swc_ecma_transforms_base 41.0.1

rust port of babel and closure compiler.
Documentation 
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var REACT_ELEMENT_TYPE;
function _jsx(type, props, key, children) {
    if (!REACT_ELEMENT_TYPE) {
        REACT_ELEMENT_TYPE = typeof Symbol === "function" && Symbol.for && Symbol.for("react.element") || 0xeac7;
    }
    var defaultProps = type && type.defaultProps;
    var childrenLength = arguments.length - 3;
    if (!props && childrenLength !== 0) {
        props = { children: void 0 };
    }
    if (props && defaultProps) {
        for (var propName in defaultProps) {
            if (props[propName] === void 0) {
                props[propName] = defaultProps[propName];
            }
        }
    } else if (!props) {
        props = defaultProps || {};
    }
    if (childrenLength === 1) {
        props.children = children;
    } else if (childrenLength > 1) {
        var childArray = new Array(childrenLength);
        for (var i = 0; i < childrenLength; i++) {
            childArray[i] = arguments[i + 3];
        }
        props.children = childArray;
    }
    return { $$typeof: REACT_ELEMENT_TYPE, type: type, key: key === undefined ? null : "" + key, ref: null, props: props, _owner: null };
}