What’s New With Server-Side Rendering in React 16 – Hacker Noon

What’s New With Server-Side Rendering in #ReactJS 16:  by @xander76 #JavaScript #NodeJS

  • Naturally, this feature is also supported by React 16’s server-side rendering.So, you can now server-render components that look like this:class MyArrayComponent extends React.Component { render() { return [ div key=”1″first element/div, div key=”2″second element/div ]; }}class MyStringComponent extends React.Component { render() { return “hey there”; }}class MyNumberComponent extends React.Component {…
  • To learn more about this feature, read Dan Abramov’s post on the React blog about the change.React 16 SSR Doesn’t Support Error Boundaries or PortalsThere are two new features in the React 16 client-side renderer that are unfortunately not supported in the server-side renderer: Error Boundaries and Portals.
  • If for any reason there’s a mismatch, React raises a warning in development mode and replaces the entire tree of server-generated markup with HTML that has been generated on the client.In React 16, though, the client-side renderer uses a different algorithm to check that the server-generated markup is correct.
  • And when the client-side renderer in React 16 detects a markup mismatch, it only attempts to change the HTML subtree that doesn’t match, rather than the entire HTML tree.Generally, this change shouldn’t have much effect for end users, except for one fact: React 16 doesn’t fix mismatched SSR-generated HTML attributes…
  • This performance optimization means that you will need to make extra sure that you fix any markup mismatch warnings you see in your app in development mode.React 16 Doesn’t Need To Be Compiled For Best PerformanceIn React 15, if you used SSR straight out of the box, performance was less…

There are lots of exciting new bits (most notably the Fiber rewrite), but personally, I’m most excited about React 16’s many improvements that have been made to server-side rendering. Let’s take a…
Continue reading “What’s New With Server-Side Rendering in React 16 – Hacker Noon”

What’s new in React 16 – Netscape – Medium

What’s new in #ReactJS 16?

  • With React v16.0 Facebook has completely revised the internals of React while keeping the public API essentially the same.A brief introduction of the changes are:New Core Architecture:React 16 is the first version of React built on top of a new core architecture, which is named “Fiber”.
  • The new features in React v16.0 i.e. error boundaries, fragments, portals and async rendering (which is to be released soon) have been made possible due to Fiber.If you want to read more about this new architecture, here’s the link.Fragments Strings:With this new feature in React v16.0 now we can also…
  • To tackle this problem, a new concept has been introduced in React v16.0 namely Error Boundary.Only class components can be error boundaries.
  • Error Boundary ComponentNow you can use this Error Boundary as a regular component.If you’re interested in a screencast, I got you.Portals:With this new concept of portals React v16.0 allows us to renders children in any DOM node regardless of it’s location in the DOM.Click here to know more about portals.Server…
  • I don’t know much about server side rendering but I can refer you to this amazing article for an in-depth introduction to server side rendering in React v16.0.

React v16.0 comes with some major changes and an update to the react core algorithm. With React v16.0 Facebook has completely revised the internals of React while keeping the public API essentially…
Continue reading “What’s new in React 16 – Netscape – Medium”

What’s New With Server-Side Rendering in React 16 – Hacker Noon

What’s New With Server-Side Rendering in #ReactJS 16:  by @xander76 #JavaScript

  • Naturally, this feature is also supported by React 16’s server-side rendering.So, you can now server-render components that look like this:class MyArrayComponent extends React.Component { render() { return [ div key=”1″first element/div, div key=”2″second element/div ]; }}class MyStringComponent extends React.Component { render() { return “hey there”; }}class MyNumberComponent extends React.Component {…
  • To learn more about this feature, read Dan Abramov’s post on the React blog about the change.React 16 SSR Doesn’t Support Error Boundaries or PortalsThere are two new features in the React 16 client-side renderer that are unfortunately not supported in the server-side renderer: Error Boundaries and Portals.
  • If for any reason there’s a mismatch, React raises a warning in development mode and replaces the entire tree of server-generated markup with HTML that has been generated on the client.In React 16, though, the client-side renderer uses a different algorithm to check that the server-generated markup is correct.
  • And when the client-side renderer in React 16 detects a markup mismatch, it only attempts to change the HTML subtree that doesn’t match, rather than the entire HTML tree.Generally, this change shouldn’t have much effect for end users, except for one fact: React 16 doesn’t fix mismatched SSR-generated HTML attributes…
  • This performance optimization means that you will need to make extra sure that you fix any markup mismatch warnings you see in your app in development mode.React 16 Doesn’t Need To Be Compiled For Best PerformanceIn React 15, if you used SSR straight out of the box, performance was less…

There are lots of exciting new bits (most notably the Fiber rewrite), but personally, I’m most excited about React 16’s many improvements that have been made to server-side rendering. Let’s take a…
Continue reading “What’s New With Server-Side Rendering in React 16 – Hacker Noon”

What’s New With Server-Side Rendering in React 16 – Sasha Aickin – Medium

  • Naturally, this feature is also supported by React 16’s server-side rendering.So, you can now server-render components that look like this:class MyArrayComponent extends React.Component { render() { return [ div key=”1″first element/div, div key=”2″second element/div ]; }}class MyStringComponent extends React.Component { render() { return “hey there”; }}class MyNumberComponent extends React.Component {…
  • To learn more about this feature, read Dan Abramov’s post on the React blog about the change.React 16 SSR Doesn’t Support Error Boundaries or PortalsThere are two new features in the React 16 client-side renderer that are unfortunately not supported in the server-side renderer: Error Boundaries and Portals.
  • If for any reason there’s a mismatch, React raises a warning in development mode and replaces the entire tree of server-generated markup with HTML that has been generated on the client.In React 16, though, the client-side renderer uses a different algorithm to check that the server-generated markup is correct.
  • And when the client-side renderer in React 16 detects a markup mismatch, it only attempts to change the HTML subtree that doesn’t match, rather than the entire HTML tree.Generally, this change shouldn’t have much effect for end users, except for one fact: React 16 doesn’t fix mismatched SSR-generated HTML attributes…
  • This performance optimization means that you will need to make extra sure that you fix any markup mismatch warnings you see in your app in development mode.React 16 Doesn’t Need To Be Compiled For Best PerformanceIn React 15, if you used SSR straight out of the box, performance was less…

There are lots of exciting new bits (most notably the Fiber rewrite), but personally, I’m most excited about React 16’s many improvements that have been made to server-side rendering. Let’s take a…
Continue reading “What’s New With Server-Side Rendering in React 16 – Sasha Aickin – Medium”

Jest: Test suite with superpowers 😎

  • No need to write test cases for each component returned by render method.
  • The test case will look somthing like this:

    Whenever Jest sees this line , it is going to generate a snapshot and compare it with stored snapshot.

  • Snaps should be there in each dev’s machine so that if one of the devs changes some other component unknowingly, the snap test for that component will fail and he/she would know before pushing it.
  • You can also have a look at the example test case in our boilerplate code here.
  • We will write test case for the methods including snapshot test.

Jest: Test suite with superpowers 😎
Continue reading “Jest: Test suite with superpowers 😎”

Relay is just getting better : ) – Entria – Medium

Relay is just getting better : )  #react #graphql #graphcool #relaymodern #reactjs

  • In a recent commit to Relay 1.2, it was added a third argument to refetchConnection, the refetchConnection is an API provided by the createPaginationContainer.The trouble many where having was the need to paginate and refetch new data, for so it was necessary to compose a Refetch container with a Paginate container as a child, as you can imagine this was not easy to get done and didn’t work well.Using the Refetch container to do it all is also an option, but this also means that you will have to use graphql.experimental and as the name indicates this is something that is still experimental and might change.How can we set up a pagination container with also some refetch, well here is the fun part.First let’s create this Pagination container in a component which renders a list of links.Now in the Pagination Container there are 3 variables, count, after and filter.
  • Count and After are part of the pagination logic, we are interested in refetching the filter variable.Before we proceed on to how to refetch, first we need to set these variables in the parent Query Renderer.
  • For that let’s declare it on the Query Renderer.We have to declare the variables in two places, inside the query as its arguments and also inside the component QueryRenderer as a prop.
  • Now we have access to these variables in our child queries.Since the Pagination Container exposes loadMore API to this.props.relay, all you have to do to paginate or load more is call this API with the page number as you can see below.But this we all know.What about refetching ?
  • for refetching is equally simple.the refetchConnection API takes three totalCount: number, callback: (error: ?

In a recent commit to Relay 1.2, it was added a third argument to refetchConnection, the refetchConnection is an API provided by the createPaginationContainer. The trouble many where having was the…
Continue reading “Relay is just getting better : ) – Entria – Medium”

pixielabs/cavy – An integration test framework for #reactjs native

  • Cavy is a cross-platform integration test framework for React Native, by Pixie Labs.
  • Cavy (ab)uses React generating functions to give you the ability to refer to, and simulate actions upon, deeply nested components within your application.
  • This function should be used if your testable component does not respond to either or , for example:

    Cavy is a comparable tool to Appium.

  • The key difference is that Appium uses native hooks to access components (accessibility IDs), wheras Cavy uses React Native refs.
  • Jest is a useful tool for unit testing individual React Native components, whereas Cavy is an integration testing tool allowing you to run end-to-end user interface tests.

cavy – An integration test framework for React Native.
Continue reading “pixielabs/cavy – An integration test framework for #reactjs native”