Refactor declaration-property-value-no-unknown to reuse parsed CSST…

…ree node (#6616)

According to the [CSSTree doc](https://github.com/csstree/csstree/blob/v2.3.1/README.md#usage),
it is likely a typical case to pass a node to `lexer.matchProperty()`.

lib/rules/declaration-property-value-no-unknown/index.js

@@ -84,10 +84,12 @@ const rule = (primary, secondaryOptions) => {
 
 			if (isPropIgnored(prop, value)) return;
 
+			let cssTreeValueNode;
+
 			try {
-				const valueNode = parse(value, { context: 'value' });
+				cssTreeValueNode = parse(value, { context: 'value' });
 
-				if (containsUnsupportedMathFunction(valueNode)) return;
+				if (containsUnsupportedMathFunction(cssTreeValueNode)) return;
 			} catch (e) {
 				result.warn(`Cannot parse property value "${value}"`, {
 					node: decl,
@@ -97,7 +99,7 @@ const rule = (primary, secondaryOptions) => {
 				return;
 			}
 
-			const { error } = forkedLexer.matchProperty(prop, value);
+			const { error } = forkedLexer.matchProperty(prop, cssTreeValueNode);
 
 			if (!error) return;
 

patches/@types+css-tree+2.0.1.patch

@@ -17,7 +17,7 @@ index 2e4ed18..7f096c6 100755
 +};
 +
 +declare class Lexer {
-+    matchProperty(propertyName: string, value: string): MatchResult;
++    matchProperty(propertyName: string, value: CssNode | string): MatchResult;
 +}
 +
 +export function fork(extension: Record<string, Record<string, string>>): { lexer: Lexer };