swc_ecma_transforms_base 43.0.1

rust port of babel and closure compiler.
Documentation 
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function _object_spread(target) {
    for (var i = 1; i < arguments.length; i++) {
        var source = arguments[i] != null ? arguments[i] : {};
        var ownKeys = Object.keys(source);
        if (typeof Object.getOwnPropertySymbols === "function") {
            ownKeys = ownKeys.concat(
                Object.getOwnPropertySymbols(source).filter(function(sym) {
                    return Object.getOwnPropertyDescriptor(source, sym).enumerable;
                })
            );
        }
        ownKeys.forEach(function(key) {
            _define_property(target, key, source[key]);
        });
    }
    return target;
}