Learn Chrome-devtools, Leaflet and Nginx

WAI-ARIA, the Accessible Rich Internet Applications Suite, defines a way to make Web content and Web applications more accessible to people with disabilities. It especially helps with dynamic content and advanced user interface controls developed with Ajax, HTML, JavaScript, and related technologies. 

aria

Debug Computed Accessibility Properties with Chrome Dev Tools

In this lesson, we use the element inspector in Chrome to test and improve our contrast to meet WCAG AA Contrast Ratio Standards.

Resources:
- [WebAIM - Contrast and Color Accessibility](https://webaim.org/articles/contrast/)

Debugging Accessible Contrast with Chrome Dev Tools

In this course, Colby is going to do a deep dive into creating a full store for your products. You'll learn how to set up and use GraphCMS as your content management system. You'll learn about the Cloudinary UI extension and how to use it to host your images. You'll learn about Snipcart and using the useSnipcart hook to handle the cart state and the checkout. You'll learn how to implement Stripe as your payment gateway. And lastly, you'll learn how to deploy a Next js app to vercel from github with environment variables.

snipcart

Ecommerce Product Management & Storefront with GraphCMS, Snipcart, & Next.js

graphcms

Displaying a list of physical locations is helpful, but showing them on a map, giving your potential customers the ability to see how close each store really is to their location is even better.

GraphCMS supports adding coordinates as a field to our data models, where we can dynamically pull those coordinates in and add them to a map.

We'll walk through how we can loop through our store locations and add each one to a new React Leaflet map. We'll also learn about some pitfalls of using React Leaflet in an app framework like Next.js and how we can solve it with dynamic imports and manual image imports.

* [Dynamic Import - nextjs.org](https://nextjs.org/docs/advanced-features/dynamic-import)
* [Leaflet Map Marker Rendering - github.com](https://github.com/Leaflet/Leaflet/issues/4968)

I also have a whole course on how to [Build Maps using React Leaflet](https://egghead.io/courses/build-maps-with-react-leaflet) if you want a further dive on the topic. 

Add All Store Locations to a React Leaflet Map with Location Data From GraphCMS

Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.

node

Ghost has two hard dependencies which need to be installed before it can run. Those are Nginx and Node.js.

We will start by installing Nginx and set Nginx up to control the traffic coming into the EC2 server. After this, we'll install NVM using the raw install script that they provide on GitHub. With NVM installed we can then install the latest version of Node.js


Install Nginx and Node.js on a AWS EC2 Server

The Chrome Developer Tools (DevTools for short), are a set of web authoring and debugging tools built into Google Chrome.

chrome-devtools

Lighthouse is a tool that analyses web apps and web pages, collecting modern performance metrics and insights on developer best practices.

It's built directly into the Chrome DevTools and in this quick lesson we're going to learn how to run the audit, how to read its results and why you should always run the Lighthouse audit in Incognito mode.



Run a Lighthouse audit in Chrome Devtools

Sometimes you encounter a backend issue which seems to occur only on your computer, with a very specific sets of headers, cookies etc. Because of that, it's useful to have a way of easily sharing network requests sent by your browser with other members of your team.

In this quick lesson we're going to learn how to copy a network request as `fetch` (so we can test it in the Chrome DevTools console/in a node.js script) or as cURL (so we can test it in a terminal).

Copy a network request as fetch or cURL with Chrome DevTools

Sometimes when debugging our CSS styles it's useful to be able to see what a DOM element is going to look like in a given state (e.g. `:focus`, `:active, `:hover`) etc.

Unfortunately it's not possible to both hover over an element and debug it in Chrome DevTools at the same time (since we only have a single cursor!).

In this quick lesson we're going to learn how to address this problem by explicitly forcing an element state to `:hover` with DevTools

Force a DOM element state in Chrome DevTools

React is one of the web’s most popular frameworks for building JavaScript applications. 

If you know what you’re doing, React can drastically simplify how you build, use, and maintain code.

Whether you’re a React newbie or you’re ready for advanced techniques, you can level-up with egghead. Explore our in-depth courses, lessons, and community resources to build more powerful applications and crack open your career.

react

So far, we haven't noticed any issues with map state, but that doesn't mean there aren't any issues!

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/05%20-%20Managing%20Leaflet%20State%20in%20a%20React%20App%20with%20Hooks#4-adding-markers-in-a-single-source-to-avoid-mismanaged-state)**

Manage Stale Map Data in React Leaflet 

Now that we have finished up with our map app, let's do a little cleaning up! Here we are going to go through our Location Event Handler and clean it up for when the page unmounts.  

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/10%20-%20Use%20Leaflet's%20Geolocation%20API%20to%20Find%20Locations%20Near%20you#1-clean-up-location-event-handler-resources-when-page-unmounts)**

Clean up Location Event handler Resources when Page Unmounts in React useEffect

Now that we can pinpoint our location, we noticed that it's not exactly the most accurate indication of where we're at. To help, Leaflet provides an accuracy indicator in meters that we can use to show on the map the margin of error for that location.

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/10%20-%20Use%20Leaflet's%20Geolocation%20API%20to%20Find%20Locations%20Near%20you#4-add-a-circle-to-the-map-designating-the-accuracy-of-the-browsers-location)**

Add a React Leaflet Circle to the Map Designing the Accuracy of the Browser's Location

Most of us are able to identify where we're located on the map, but it can be hard to visualize that in context to other locations. To help, we can add a marker to the map to show our location.

To get started, we'll add a marker to a specific location to see how it relates to the restaurants that are on our map.

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/10%20-%20Use%20Leaflet's%20Geolocation%20API%20to%20Find%20Locations%20Near%20you#1-add-a-marker-to-a-location-when-clicking-a-button)**

Add a React Leaflet Marker to a Location when Clicking a Button

Rather than setting a location manually, web browsers provide a way that we can request access to someone's location. This lets us personalize features and particularly in our use case, find where the person is on the map to see what's close to them.

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/10%20-%20Use%20Leaflet's%20Geolocation%20API%20to%20Find%20Locations%20Near%20you#2-create-a-button-that-finds-your-location-and-navigates-the-map-to-that-location)**

Add a Button that Finds your Location and Navigates the Map to the Location with Leaflet

While we were able to find our location, Leaflet's geolocation features don't set a marker by default. What they do provide is event handlers that allow us to know when the location is found.

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/10%20-%20Use%20Leaflet's%20Geolocation%20API%20to%20Find%20Locations%20Near%20you#3-use-the-browsers-location-to-add-a-marker-to-the-map)**

Use the Browser's Location to Add a React Leaflet Marker to the Map

As we just noticed, we don't get the shadows to our markers by default. While we can add a custom one, we can use the default shadows which will work just as well with our custom markers.

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/09%20-%20Customize%20Restaurant%20Location%20Markers%20with%20Custom%20Images#3-add-the-default-shadows-back-to-our-markers)**

Import and Add the Default React Leaflet Shadows back to our Markers

Not only can we use the Leaflet Icon instance to add a custom image, we can create completely custom HTML! This opens the door to a lot of possibilities that you can't do with only an image like using CSS to add effects.

For this extra credit, use a different Leaflet icon type called DivIcon to transform our markers into custom HTML, which you can then style with CSS.

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/09%20-%20Customize%20Restaurant%20Location%20Markers%20with%20Custom%20Images#1-replace-the-marker-with-custom-html-and-style-with-css)**

Replace the Marker with Custom HTML and Style with CSS

In lesson 10, we are going to be focusing on how to add a marker to the map on button click to designate a location, create a button that finds and navigates to your location, add a marker to the map showing your location and add a radius to the map showing the accuracy of your location

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/10%20-%20Use%20Leaflet's%20Geolocation%20API%20to%20Find%20Locations%20Near%20you#-lesson-10-use-leaflets-geolocation-api-to-find-locations-near-you)**

Section 10 - Use Leaflet's Geolocation API to Find Locations Near You

Before we create a completely custom icon, we need to set up our GeoJSON configuration to allow us to manually create markers in the first place. We'll start by recreating our current markers.

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/09%20-%20Customize%20Restaurant%20Location%20Markers%20with%20Custom%20Images#1-recreate-restaurant-markers-with-geojson-configuration-option)**

Recreate React Leaflet Markers with the GeoJSON pointToLayer Configuration Set 

Now's the fun part! With our configuration, we can now substitute the default markers with our own custom ones.

For this lesson, I've provided you with a custom image that you can use:

`src/assets/images/utensils-marker.png`

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/09%20-%20Customize%20Restaurant%20Location%20Markers%20with%20Custom%20Images#2-replace-the-default-location-markers-with-a-custom-image)**

Replace the Default React Leaflet Location Markers with a Custom Image

Just like we changed the styles of our markers before, we can change the colors of shapes.

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/08%20-%20Add%20Restaurant%20Delivery%20Zones%20to%20Map%20with%20Shaded%20Regions#1-change-the-color-of-the-delivery-zone)**

Change the Color of the React Leaflet Delivery Zone

In a lot of cases, not every marker is the same. Sometimes we have a restaurant, but other times we might have a museum, so we should be able to visually represent that type of location to make our map easier to use.

We'll learn how to create custom markers by using a new configuration option with our Leaflet GeoJSON instance.

**[Click here for exercise instructions](https://github.com/colbyfayock/launchtime-workshop/tree/master/lessons/09%20-%20Customize%20Restaurant%20Location%20Markers%20with%20Custom%20Images)**

Section 09 - Customize Restaurant Location Markers with Custom Images

I've been using Cursor for a very long time and their "Agent" feature in Composer is fairly new, so I'm still getting used to it. But since Windsurf recently got onto the stage with their Cascade agent, they've slowly been gaining the mind share on the UX for coding agents. I decided to put them to the test by putting Windsurf and Cursor on the exact same screen side by side trying to accomplish the same task and to see which workflow I would prefer. I've been a diehard Cursor user for over a year now, so it's going to take a lot for me to switch to a different IDE. But I just have to say, even from this simple demo, Windsurf is looking pretty nice.

This lesson is just going to walk through creating a CLI using both tools to print out inspirational quotes and to explore how they approach the step-by-step of installing packages and running commands and setting up all the files we need to get this running.

Windsurf Cascade vs. Cursor Composer Agent Side-by-Side Comparison

This TypeScript tutorial explains how to use generics, allowing for different types to be passed as arguments. It discusses the use of shorthand syntax in generics and illustrates with examples. This method is useful for library creation, providing type safety and control to the user.

```typescript
interface PhotoMetadata<T> {
  title: string;
  takenAt: Date;
  customData: T;
}

// Function that processes a photo with custom metadata
function processPhoto<T>(photo: PhotoMetadata<T>): {
  processedTitle: string;
  daysSinceCapture: number;
  customDataSummary: T;
} {
  const today = new Date();
  const daysSinceCapture = Math.floor(
    (today.getTime() - photo.takenAt.getTime()) / (1000 * 60 * 60 * 24)
  );

  return {
    processedTitle: photo.title.toUpperCase(),
    daysSinceCapture,
    customDataSummary: photo.customData
  };
}

// Example usage with different custom data shapes
type CameraSettings = {
  iso: number;
  aperture: string;
  shutterSpeed: string;
}

type LocationData = {
  latitude: number;
  longitude: number;
  locationName: string;
}

// Using with camera settings
const photoWithCamera: PhotoMetadata<CameraSettings> = {
  title: "Sunset at beach",
  takenAt: new Date('2024-01-15'),
  customData: {
    iso: 100,
    aperture: "f/2.8",
    shutterSpeed: "1/1000"
  }
};

// Using with location data
const photoWithLocation: PhotoMetadata<LocationData> = {
  title: "Mountain vista",
  takenAt: new Date('2024-02-01'),
  customData: {
    latitude: 45.5231,
    longitude: -122.6765,
    locationName: "Mount Hood"
  }
};

const processedCameraPhoto = processPhoto(photoWithCamera);
const processedLocationPhoto = processPhoto(photoWithLocation);

processedCameraPhoto.customDataSummary.iso
processedLocationPhoto.customDataSummary.longitude

```

Basic Explanation of Typescript Generics

A very basic explanation of generic function arguments

I've been using Cursor as my primary editor for over a year now, but recently I've heard wonderful things about Windsurf AI Agent features. I decided to record myself building out something I've always wanted to make, but never made the time for.

In this lesson, I demonstrate how to leverage Windsurf's powerful agent process to create a fun word-guessing game inspired by Heads Up. Watch as I build an interactive application featuring category selection and word navigation, complete with data hosting on GitHub Gists and deployment to GitHub Pages - all in under 30 minutes (before editing the lesson down to 12 minutes)!

What makes this project particularly exciting is how Windsurf eliminates the typical friction points of development. While this game was always on my project wishlist, the overhead of setup, configuration, and deployment made it hard to justify the time investment. Windsurf's agent process handles all these pain points seamlessly, from managing URLs to orchestrating deployment.

This lesson perfectly showcases how AI agents can help developers bring their backlog of project ideas to life, transforming what would typically be time-consuming tasks into efficient, enjoyable development experiences.

Build a Word Game with Windsurf's Cascade AI Agent



Discover how to harness the power of Cursor IDE's Composer Agent feature to optimize your code. In this lesson, you'll witness an AI agent doing all the work to generate test suites, implement performance benchmarks, and create optimized function variations - all without writing a single line of code. You'll learn how to validate performance improvements through data-driven benchmarking, ensuring that optimizations are backed by concrete metrics rather than speculation. This hands-on demonstration showcases a groundbreaking approach to automated function development that combines the precision of test-driven development with the efficiency of AI-powered optimization.


Agent-Driven Development in Cursor: Testing, Benchmarking, and Optimizing Functions

This course is aimed for using `zod` effectively in projects based on TypeScript (both browser and node.js). The benefits you gain with this course is not just simply coding, but also understanding when/why/how should you perform runtime validation.

`zod` is the missing piece to TypeScript's capabilities, which can guarantee type-safety only in compile-time.

`zod` can be used whenever the compiler cannot guarantee what happens in runtime. And... it's a very frequent usecase, such as HTTP calls, websockets, etc.

In this course you get quickly up and running by:
1. using `zod` with primitives and objects
2. adapting `zod` quickly to existing projects thanks to automatic generators
3. changing the strategy frm type-first to schema-first
4. using error-throwing `parse` or non-error-throwing `safeParse` basing on your needs
5. applying `zod` to the most common usecase - validating API responses
6. handling errors the most convenient way (out of many!)

Take advantage of runtime validation with `zod`. Take advantage of the detailed lessons in this course 🔥

Effective Runtime Type Checks with Zod


Cursor can now automatically run commands in the terminal and walk step-by-step towards building out your entire project. You give it a goal, then it will suggest the commands you need to run and the files that you need to create and you can work with it to achieve what you're building. This lesson does a quick walkthough of using a Cursor Agent to build a project from scratch and guide it along the way. Cursor Agents definitely feel like a sneak peek at the future of programming!

Cursor Agents Initial Impressions - Allow an AI to Build Your Entire Project

Mock Service Worker is an API mocking library that allows you to write client-agnostic mocks and reuse them across any frameworks, tools, and environments.



Mocking WebSocket APIs with Mock Service Worker


While using anonymous functions might seem convenient, they can create difficulties when trying to identify performance bottlenecks during profiling. This lesson will demonstrate how named functions make it easier to pinpoint and address performance issues, ultimately leading to more efficient and debuggable code. Learning this practice will greatly improve your ability to locate and fix performance issues in complex projects.

Always Name Functions in JavaScript


When attempting to load the same module twice in JavaScript you'll hit a cache and code won't re-run. In scenarios where you actually do want to have state in your modules, you'll have to use a cache-busting technique by passing a query parameter to a dynamic import. This lesson walks through how to add a query parameter, how to add the appropriate types for loading dynamic modules in TypeScript, and when these techniques are valuable.

Import the Same JavaScript Module Multiple Times with Cache Busting



The include keyword in GitHub Actions empowers you to add custom variables to your matrix strategy, providing flexibility beyond standard configurations. In this video, we'll explore how include allows you to define specific combinations of variables, enhancing control over your workflow runs. You'll see how this feature enables you to tailor jobs for unique environments or scenarios not covered by the default matrix options. By leveraging include, you can efficiently manage complex build processes with greater precision. This technique helps you streamline your CI/CD pipeline, making it more adaptable to your project's evolving needs.

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