It looks like you do not have the SCSS files for Bootstrap and Bootstrap material design in your package? If I compile bootstrap SCSS myself (because altering bunch of variables) - then I have to require it seperatly, right?

Also referring to this question: https://mdbootstrap.com/support/general/question-about-sass-modularity/

My problem is that I do not want to do unecessary imports. Currently I am doing like this:

// this is where we override the Bootstrap and the Bootstrap Material Design variables
@import "variables_bootstrap";
@import "variables_mdb";

// This import is importing bootstrap including bootstrap material design
@import "../../../../node_modules/bootstrap-material-design/scss/core";

// Import MDB Pro - from node_modules/mdbootstrap-pro/scss/mdb.scss

// Bootstrap
@import "../../../../node_modules/mdbootstrap-pro/scss/core/bootstrap/functions";
@import "../../../../node_modules/mdbootstrap-pro/scss/core/bootstrap/variables";
@import "../../../../node_modules/mdbootstrap-pro/scss/core/bootstrap/rfs";

// CORE
@import "../../../../node_modules/mdbootstrap-pro/scss/core/mixins";
// Your custom variables
@import "../../../../node_modules/mdbootstrap-pro/scss/custom-variables";
@import "../../../../node_modules/mdbootstrap-pro/scss/core/colors";
// ... and so on

I think it's totally up to you. Our package always contains a version of Bootstrap that "fits" the version of MDB that you're using. If you wish to install the dependencies separately, feel free to do that, but please keep in mind that version of Bootstrap, jQuery, and Popper should be the same as in our package