littleReact/src/PropTypes.js

//为了兼容yo
var check = function () {
    return check;
};
check.isRequired = check;
export var PropTypes = {
    array: check,
    bool: check,
    func: check,
    number: check,
    object: check,
    string: check,
    any: check,
    arrayOf: check,
    element: check,
    instanceOf: check,
    node: check,
    objectOf: check,
    oneOf: check,
    oneOfType: check,
    shape: check
};