Bootstrap 4 - offcanvas menu compiler erros FIXED

[pedroscursel]

Hello Guys,
I will have the same error related here, but i Fix it adding some var's on the scope of my "build.scss".

In my case, I only need the canvas menu effect, so, I start to import the source to my file build.scss.

@import './node_modules/jasny-bootstrap/scss/variables'; 
@import './node_modules/jasny-bootstrap/scss/grid-container-smooth'; 
@import './node_modules/jasny-bootstrap/scss/navmenu'; 
@import './node_modules/jasny-bootstrap/scss/offcanvas';

But it aways crashed my compiler (webpack or gulp).
So I followed the erros and start to add the missed vars directly on my build.scss:

$grid-float-breakpoint:     	                768px;
$grid-gutter-width:       		        30px;
$screen-xs:             		 	480px;
$screen-sm:              			768px;
$screen-md:              			992px;
$screen-lg:              			1200px;
$screen-xs-min:          			$screen-xs;
$screen-sm-min:          			$screen-sm;
$screen-md-min:          			$screen-md;
$screen-lg-min:          			$screen-lg;
$screen-xs-max:          			($screen-sm-min - 1);
$screen-sm-max:          			($screen-md-min - 1);
$screen-md-max:          			($screen-lg-min - 1);
$container-lg:              	                ((1140px + $grid-gutter-width));
$container-smooth:          	                $container-lg;
$navbar-padding-horizontal: 	                floor(($grid-gutter-width / 2)) !default;
$border-radius-base:    			4px !default;
$font-size-base:          		        14px !default;
$font-size-large:         		        ceil(($font-size-base * 1.25)) !default; // ~18px
$font-size-small:         		        ceil(($font-size-base * 0.85)) !default; // ~12px
$line-height-base:    			        1.428571429 !default; 
$line-height-computed:			        floor(($font-size-base * $line-height-base)) !default; 

@import './node_modules/jasny-bootstrap/scss/variables'; 
@import './node_modules/jasny-bootstrap/scss/grid-container-smooth'; 
@import './node_modules/jasny-bootstrap/scss/navmenu'; 
@import './node_modules/jasny-bootstrap/scss/offcanvas';

And the code WORKS PERFECTLY!
So, I hope it help you guys :)

### tip for beginners: My build.scss file, has the bootstrap 4 imported (by demand, but is no problem if you have all bootstrap.scss source). Don't forget it, without bootstrap, it not works!