I have the following file structure:

app
|--zipme
|   |--data (mode 777)
|   |   |--foo.txt (mode 777)

If I ran the follwing code

"use strict";

const tar = require("tar");

tar.c({
    gzip: true,
    file: "arch.tgz",
}, ["zipme"])
.then(() => tar.x({
    cwd: "x",
    file: "arch.tgz",
}))
.then(() => console.log("done!"))
    .catch(err => console.log(err));

the directory x/zipme/data has the mode 755 (probably because of the process umask).
When I run this code again without deleting the output dir (x/zipme) then the data directory gets the mode 777. Is this indented?
I expected the mode of the directory to be mode 777 the first time I run this code.

The same is not true for files. The mode stays unchanged on 755 regardless of how often I run this code.

Is there a way to have the modes of the tar source replicated in the output directory without changing the umask of the process?