Tutorials on Typescript Library

In the dynamically progressing tech industry of today, staying relevant requires developers to be well-versed with the most recent tools and technologies. A combination that's experiencing a surge in popularity and demand is React combined with TypeScript. Any developer aspiring to secure a position in a React-focused role must possess a strong grasp of TypeScript. This article discusses why the integration of React with TypeScript is the current trend and offers insights on how to acquire and excel in this potent duo. The demand for React developers skilled in TypeScript is seeing an upward trend. A large number of job advertisements for React or front-end development positions now necessitate the knowledge of TypeScript. But why is this duo becoming more sought-after in the industry? Let's delve into the technical advantages offered by the amalgamation of React with TypeScript. TypeScript introduces the concept of static typing, facilitating type checking during the compilation phase. This allows the early detection of errors, thereby enhancing code reliability and minimizing bugs. Here's an instance to illustrate the difference between JavaScript and TypeScript in terms of type safety: JavaScript: TypeScript: As evident, TypeScript identifies the type discrepancy and raises a compilation error, averting unexpected behavior during runtime. TypeScript's rigid type checking and lucid type annotations result in a codebase that is easier to understand and maintain. This is especially beneficial for large-scale applications and teams. Here's an example using component props in React to illustrate this: JavaScript: TypeScript: By defining the prop types explicitly, TypeScript ensures that the name prop will always be a string, reducing the risk of runtime errors. TypeScript integrates seamlessly with modern JavaScript tools and frameworks. It supports ES6+ features and is compatible with build tools like Webpack, Babel, and ESLint. Here's an example of an ESLint configuration for TypeScript: JavaScript: TypeScript: By utilizing the TypeScript parser and extending the appropriate ESLint plugins, you can leverage powerful linting rules specific to TypeScript. The union of React and TypeScript addresses numerous challenges associated with building large-scale, maintainable web applications. The considerable benefits it provides explain why React with TypeScript is becoming a dominant force in the contemporary web development scenario. Given the significance of mastering React with TypeScript, the question arises: How do we learn this powerful combination? While comprehensive resources might be scarce online, don't worry! There's a course designed to guide you through this learning journey. The Master Custom React Hooks with TypeScript course aims to help you construct an advanced React Hook with TypeScript. With step-by-step lessons and live coding examples under the guidance of full-stack software engineer Chris Frewin, this course ensures effective understanding and application of the concepts. By the end of the course, participants will have developed a clean React Hook, published it to npm, and gained insights into the best practices for using TypeScript with React Hooks.

Are you a React developer interested in enhancing your skill set with TypeScript? Or perhaps you're a beginner in React and are keen to explore how TypeScript can be utilized for intricate patterns? Fear not! This article is for both beginners and seasoned React developers alike. The purpose of this article is to simplify the process of using TypeScript with React, providing you with essential resources to boost your web development journey. Let's start by understanding the steps to set up a new React project using TypeScript. By the end of this article, you'll have a robust foundation for creating scalable and user-friendly applications. To kick off, ensure Node.js and npm are installed on your system. If not, download them from nodejs.org . Once installed, execute the following command to initiate a new React project with TypeScript: This command utilizes create-react-app , a tool designed to bootstrap React applications with minimal configuration, to create a new React project named my-react-app using the TypeScript template. Once the project is generated, you'll observe a predefined structure. Understanding this structure will help you navigate the project efficiently. Below is a brief overview of the primary directories and files: Now, let's dive into the creation of React components using TypeScript. We'll begin by developing a simple Greeting component that shows a greeting message by accepting a name prop. To do so, follow these steps: In this code snippet, the GreetingProps interface is defined to type the props for the Greeting component. The React.FC<GreetingProps> notation indicates that Greeting is a functional component with props of type GreetingProps . By following these steps, you'll integrate a TypeScript-based React component into your application. TypeScript is popular for its static type checking feature, which helps in catching errors early in the development process. To modify type checking and enforce coding standards, integrate ESLint with TypeScript by following the steps below: With these configurations, you can now execute npm run lint to perform linting and type checking on your TypeScript files. TypeScript has several advanced features that can elevate your React development experience. In this article, I will touch on two of them: Generics promote the creation of reusable components with flexible types. In the following example, I will develop a resuable List component that accepts an array of items of any type and renders them: When TypeScript is used with React's Context API, it allows for type-safe context values. Here's an example: By leveraging these two (among many) advanced TypeScript features, you can create more flexible and type-safe React components. TypeScript integrates flawlessly with popular testing libraries like Jest and React Testing Library. To set up testing in your project, follow these steps: In this article, we saw the process of setting up a React project with TypeScript, creating React components with TypeScript, leveraging advanced TypeScript features, and testing with TypeScript. The guidelines in this article will equip you with the knowledge to start working and to develop robust and maintainable React applications. If you're interested in diving deeper into the world of React Hooks and TypeScript, I highly recommend the course Master Custom React Hooks with TypeScript by me (Chris Frewin). This comprehensive course covers everything from building custom React Hooks with TypeScript to publishing them on NPM. Learning React and TypeScript doesn't have to be overwhelming. With the right resources and guidance, anyone can master these technologies and excel in their web development journey. So, why wait? With me, begin your journey in the dynamic world of React and TypeScript today!

npm centralizes third-party, open-source Node.js packages and libraries within a large, online registry. Contributing to the Node.js ecosystem involves no vetting process, which lets anyone publish packages to the npm registry with little effort. Not only has npm's short process for publishing packages led to the explosive growth of the Node.js ecosystem, but also fosters the development of various types of packages: front-end libraries/frameworks, tooling, bundlers, routers, state management, etc. However, this comes at the cost of more packages being released with more security vulnerabilities and less reliability. Despite these concerns, npm continues to introduce new features and statistics for helping developers identify high quality packages. A library author uses npm's command line client to publish their library's package to the npm registry and share it. Once published, npm allows developers to update their projects' dependencies with the latest version of this package or install this package within their projects. Below, I'm going to show you how to publish a package to the npm registry. I will demonstrate this with the rgb-hex TypeScript library. It will be modified accordingly to get it ready for publishing. To get started, you must have an npm account. If you do not have an npm account, sign up for an account here . Within the root of the package directory, run the following command in the terminal: Logging into your account associates your package with your account. You will be prompted to enter your npm username, password and e-mail address. When you publish a package to the npm registry, there are some files and directories, such as a testing suite and coverage reports, that can be omitted from the package. A testing suite validates your library's functionality and coverage reports inform you of areas in your code that lack tests. They are not required for end users to consume your library within their projects. The main benefit of excluding files with .npmignore is reducing the number of files and directories the end user downloads when fetching your package from npm. Ideally, end users should be able to quickly download your package, and your package should not take up unnecessary space on their machines. If your library uses the Jest testing framework, then you would add the __tests__ and coverage directories to the .npmignore file. ( .npmignore ) To further reduce the number of files within the package, you can exclude formatting-related configuration files, such as .eslintrc.js , .prettierrc and .editorconfig . ( .npmignore ) Just think about which files and directories are needed within the package to allow end users to use your library. Whichever files and directories are not necessary should be added to the .npmignore file. Note : If the project contains a .gitignore file, then the files and directories listed within the .gitignore file will automatically be excluded from the package. Alternatively, you could list the files to include within the package via package.json 's files property. The entry point of your library indicates the file from which execution begins when the library is imported. By default, npm searches for a main property inside of the package.json file to determine the package's entry point. For tooling that supports ESM modules, you can define a module property that points to the package's .mjs file. Note : module is not an official package.json property. It is a proposal for ES6 module interoperability in Node.js. Read more about it here . Commonly, your library's generated build will be outputted to a build or dist directory. Therefore, the main and module properties should point to files within either of these directories. ( package.json ) To verify the package's contents before publishing to npm (and whether or not the .gitignore and .npmignore files filter out the correct files and directories), create a tar archive of the package. This tar archive contains all of the files and directories that will end up in the published package. To generate the tarball, run the following command: In the current directory, you will find a tar file named <package-name>-v<version>.tgz . package-name comes from the name property of package.json , and version comes from the version property of package.json . To extract and list its contents, run the following command: The tar -xzf command deposits the contents into a directory named package . Here, we can see that the package.json file, README.md file and dist directory are included. Lastly, to publish the package to npm, run the following command: When prompted to enter a version, press enter to use the version mentioned in the package.json file. If you run into the following error message, then you will need to enable two-factor authentication for your npm account: To enable two-factor authentication, visit your npm account's "Account Settings" page and click the "Enable 2FA" button under the "Two Factor Authentication" section. After you enter your password, npm redirects you to a wizard that walks through the process of enabling two-factor authentication. Enable two-factor authentication for both authorization and updating/publishing packages. Scan the QR code with an authenticator app like Authy . Verify that Authy successfully registered npm by entering a six-digit code generated by Authy. Once two-factor authentication is successfully enabled, you will be shown recovery codes. Save them to a new, empty text file. Without these codes, it will not be possible to recover your account in the event that you are not able to provide the one-time password. Return to the terminal and re-enter the npm publish command. Once your package has been published to npm, you can navigate to your package's page at npm's website. Try publishing your own packages to npm. You can also check out our new course, The newline Guide to Creating React Libraries from Scratch , where we teach you everything you need to know to succeed in creating a library.