babel-plugin-global-define/lib/index.js

The GlobalDefine plugin allows you to create global constants which is similar to Webpack's DefinePlugin.

"use strict";

Object.defineProperty(exports, "__esModule", {
    value: true
});

exports.default = function (_ref) {
    var t = _ref.types;

    return {
        visitor: {
            MemberExpression: function MemberExpression(path, _ref2) {
                var params = _ref2.opts;

                Object.keys(params).forEach(function (key) {
                    if (memberExpressionMatcher(path, key)) {
                        replacer(path, params[key], t.valueToNode);
                    }
                });
            },
            Identifier: function Identifier(path, _ref3) {
                var params = _ref3.opts;

                Object.keys(params).forEach(function (key) {
                    if (identifierMatcher(path, key)) {
                        replacer(path, params[key], t.valueToNode);
                    }
                });
            }
        }
    };
};

var memberExpressionMatcher = function memberExpressionMatcher(path, key) {
    return path.matchesPattern(key);
};
var identifierMatcher = function identifierMatcher(path, key) {
    return path.node.name === key;
};

var replacer = function replacer(path, value, valueToNode) {
    path.replaceWith(valueToNode(value));

    if (path.parentPath.isBinaryExpression()) {
        var result = path.parentPath.evaluate();
        if (result.confident) {
            path.parentPath.replaceWith(valueToNode(result.value));
        }
    }
};