/.local/share | /home/justjavac/.local/share                 | * | macOS    | `$HOME`/Library/Application Support      | /Users/justjavac/Library/Application Support | * | Windows  | `$APPDATA`                               | C:\Users\justjavac\AppData\Roaming           | */export default function dataDir(): string | null {  switch (Deno.build.os) {    case "linux": {      const xdg = Deno.env.get("XDG_DATA_HOME");      if (xdg) return xdg;
      const home = Deno.env.get("HOME");      if (home) return `${home}/.local/share`;      break;    }
    case "darwin": {      const home = Deno.env.get("HOME");      if (home) return `${home}/Library/Application Support`;      break;    }
    case "windows":      return Deno.env.get("APPDATA") ?? null;  }
  return null;}