Use this to declare that children should only be visible while the viewport width is less than the start offset of the specified breakpoint.

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It's impossible to reliably know the user's current breakpoint during the server render phase since that requires a browser.

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Use this to declare that children should only be visible while the viewport width is equal or greater than the start offset of the next breakpoint.

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Use this to declare that children should only be visible while the viewport width is equal to the start offset of the specified breakpoint or greater.

If you don't want to release on a particular PR but the changes aren't trivial then use the Skip Release tag along side the appropriate version tag.

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In the React ecosystem a common approach to writing declarative responsive components is to use the browser’s matchMedia api:

When all JS has loaded and React starts the rehydration phase, we query the browser for what breakpoint it’s currently at and then limit the rendered components to the matching media queries. This prevents life-cycle methods from firing in hidden components and unused html being re-written to the DOM.

And that's it! To test, disable JS and scale your browser window down to a mobile size and reload; it will correctly render the mobile layout without the need to use a user-agent or other server-side "hints".

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Additionally, we register event listeners with the browser to notify the MediaContextProvider when a different breakpoint is matched and then re-render the tree using the new value for the onlyMatch prop.

Why not just render the one that the current device needs? We can't accurately identify which breakpoint your device needs on the server. We could use a library to sniff the browser user-agent, but those aren't always accurate, and they wouldn't give us all the information we need to know when we are server-rendering. Once client-side JS boots and React attaches, it simply washes over the DOM and removes markup that is unneeded, via a matchMedia call.

The browser receives markup with proper media query styling and will immediately start rendering the expected visual result for whatever viewport width the browser is at.

By default, when rendered client-side, the browser’s matchMedia api will be used to further constrain the onlyMatch list to only the currently matching media queries. This is done to avoid triggering mount related life-cycle hooks of hidden components.

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The Media component created for your application has a few mutually exclusive props that make up the API you’ll use to declare your responsive layouts. These props all operate based on the named breakpoints that were provided when you created the media components.

@artsy/fresnel works great with Gatsby or Next.js's static hybrid approach to rendering. See the examples below for a simple implementation.

Other existing solutions take a conditionally rendered approach, such as react-responsive or react-media, so where does this approach differ?

Use this to declare that children should only be visible at a specific breakpoint, meaning that the viewport width is greater than or equal to the start offset of the breakpoint, but less than the next breakpoint, if one exists.

First things first. You’ll need to define the breakpoints and interaction needed for your design to produce the set of media components you can use throughout your application.

For example, children of this Media declaration will only be visible if the viewport width is equal or greater than 1024 points:

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For example, children of this Media declaration will only be visible if the viewport width is between 0 and 1024 (1024 not included) points:

Rendering can be constrained to specific breakpoints/interactions by specifying a list of media queries to match. By default all will be rendered.

Setting breakpoint sizes based on user-agent sniffing is prone to errors due the inability to precisely match device capabilities to size. One mobile device might have greater pixel density than another, a mobile device may fit multiple breakpoints when taking device orientation into consideration, and on desktop clients there is no way to know at all. The best devs can do is guess the current breakpoint and populate with assumed state.

When writing responsive components it's common to use media queries to adjust the display when certain conditions are met. Historically this has taken place directly in CSS/HTML:

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Major, minor, and patch will cause a new release to be generated. Use major for breaking changes, minor for new non-breaking features, and patch for bug fixes. Trivial will not cause a release and should be used when updating documentation or non-project code.

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Use this to declare that children should only be visible while the viewport width is equal to the start offset of the first specified breakpoint but less than the start offset of the second specified breakpoint.

For example, children of this Media declaration will only be visible if the viewport width is between 768 and 1192 (1192 not included) points:

That last point presents an interesting problem. How might we represent a component that gets styled differently at different breakpoints? (Let’s imagine a matchMedia example.)

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While the Basic and SSR examples will get one pretty far, @artsy/fresnel can do a lot more. For an exhaustive deep-dive into its features, check out the Kitchen Sink app.

By hooking into a breakpoint definition, @artsy/fresnel takes this declarative approach and brings it into the React world.

Besides the Media and MediaContextProvider components, there's a createMediaStyle function that produces the CSS styling for all possible media queries that the Media instance can make use of while markup is being passed from the server to the client during hydration. If only a subset of breakpoint keys is used those can be optional specified as a parameter to minimize the output. Be sure to insert this within a