length-zero-no-unit: allow mixin/function argument default values with unit (#221)

Author: kristerkari

__tests__/valid.scss

@@ -170,3 +170,19 @@ $ratios:
     4 3,
     3 2,
     16 9;
+
+@mixin hardcode-total-height($base-height, $extra-height: 0px) {
+  height: calc($base-height + $extra-height);
+}
+
+a {
+  @include hardcode-total-height(10px);
+}
+
+@function add-numbers($number-a, $number-b: 0px) {
+  @return calc($number-a + $number-b)
+}
+
+div {
+  width: add-numbers(10px);
+}

index.js

@@ -12,6 +12,13 @@ module.exports = {
 			},
 		],
 		'import-notation': 'string',
+		'length-zero-no-unit': [
+			true,
+			{
+				ignore: ['custom-properties'],
+				ignorePreludeOfAtRules: ['function', 'mixin'],
+			},
+		],
 		'scss/at-else-closing-brace-newline-after': 'always-last-in-chain',
 		'scss/at-else-closing-brace-space-after': 'always-intermediate',
 		'scss/at-else-empty-line-before': 'never',