diff --git a/lib/utils/isStandardSyntaxRule.js b/lib/utils/isStandardSyntaxRule.js
index 6ea9121f13..0fe6dc3f67 100644
--- a/lib/utils/isStandardSyntaxRule.js
+++ b/lib/utils/isStandardSyntaxRule.js
@@ -13,8 +13,6 @@ module.exports = function (rule) {
 		return false;
 	}
 
-	// Casting this to any because 'selector' does not exist on type 'NodeRaws'
-	/** @type {any} */
 	const raws = rule.raws;
 
 	// Get full selector
@@ -24,39 +22,11 @@ module.exports = function (rule) {
 		return false;
 	}
 
-	// Called Less mixin (e.g. a { .mixin() })
-	// @ts-ignore TODO TYPES support LESS and SASS types somehow
-	if (rule.mixin) {
-		return false;
-	}
-
-	// Less detached rulesets
-	if (selector.startsWith('@') && selector.endsWith(':')) {
-		return false;
-	}
-
-	// Ignore Less &:extend rule
-	if ('extend' in rule && rule.extend) {
-		return false;
-	}
-
-	// Ignore mixin or &:extend rule
-	// https://github.com/shellscape/postcss-less/blob/master/lib/less-parser.js#L52
-	// @ts-ignore TODO TYPES support LESS and SASS types somehow
-	if (rule.params && rule.params[0]) {
-		return false;
-	}
-
 	// Non-outputting Less mixin definition (e.g. .mixin() {})
 	if (selector.endsWith(')') && !selector.includes(':')) {
 		return false;
 	}
 
-	// Less guards
-	if (/when\s+(not\s+)*\(/.test(selector)) {
-		return false;
-	}
-
 	// Less Parametric mixins (e.g. .mixin(@variable: x) {})
 	if (/\(@.*\)$/.test(selector)) {
 		return false;