POSTCSS Find background CSS declarations that use /p/assets/images/1x1.png

postcss-ast.js

const uniqueValue =   [
  "/p/assets/images/1x1.png"
];

const plugin = () => ({
    postcssPlugin: 'postcss-reverse-props',
    Once(root) {
        // Transform CSS AST here
        root.walkRules(rule => {
            // Transform each rule here
            rule.walkDecls(decl => {
              if (decl.prop === 'background') {
                if (uniqueValue.some(value => decl.value.includes(value))) {
           
                  // Transform each property declaration here
                  decl.prop = `/* This is used */ ${decl.prop}`;
                }
              } 
            });
        });
    }
});

plugin.postcss = true;

export default plugin;