_box-shadow.scss
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			@mixin box-shadow($shadow...) {
			@if $enable-shadows {
			$result: ();

			@if (length($shadow) == 1) {
			// We can pass `@include box-shadow(none);`
			$result: $shadow;
			} @else {
			// Filter to avoid invalid properties for example `box-shadow: none, 1px 1px black;`
			@for $i from 1 through length($shadow) {
			@if nth($shadow, $i) != "none" {
			$result: append($result, nth($shadow, $i), "comma");
			}
			}
			}
			@if (length($result) > 0) {
			box-shadow: $result;
			}
			}
			}

costcalc/bootstrap-4.3.1/scss/mixins/_box-shadow.scss19657233d360gh-pages