analyze-css/rules/prefixes.js

CSS selectors complexity and performance analyzer

"use strict";

var debug = require("debug")("analyze-css:prefixes"),
  format = require("util").format;

/**
 * @param { import("../lib/css-analyzer") } analyzer
 */
function rule(analyzer) {
  var data = require(__dirname + "/prefixes.json"),
    prefixes = data.prefixes;

  debug("Using data generated on %s", data.generated);
  analyzer.setMetric("oldPropertyPrefixes");

  analyzer.on("declaration", function (rule, property, value) {
    var prefixData = prefixes[property];

    // prefix needs to be kept
    if (prefixData && !prefixData.keep) {
      analyzer.incrMetric("oldPropertyPrefixes");
      analyzer.addOffender(
        "oldPropertyPrefixes",
        format(
          "%s { %s: %s } // %s",
          rule.selectors.join(", "),
          property,
          value,
          prefixData.msg,
        ),
      );
    }
  });
}

rule.description = "Reports outdated vendor prefixes";
module.exports = rule;