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SassMeister-input.scss

// ----
// Sass (v3.4.25)
// Compass (v1.0.3)
// ----

@mixin font-size($font-size, $line-height: null) {
	font-size: $font-size;

	@if $line-height != null {
		@if unit($font-size) == unit($line-height) {
			line-height: ($line-height / $font-size);
		} @else {
			line-height: $line-height;
		}
	}
}

.foo {
	@include font-size(16px);
}

.bar {
	@include font-size(16px, 20px);
}

.bar {
	@include font-size(50%, 80%);
}

.quu {
	@include font-size(2em, 30px);
}

.que {
	@include font-size(18px, 1.5);
}

SassMeister-output.css

.foo {
  font-size: 16px;
}

.bar {
  font-size: 16px;
  line-height: 1.25;
}

.bar {
  font-size: 50%;
  line-height: 1.6;
}

.quu {
  font-size: 2em;
  line-height: 30px;
}

.que {
  font-size: 18px;
  line-height: 1.5;
}