function Deno.realPathSync
realPathSync(path: string | URL): string
Synchronously returns absolute normalized path, with symbolic links
resolved.
```ts
// e.g. given /home/alice/file.txt and current directory /home/alice
Deno.symlinkSync("file.txt", "symlink_file.txt");
const realPath = Deno.realPathSync("./file.txt");
const realSymLinkPath = Deno.realPathSync("./symlink_file.txt");
console.log(realPath); // outputs "/home/alice/file.txt"
console.log(realSymLinkPath); // outputs "/home/alice/file.txt"
```
Requires `allow-read` permission for the target path.
Also requires `allow-read` permission for the `CWD` if the target path is
relative.
string