toloframework/lib/babel-plugin-uglify.js

'use strict';

exports.__esModule = true;

function _classCallCheck(instance, Constructor) {
    if (!(instance instanceof Constructor)) {
        throw new TypeError('Cannot call a class as a function');
    }
}

function _inherits(subClass, superClass) {
    if (typeof superClass !== 'function' && superClass !== null) {
        throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass);
    }
    subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

var _uglifyJs = require('uglify-js');

var compressor = _uglifyJs.Compressor();

var LocationFixer = (function (_TreeWalker) {
    _inherits(LocationFixer, _TreeWalker);

    function LocationFixer(path) {
        _classCallCheck(this, LocationFixer);

        _TreeWalker.call(this, function (node) {
            node.start.file = node.end.file = path.hub.file.opts.filenameRelative;
        });
    }

    return LocationFixer;
})(_uglifyJs.TreeWalker);

exports['default'] = function (_ref) {
    var Plugin = _ref.Plugin;
    var t = _ref.types;
    return new Plugin('uglify', {
        visitor: {
            Program: function (ast) {
                // Convert to UglifyJS AST
                var uAST = _uglifyJs.AST_Node.from_mozilla_ast(ast);
                // Fix locations (Babel doesn't insert `loc.source` into nodes for some reason)
                uAST.walk(new LocationFixer(this));

                // Compress
                uAST.figure_out_scope();
                uAST = uAST.transform(compressor);

                // Mangle names
                uAST.figure_out_scope();
                uAST.compute_char_frequency();
                uAST.mangle_names();

                // Convert back to ESTree AST
                var result = uAST.to_mozilla_ast();
                return result;
            }
        }
    });
};

module.exports = exports['default'];