Learn Cypress, React-native and Realm

React Native lets you build mobile apps using only JavaScript. It uses the same design as React, letting you compose a rich mobile UI from declarative components.

react-native

Use Expo Orbit to install past builds from EAS as well as from your local machine.

You can also use Orbit to easily view and launch all your connected simulators, emulators and physical devices.

🔗 [Expo Orbit](https://docs.expo.dev/build/orbit/)

Use Expo Orbit to Install Past Builds

Reconfigure your eas.json and app.json so you can install the development, preview and production builds all on the same device.

An app on your phone is uniquely identified by the bundle identifier on iOS and the package on Android, so to make the builds unique we have to make these IDs different based on the build profile.

📖 [Docs](https://docs.expo.dev/build-reference/variants/)

Install Multiple Variants of Your iOS and Android Apps on the Same Device

Set up credentials to upload your Android build to Google Play automatically.

For automatic uploads, you'll need to set up all the app metadata on your Google Play account, including setting up app assets. You'll also need to configure and set up a Google Service Account.

📝 [Create a Google Service Account](https://github.com/expo/fyi/blob/main/creating-google-service-account.md) 
📝 [Store Assets](https://docs.expo.dev/guides/store-assets/)
📝 [EAS Submit Docs](https://docs.expo.dev/submit/introduction/)

Upload an Android App to the Google Play Store Automatically using Expo Publish

Set the build number to increment automatically and learn when to increment version numbers.

While you’re developing your app, when you submit an app with a specific version + version code to the App or Play Store, you cannot submit another app with the same values.

The best practice is to set the build number to increment automatically.

The version number can be incremented manually after each store release.

📖 [Docs](https://docs.expo.dev/build-reference/app-versions/)

Increment Version and Build Numbers for iOS and Android apps using EAS

Create the app on the Google Play Store, create the first production build on EAS, upload it to Google Play, and publish it to an internal testing group.

For sharing apps via Google Play, you will need a paid Google Play developer account. It is preferable to have an organisation account if you're looking to monetise your app (you'll need to verify your organisation before you can create apps). But if you you are building apps as an individual developer, you can use the individual developer account. 

When creating an individual developer account, you have some additional restrictions:
1. You must submit proof of ID and home address to create the account
2. If you want to monetise your apps, your home address will be shown on the Google Play developer page
3. You will need 20 testers to test your app for 14 days before you can apply for production access

🎮 [Google Play Console](https://play.google.com/console)

🔗  [Register for a Google Play Developer account](https://support.google.com/googleplay/android-developer/answer/6112435)

🔗 [Required information to create a Play Console developer account](https://support.google.com/googleplay/android-developer/answer/13628312?hl=en-GB)

🔗 [QR Code Generator](https://www.qr-code-generator.com/)


Create an Android Release Build with EAS and Upload to Google Play Store

Create an Internal Distribution (Preview) build for sharing your app in internally in production mode.

This can be used to share your build with your team or testers without submitting it to Google Play.

📝 [Docs](https://docs.expo.dev/build/internal-distribution/)

Create an Internal Distribution Build for Android with EAS

Create a Development Build that runs on Android Emulator or Device.

This build can be used for local development on Android. You can use the same apk (the build artifact) on both an Emulator (that you can install via Android Studio) or on a real android device.

🔗 [Expo Website](https://expo.dev/)

📝 [Docs](https://docs.expo.dev/build/introduction/)

🔗 [Android Studio](https://developer.android.com/studio)

Create a Development Build for Android with EAS

Submit your Production Build to the Apple App Store and install it via TestFlight.

When submitting a build to Apple with EAS Submit (or otherwise), it will first get added to TestFlight which is essentially a pre-prod environment for Apple. This will allow you to install and share the actual production build to testers before releasing it to users.

App names on the Apple App Store must be globally unique. So if you've chosen a name for your app that is already taken - like Plants - you will have to choose a different name for the App Store Listing page. Note that this is only the case for the app name on the App Store listing page, and you can still use your preferred name elsewhere.

**TestFlight Internal Testing** - as soon as you upload your build to App Store Connect and it finished processing, it is available for internal testing. You can add users to the internal testing group by email, and the users must be registered on your Apple Developer account.

**TestFlight External Testing** - this is a separate testing group that allows you to share the build with anyone either by sending them an email invite or using an invite URL. Before you can share the build, you must first submit a build for external testing and wait for it to be approved by Apple, which usually takes a couple of hours.

**Release** - in order for the build to actually show up on the Apple App Store, you will need to create a Release on App Store connect and submit it for review. This review usually takes about a day.

🔗 [TestFlight](https://developer.apple.com/testflight/)

📝 [EAS Submit Docs](https://docs.expo.dev/submit/introduction/)

📝 [App Store Assets Docs](https://docs.expo.dev/guides/store-assets/)

Submit an iOS App to the Apple App Store and TestFlight using EAS

Create an iOS Release build for distribution.

This build gets submitted to the Apple and can only be installed via TestFlight or the App Store.

Create an iOS Release Build for the Apple App Store with EAS

Create an Internal Distribution (Preview) build for sharing your app in internally in production mode.

This is the only way to share your iPhone app without submitting it to TestFlight and is often used for QA testing or internal demos.

📝 [Docs](https://docs.expo.dev/build/internal-distribution/)

Create an Internal Distribution Build for iPhone with EAS

Create a build to run on your physical iPhone device that can also be used for local development.

📝 [Enabling Developer Mode](https://docs.expo.dev/guides/ios-developer-mode/)

📖 Further reading: [Push Notifications Docs](https://docs.expo.dev/push-notifications/overview/)

Create a Development Build for iPhone With EAS

Set up a Distribution certificate and an Ad Hoc provisioning profile for iOS internal distribution builds.

Here we learn how to sign Apple app builds to make them installable on Apple devices.

In order to install your own app on any Apple device, you need an Apple Developer account and a subscription to the Apple Developer Program.

🔗 [Apple Developer Program](https://developer.apple.com/programs/)

⚙️ [Code Signing Illustration](https://www.linkedin.com/posts/kadi-kraman_an-illustration-of-what-code-signing-with-activity-7132420058076581888-s6TM)

Use the EAS CLI to Configure App Store Credentials for Internal Distribution Builds

Create an iOS build for developing locally on a Simulator.

This is the only native iOS build you can do on EAS without having an Apple Developer account and being enrolled in the Apple Developer Program.

It can be used for local development on an iOS simulator, so you can only do this on a Mac, because you must be able to install Xcode to get access to the iOS simulators.

⚙️ [Xcode](https://apps.apple.com/us/app/xcode/id497799835)

🔗 [Expo Website](https://expo.dev/)

📝 [Docs](https://docs.expo.dev/build/introduction/)

Create a Development Build for iOS Simulator with EAS

Set up an existing Expo Go project to use Development Builds.

Expo Go is a Sandbox Environment designed for learning prototyping and getting started with mobile development quickly. The major limitation of Expo Go is that you are completely unable to add or edit any native code in your app. This might be a trivial limitation at the start of your project when you're prototyping and experimenting, but most production quality apps will eventually need to have more control over their native app bundles.

This is where development builds come in. A development build is basically your own customised version of Expo Go: you build the native side of your app yourself and get to have all the control over what libraries and configurations are included.

Thanks to CNG (with prebuild) the native projects are generated automatically based off of your app config and package.json.

📝 [Expo Go](https://docs.expo.dev/get-started/expo-go/)

📝 [Development Builds](https://docs.expo.dev/develop/development-builds/introduction/)

📝 [Continuous Native Generation (CNG)](https://docs.expo.dev/workflow/continuous-native-generation/)

Set Up Your Expo Go Project to Use Development Builds

Create a new React Native project using the Expo CLI.

You can use any of the supported package managers: **npm**, **yarn**, **pnpm** or **bun**. In the video (and throughout the course) we use **yarn**.

You can also choose a template to use for your project. In this video we choose the blank TypeScript template, but you can choose a different template if you prefer.

📝 [Docs](https://docs.expo.dev/get-started/installation/)

Create a React Native App With Expo CLI

Expo Application Services ([EAS](https://expo.dev/eas)) is a cloud build service used to build and publish React Native apps.

This course will show you how to create the common types of builds for iOS and Android on EAS. We'll cover Development builds for local development, Preview builds for internal testing, and Production builds for release.

Additionally, you'll learn about:
- app versioning
- automatic store uploads
- setting up store listing pages
- installing multiple app variants on the same device
- installing past builds with [Expo Orbit](https://docs.expo.dev/build/orbit/)

## iOS

An overview of build signing, and why an Apple Developer account needed in order to install builds on a real device.

How to create:
- an iOS simulator build
- a build to use on your device for local development
- a build to share with your team without uploading it to App Store Connect
- a release build to use on the App Store

You will also learn how to upload your build to App Store Connect, share it on TestFlight and create a Release.

## Android

How to create:
- a build to use for development on an emulator or a device
- a build to share with your team without uploading it to Google Play
- a release build to use ob Google Play

We'll cover what is needed to create a new Google Play account, and the current restrictions for individual accounts.

You will also learn how to set up auto-submit on Google Play.

Build and Deploy React Native Apps with Expo EAS

Vue (pronounced /vjuː/, like view) is a progressive framework for building user interfaces. Unlike other monolithic frameworks, Vue is designed from the ground up to be incrementally adoptable. The core library is focused on the view layer only, and is very easy to pick up and integrate with other libraries or existing projects. On the other hand, Vue is also perfectly capable of powering sophisticated Single-Page Applications when used in combination with modern tooling and supporting libraries.

Some components render differently based on the route they are rendered on. To use router within component tests, it is best to define its default values in `cy.mount()` function. Since we can customize this in any way we’d like, we can create a custom `path` attribute where we can pass our own routes and test our component behavior against them.

Test a Component Rendering Within Different Router Locations in Cypress Component Test

Every component test that uses Pinia needs to have Pinia imported and initialized. Instead of doing this separately for each test you can customize your `cy.mount()` command to automatically use a default store. You can further then customize it to use your own store in case you want to change its state.

Rewrite Cypress mount() Command to Provide a Default Store to all Components

Instead of calling an action function to change the state, we can choose to change it directly by importing the attributes from our store. In order to not loose reactivity while destructuring properties we can use `storeToRefs()` function.

Mutate Application State Properties Directly with Pinia’s storeToRefs()

Fast, easy and reliable testing for anything that runs in a browser.

cypress

When component uses a state management tool like Pinia, it needs to be defined within the test. To use Pinia inside the Cypress component test, we need to create a Pinia instance and pass it into our store. For changing the state we can call our actions directly from within our test and assert different attributes of the component with Cypress commands

Call Pinia Store Actions From Within a Cypress Component Test

`emit()` function enables components to communicate with one another. While this communication is a good candidate for end to end test, we can also test this in isolation within component. To do this, we’ll use `cy.spy()` function that will watch for the defined function call. Using this, we can confirm that our emitted event was actually invoked.

Use Cypress cy.spy() Function to Test a Vue 3 Component’s Emitted Events

When we import assets in React components outside of the `public` folder that Nitro reads for assets by default when running the development server we need to tell Nitro how to find them with the `devProxy` configuration option.

```typescript
export default defineNitroConfig({
  renderer: './renderer.ts',
  devProxy: {
    '/app/assets': 'http://localhost:5173/app/assets'
  }
})
```

This is ultimately inadequate in scenarios where you want to import assets arbitrarily and have them "just work" but works in a pinch.



Use devProxy in Nitro Config to Serve Static Imported Assets in Dev Mode via Vite

Learn how to use devProxy in Nitro Config with Vite to serve static assets in React components in dev mode.

Start with a basic Vite React TypeScript app and enhance it for production use by integrating Nitro as the server. 

This requires a custom Vite plugin for nitro as well as a custom renderer and manually creating Nitro config.

The other way to approach this would be to add Vite to a Nitro app instead. Same basic result.

The [Nitro config reference](https://nitro.unjs.io/config) is a great read of you'd like to explore more options.


Configure a Vite React TypeScript Application on a Basic Nitro Server

Configure a Vite React TypeScript app by integrating Nitro for production, using custom plugins, renderers, and configs.

Quick Get Started style introduction to Vite using `pnpm create vite` with the React TypeScript template.

See [more in the official docs](https://vite.dev/guide/).

Create a Vite App with the React TypeScript Preset

Quick guide to start a Vite app using React TypeScript template with pnpm.

Over the years, your application have grown huge. Sometimes, really HUGE.

Many developers have contributed to the codebase. One day they pushed one coding style, a different one another day. Sometimes even different patterns and solutions for similar problems.

You want to keep your codebase consistent. In the Angular ecosystem, there were well established patterns for doing things the right way ™️. But the old solutions are being challenged by signal-based approach.

Eventually, you ask yourself the key question: **Should you integrate with the NEW solutions or stick to the battle-tested ones, but already considered LEGACY**?

That's a very good question indeed. Don't rush with architectural decisions 🤓.

## 👉 First, think of what problems you want to solve by introducing the change.

Do you have 1k LoC Angular components? Maybe even 2k? Do you and your team enjoy working with these? 😏

Where does the **domain logic and state management code** belong to - do you have a clear guidance on which code should be put where? Have you spot that different devs implement similar features in totally different ways?

Do you keep on asking the same questions over and over again: **whether this certain piece of code** should be **imperative** (plain old object properties and variables) or **reactive** (streams)? It'd be nice to keep all thinga reactive, but more often than not, it introduces complexity.

## 👉 Second, think of long-term consequences.

You are going to have more than one way to **manage the state**. But is that really an issue? If your codebase is modular, separate modules should not depend on each other in any way. Inner abstractions of one should be invisible to the other, etc.

You are going to introduce a **new tool**. On one hand, you need to learn it, and so does your team. But on the other hand, it's a breathe of fresh air. And it's useful to question the way you've been doing things so far. Maybe there's a more effective way?

You are going to embrace signal-based APIs. And that means taking taking advantage of Zoneless Angular. This means using all modern Angular APIs. And you know that signals are the future. Why would you want to stick to the **less performant, less type-safe, less flexible and, objectively, less effective solutions**?

## 👉 Finally, plan your INCREMENTAL integration.

INCREMENTAL is the absolute keyword here. You don't want to tell your PM you need to stop delivering features because of a refactor.

Actually, there's no need for a "refactor". Just pick the first new feature to be implemented. Or pick the one that needs to be extended.

NGRX Signal Store allows you to create both very simple & small stores, as well as bigger ones. **Composition** is the key here.

**Start simple**.

Create a `withState` section with the signals that hold the state. That's already reactive. And relatively simple.

```ts
const initialState: CartState = {
  items: ...,
  rebate: ...,
}

export const CartStore = signalStore(
  withState(initialState)
);
```

Create a `withMethods` section to provide ways to change the state:

```ts
export const CartStore = signalStore(
  ...
  withMethods((store) => ({
    addItem(item: ShoppingItem): void {
      patchState(store, (state) => ({ items: [ ...state.items, item ] }));
    },
    ...
);
```

Create a `withComputed` section to provide all derived computations:

```ts
export const CartStore = signalStore(
  ...
  withComputed(({ items }) => ({
    totalPrice: computed(() => items().reduce(...))
    ...
);
```

**Start simple**.

Now you can (literally) **`inject` this code into your existing solution**. All you need is to inject your brand new NGRX Signal Store implementation into a component, or a service:

```ts
@Injectable()
class ExistingBigService {
  cartStore = inject(CartStore)
  //...  
}
```

and that's it! What's beatiful is that NGRX Signal Store should remain an implementation details (of a component, service, etc). It **shouldn't leak outside to the entire application unintentionally**. Small NGRX Signal Stores help us to **keep logic more modular**.

Don't hesitate - give NGRX Signal Store a try! Start with the [_**Scalable Signals Angular Architecture with NGRX Signal Store**_](https://egghead.io/courses/scalable-signals-angular-architecture-with-ngrx-signal-store-a33abd39) course now!

Integrating NGRX Signal Store with an existing Angular application


Integrate NGRX Signal Store into your Angular app incrementally for modular, reactive state management. Improve consistency and performance with modern APIs.

In React 19, managing script tags efficiently within components can lead to performance enhancements and simpler code structures.

Originally, using script tags directly in a React component involved complex setups, like using `useEffect` to dynamically add JavaScript code. For instance, a component might dynamically inject script tags to load external widgets. This approach, while functional, resulted in multiple script tags and duplicate iframe elements. This duplication not only cluttered the output but also negatively impacted performance by loading scripts multiple times.

The workaround for this would be to manually hoist any common scripts and maybe load them when they weren't needed by any components.

With React 19 we now have a more effective method. This involves directly placing the script tag within the React component's return statement. This approach ensures that React handles the script loading, avoiding the duplication of script tags.

By implementing the script tags this way, the loading initiator becomes React DOM, which efficiently manages script loading and deduplication. This setup prevents multiple requests for the same script when the component is rendered multiple times, enhancing the overall application performance.

Furthermore, directly embedding the script tag simplifies the code, making the component cleaner and more maintainable.

Efficiently Render Script Tags in React 19 Components

Learn how to efficiently render script tags in React 19 components to improve performance by avoiding duplicate script loads and simplifying your code.

Let's learn how to dynamically manage title tags in React 19 applications. Rendering `<title>` dynamically is simple enough, however, a challenge arises when multiple title tags are present in the document, which can lead to issues with screen readers and search engine optimization (SEO). The solution presented involves ensuring that only one title tag is rendered at a time by using conditional rendering.

Also we need to make sure to have a single string within the title tag using a template literal, ensuring our HTML remains valid and optimized.


Deduplicate Title tags with React 19

Learn to manage multiple title tags in React 19 dynamically. Ensure accessibility and SEO by preventing duplicate title tags with clear examples.

In React 19, we can easily add a title tag like "Starship Deets" which then appears in the head section of the HTML even when we render it inside our components. This method also applies to meta tags such as character set and viewport settings, which are also lifted to the head section automatically.

This is an awesome feature because it maintains the same composition style we are familiar with in React components. It simplifies the handling of HTML head elements without needing extra setups like `useEffect` for accessing the head section. Even in situations where our components are rendering within a body element, like within a div, we can manage our head content directly within our components. React takes care of hoisting these elements where they need to go.


Hoist Title and Meta tags in React 19

Hoisting title and meta tags directly in React 19 components allows for simpler composition, similar to other React elements. Manage meta and title tags.

<PodcastLinks />

Dax Raad, known for his strong opinions on Twitter, sat down for a chat about web dev, career moves, and building cool stuff. He's not afraid to throw some heat at popular tools like [Next.js](https://nextjs.org/), though he still helps people use it. Dax is particularly excited about local-first development, which he thinks isn't getting enough attention. He argues that sometimes the best web dev move is to step away from web dev entirely and explore other areas of programming.

When it comes to career growth, Dax encourages developers to think beyond the "web dev" label and see themselves as programmers capable of tackling any challenge. He advocates for trying out weird stuff and learning unusual languages, as these experiences can lead to unexpected opportunities. Taking smart risks in your career can open doors to awesome possibilities.

In the business world, Dax is a fan of making "asymmetric bets" - moves with low downside but huge potential upside. He applies this philosophy to his work on [SST](https://sst.dev/), reasoning that even if it fails, he'll walk away with valuable experience. He also emphasizes the importance of resisting quick payouts in favor of potentially bigger wins down the road.

Looking to the future of tech, Dax is betting on local-first development. He sees potential in getting in early on emerging technologies like [Solid.js](https://www.solidjs.com/). Building in public and making connections in new tech communities can pay off in unexpected ways.

Dax also challenges the notion of constant hyper-productivity in tech. He suggests balancing focused work with time for exploration and learning. Sometimes, he points out, what seems like a "dumb" choice (like learning a niche language) can turn out to be a smart career move in the long run.

## Good Stuff Mentioned

- [Next.js](https://nextjs.org/)
- [Vercel](https://vercel.com/)
- [SST](https://sst.dev/)
- [Elixir](https://elixir-lang.org/)
- [Solid.js](https://www.solidjs.com/)
- [RepliCache](https://replicache.dev/)
- [Linear](https://linear.app/)
- [Remix](https://remix.run/)
- [Shopify](https://www.shopify.com/)
- [React](https://react.dev/)

Developer Career Growth and Asymmetric Bets with Dax Raad

<PodcastLinks />

Dev and Joel discuss React Miami conference, praising its fun atmosphere and location. They chat about React Server Components, with Dev sharing his experience building a mini framework. They talk about Vinxi, Nitro, and the unjs ecosystem as tools for creating custom frameworks. The conversation touches on Vue's popularity outside web dev circles and non-web dev conferences. They discuss the benefits of TypeScript and strongly-typed APIs. Dev mentions his upcoming talk on durable objects at [a conference in Dallas](https://x.com/DThompsonDev/status/1829674506237194456). They end by discussing WebSockets, PartyKit, and platform-specific frameworks.

## What's Good?

- [React Miami Conference](https://www.reactmiami.com/) 
- [Brenley Dueck's blog post on Simple RSC with Vinxi:](https://www.brenelz.com/posts/simple-rsc-with-vinxi/)
- [Vinxi](https://github.com/nksaraf/vinxi)
- [Nitro](https://nitro.unjs.io/guide/configuration)
- [unjs ecosystem](https://unjs.io/)
- [Solid Start](https://start.solidjs.com/)
- [TanStack Router](https://tanstack.com/router/latest) 
- [PartyKit](https://github.com/partykit/partykit) 
- [Durable Objects (Cloudflare)](https://developers.cloudflare.com/durable-objects/)
- [Flightcontrol](https://www.flightcontrol.dev/) 
- [SST](https://sst.dev/)
- [OpenNext](https://open-next.js.org/)

Nitro, Vinxi, and RSCs - What's Good with Dev Agrawal

**Note:** This course is being actively developed and more lessons will be added in the future.

Cursor is an AI-enhnaced code editor that allows you to call upon the robots to refactor or stub out functions for you with natural language. 

In this course, John will show you workflows that will save you time and effort by utilizing the features such as its mult-line editing and context.

In particular, by giving Cursor's AI the proper context, whether that's lines of code or multiple files, you'll get better output when trying to extend or refactor logic that's present.


Bite-size video tutorials for badass web developers.

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