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Chapter 10 - Service Registry
unregisterService listener is asynchronous
Process Event: 'exit' listener must be synchronous

All examples are missing the appropriate code of the [ authsrv-plugin-logout ] package.

For the section above in chapter 8, the book states use "node server" to start the server.

The source code readme , however, states "you need to run the server using babel-cli: 'node_modules/.bin/babel-cli server.js'"

Neither of them work and both return the following error: "let markup = ReactDom.renderToString(<Router.RouterContext {...renderProps} />);

SyntaxError: Unexpected token < "

node_modules/authsrv-plugin-logout mentioned in chapter 07 example 05_plugin_module_impersonation does not exist

call spider function with nesting large than 1 would't work as expected

only two page had been download. and the callback never been call

i run cmd with your code:

$ node spider.js http://frps.eflora.cn/frps/Rosales

then a err comes--the file content i write to is undefined{1} .

function dowload(){
//...
 writeFile(filename, body))//{1}
//...
}

i think it may be good to change sth in :

• add another _agruments to save the aguments for function promisified({1})
• use the var at ({2},{3}) ,not agruments
  since here a function too, it may have its own arguments ({0})

-or change (not testing) args.push(function(err, result) { ...} to args.push((err, result)=>{...}

function promisify (callbackBasedApi) {
  return function promisified() {
    const args = [].slice.call(arguments);
    const _arguments = arguments; //{1}
    return new Promise((resolve, reject) => {  
      args.push(function(err, result) {     //{0}
        if(err) {
          return reject(err);       
        }
        if(_arguments.length <= 1) {       //{2}
          resolve(result);
        } else {
          resolve([].slice.call(_arguments, 1)); //{3}
        }
      });
      callbackBasedApi.apply(null, args);    
    });
  }
};

it may lead to the result of request operation in download function:

function dowload(){
//...
return request(url)
    .then(response => {
      body = response.body;
      //console.log(JSON.stringify(response));
     //the response is an array with length 2 . But it expect to an object since `request(url)`
    })
//...
}

thanky you !

The createProxy function (Chapter03/09_proxy_c) has a reference to this, in the patched version of the hello method, which happens to be an arrow function (with lexical this).

Please find a test attached to demonstrate the problem. Thank you.

test.js.txt

When I start the API and web server, both start without issue. However, when I navigate a browser to localhost:300, the terminal responds with "TypeError: loadPropsOnServer is not a function."

When I remove .default from require('async-props').default and run both the API and web server, then navigate the browser to that page, the page hangs and here is a response in the web server terminal:

Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components).

Any clues?

The promisify function (Chapter04/01_promisify.js) contains a reference to the arguments variable in the callback which happens to be an arrow function (with lexical arguments).

Please find attached a test which demonstrates the problem.

Thank you.

test.js.txt

The spiderLinks function is supposed to be asynchronous, but it seems that the callback will be executed synchronously in case utilities.getPageLinks(currentUrl, body) returns an empty array.