d2-ui/node_modules-v25.0.x/babel-plugin-transform-es2015-typeof-symbol/lib/index.js

d2-ui

/*istanbul ignore next*/"use strict";

exports.__esModule = true;

var _symbol = require("babel-runtime/core-js/symbol");

var _symbol2 = _interopRequireDefault(_symbol);

exports.default = function ( /*istanbul ignore next*/_ref) {
  /*istanbul ignore next*/var t = _ref.types;

  var IGNORE = /*istanbul ignore next*/(0, _symbol2.default)();

  return {
    visitor: { /*istanbul ignore next*/
      Scope: function Scope(_ref2) {
        /*istanbul ignore next*/var scope = _ref2.scope;

        if (!scope.getBinding("Symbol")) {
          return;
        }

        scope.rename("Symbol");
      },
      /*istanbul ignore next*/UnaryExpression: function UnaryExpression(path) {
        /*istanbul ignore next*/var node = path.node;
        /*istanbul ignore next*/var parent = path.parent;

        if (node[IGNORE]) return;
        if (path.find(function (path) /*istanbul ignore next*/{
          return path.node && !!path.node._generated;
        })) return;

        if (path.parentPath.isBinaryExpression() && t.EQUALITY_BINARY_OPERATORS.indexOf(parent.operator) >= 0) {
          // optimise `typeof foo === "string"` since we can determine that they'll never need to handle symbols
          var opposite = path.getOpposite();
          if (opposite.isLiteral() && opposite.node.value !== "symbol" && opposite.node.value !== "object") {
            return;
          }
        }

        if (node.operator === "typeof") {
          var call = t.callExpression(this.addHelper("typeof"), [node.argument]);
          if (path.get("argument").isIdentifier()) {
            var undefLiteral = t.stringLiteral("undefined");
            var unary = t.unaryExpression("typeof", node.argument);
            unary[IGNORE] = true;
            path.replaceWith(t.conditionalExpression(t.binaryExpression("===", unary, undefLiteral), undefLiteral, call));
          } else {
            path.replaceWith(call);
          }
        }
      }
    }
  };
};

/*istanbul ignore next*/
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

module.exports = exports["default"]; /* eslint max-len: 0 */