class Promisify

That can be used to declare custom promisified variants of functions, see Custom promisified functions.

See also:

• https://nodejs.org/api/util.html#util_util_promisify_custom

Takes a function following the common error-first callback style, i.e. taking an (err, value) => ... callback as the last argument, and returns a version that returns promises.

See also:

• https://nodejs.org/api/util.html#util_util_promisify_original