Server-side rendering support? about js-client-sdk

[apucacao]

Hi @mickeyreiss-visor ,

We recommend combining the Node.js SDK with the client-side SDK for server-side rendering.

From a high-level — assuming you use express.js or something similar — it looks like this:

1. initialize the Node SDK as part of your server app
2. when a request comes in, grab the flag settings for the current user and pass those values to the server-side rendering code
3. bootstrap the client-side SDK with the flag values for the current user

Bootstrapping the client-side SDK this way has two benefits:

• you can render the UI on the server with the correct flag values for the current user
• it causes SDK initialization to be practically instantaneous

Hope that helps. Let me know if you have any other questions 😃

[Askadias]

Hi @apucacao, having the following error on server client initialization in case of React Server-Side Rendering:
TypeError: Cannot read property 'removeIf' of undefined

Probably because of a custom function being added to Array prototype. But still seems like for in is not the best option here while modifying Array.prototype is no the best option to define a function.

Array.prototype.removeIf = function (callback) {
  let i = this.length;
  while (i--) {
    if (callback(this[i])) {
      this.splice(i, 1);
    }
  }
};

[eli-darkly]

@Askadias Thank you for reporting this, but in the future could you please file a new issue rather than commenting on a closed one that's more than two years old? Also, I think you've filed it in the wrong repository— the code you've screenshotted is not part of js-client-sdk; it appears to be part of the server-side Node SDK, specifically its logic for evaluating feature flag rules, which is not something js-client-sdk does at all.