Workaround to declare a local variable and a local function in a Sass file

// This certainly is not the best way to do this.
// But I couldn't find an approach using the Sass elements for now. If you have a better approach please let me know.

// convention to a local variable
$_local: (
  // some stuff here
);

// if we need to add new entries that depends of the other ones we can do this:
$_local: map-merge(
  $_local,
  (
    // more stuff here
  )
);

// convetion to local functions
@function _local-name-of-the-function (args...) {
  // some stuff here
}

...
...
...

// overriding the definitions
$_local: null;
// unfortunally with this maybe we create several empty functions, but name the function with '_local'
// limits to just one function and the function don't tell us what it does.
@function _local-name-of-the-function () {};