Merge branch 'main' into next

# Conflicts:
#	.eslintrc.cjs
#	package.json
#	src/language-yaml/index.js
#	yarn.lock

src/language-css/printer-postcss.js

@@ -419,7 +419,7 @@ function genericPrint(path, options, print) {
           ? [node.namespace === true ? "" : node.namespace.trim(), "|"]
           : "",
         node.attribute.trim(),
-        node.operator ? node.operator : "",
+        node.operator ?? "",
         node.value
           ? quoteAttributeValue(
               adjustStrings(node.value.trim(), options),