@atlaskit/eslint-plugin-design-system/dist/esm/rules/no-unused-css-map/unused-css-map-checker.js

The essential plugin for use with the Atlassian Design System.

import _slicedToArray from "@babel/runtime/helpers/slicedToArray";
import _classCallCheck from "@babel/runtime/helpers/classCallCheck";
import _createClass from "@babel/runtime/helpers/createClass";
function _createForOfIteratorHelper(r, e) { var t = "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (!t) { if (Array.isArray(r) || (t = _unsupportedIterableToArray(r)) || e && r && "number" == typeof r.length) { t && (r = t); var _n = 0, F = function F() {}; return { s: F, n: function n() { return _n >= r.length ? { done: !0 } : { done: !1, value: r[_n++] }; }, e: function e(r) { throw r; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var o, a = !0, u = !1; return { s: function s() { t = t.call(r); }, n: function n() { var r = t.next(); return a = r.done, r; }, e: function e(r) { u = !0, o = r; }, f: function f() { try { a || null == t.return || t.return(); } finally { if (u) throw o; } } }; }
function _unsupportedIterableToArray(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } }
function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; }
import { getSourceCode } from '@atlaskit/eslint-utils/context-compat';
import { findVariable } from '@atlaskit/eslint-utils/find-variable';
export var UnusedCssMapChecker = /*#__PURE__*/function () {
  function UnusedCssMapChecker(cssMapObject, context, cssMapCallNode) {
    _classCallCheck(this, UnusedCssMapChecker);
    this.cssMapObject = cssMapObject;
    this.cssMapCallNode = cssMapCallNode;
    this.report = context.report;
    this.context = context;
  }
  return _createClass(UnusedCssMapChecker, [{
    key: "checkForUnusedStyles",
    value: function checkForUnusedStyles() {
      // Get all defined style keys
      var definedStyles = new Map();
      var _iterator = _createForOfIteratorHelper(this.cssMapObject.properties),
        _step;
      try {
        for (_iterator.s(); !(_step = _iterator.n()).done;) {
          var _property = _step.value;
          if (_property.type === 'Property' && _property.key.type === 'Identifier') {
            definedStyles.set(_property.key.name, _property);
          }
        }
      } catch (err) {
        _iterator.e(err);
      } finally {
        _iterator.f();
      }
      if (definedStyles.size === 0) {
        return;
      }

      // Find the variable that holds the cssMap result
      var cssMapVariable = this.findCssMapVariable();
      if (!cssMapVariable) {
        return;
      }

      // Early return if no references - all styles are unused
      if (cssMapVariable.references.length === 0) {
        var _iterator2 = _createForOfIteratorHelper(definedStyles),
          _step2;
        try {
          for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
            var _step2$value = _slicedToArray(_step2.value, 2),
              styleName = _step2$value[0],
              property = _step2$value[1];
            this.report({
              node: property.key,
              messageId: 'unusedCssMapStyle',
              data: {
                styleName: styleName
              }
            });
          }
        } catch (err) {
          _iterator2.e(err);
        } finally {
          _iterator2.f();
        }
        return;
      }
      var usedStyles = new Set();
      var _iterator3 = _createForOfIteratorHelper(cssMapVariable.references),
        _step3;
      try {
        for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
          var ref = _step3.value;
          var node = ref.identifier;
          var parent = node.parent;
          if ((parent === null || parent === void 0 ? void 0 : parent.type) === 'MemberExpression') {
            if (!parent.computed && parent.property.type === 'Identifier') {
              // Static access: styles.danger (not computed)
              usedStyles.add(parent.property.name);

              // Early exit if all styles are found
              if (usedStyles.size === definedStyles.size) {
                return;
              }
            } else {
              // Dynamic access: styles[key], styles['danger'], etc. (computed)
              // Immediately exit - no styles will be reported as unused
              return;
            }
          }
        }

        // No dynamic access - report all unused styles
      } catch (err) {
        _iterator3.e(err);
      } finally {
        _iterator3.f();
      }
      var _iterator4 = _createForOfIteratorHelper(definedStyles),
        _step4;
      try {
        for (_iterator4.s(); !(_step4 = _iterator4.n()).done;) {
          var _step4$value = _slicedToArray(_step4.value, 2),
            _styleName = _step4$value[0],
            _property2 = _step4$value[1];
          if (!usedStyles.has(_styleName)) {
            this.report({
              node: _property2.key,
              messageId: 'unusedCssMapStyle',
              data: {
                styleName: _styleName
              }
            });
          }
        }
      } catch (err) {
        _iterator4.e(err);
      } finally {
        _iterator4.f();
      }
    }
  }, {
    key: "findCssMapVariable",
    value: function findCssMapVariable() {
      var callNode = this.cssMapCallNode;
      var parent = callNode.parent;
      if ((parent === null || parent === void 0 ? void 0 : parent.type) === 'VariableDeclarator' && parent.id.type === 'Identifier') {
        return findVariable({
          identifier: parent.id,
          sourceCode: getSourceCode(this.context)
        });
      }
      return null;
    }
  }, {
    key: "run",
    value: function run() {
      this.checkForUnusedStyles();
    }
  }]);
}();