Warn when using incorrect dashed-ident/ident

Author: jgerigmeyer

src/parse.js

@@ -103,6 +103,13 @@ export default function parse (str, {meta} = {}) {
 							Object.assign(meta, {formatId: "color", types});
 						}
 
+						if (colorSpec.id.startsWith("--") && !id.startsWith("--")) {
+							console.warn(`color(${id}) used instead of prefixed color(${colorSpec.id}).`);
+						}
+						if (id.startsWith("--") && !colorSpec.id.startsWith("--")) {
+							console.warn(`color(${id}) used instead of unprefixed color(${colorSpec.id}).`);
+						}
+
 						return {spaceId: space.id, coords, alpha};
 					}
 				}