Tutorials covering the frameworks and libraries that shape how modern applications are built — Angular, React, Vue, and the ecosystem tools that surround them. Each chapter is standalone, built around real examples and verified facts.
Keyboard navigation is not an optional enhancement layered on top of a mouse-driven interface. It is the primary interaction model for screen reader users, power users, and anyone who cannot use a pointing device. In React, the challenge is that focus is a property of the DOM, not of component state. React’s declarative model renders…
A Vue component library is not an application. The default Vite build treats the project as an app: it reads index.html, bundles every dependency, and produces a deployable website. Library mode changes the build target from a deployable page to a publishable package. The build.lib option in vite.config.ts tells Vite to use the library entry…
A production build is not just a minified version of the development build. It is a different artifact. The bundler removes code that is never used, renames variables to shorter names, and splits the application into chunks. The process that removes the unused code is called tree shaking. The process that finds what is left…
React’s JSX escaping is a powerful default, but it is a narrow one. Every value interpolated inside curly braces—{userInput}—is converted to a text node, so a string like <script>alert(1)</script> renders as literal characters rather than executing . This single default has prevented more reflected and stored XSS than almost any other framework decision. The problem…
TypeScript declarations for a Vue component library are not optional. A consumer that imports MyButton from the library needs to know the shape of its props, the events it emits, and the slots it exposes. Without .d.ts files, the consumer gets any, and the editor’s autocomplete and type checking stop at the import boundary. vue-tsc…
Images and fonts are the two heaviest static resources in most Angular applications. A single unoptimized hero image can weigh more than the entire JavaScript bundle. A web font that arrives late causes text to flicker and shift. The NgOptimizedImage directive was introduced in Angular 16 to automate image loading best practices, and font optimization…
React DevTools Profiler is a measurement instrument, not a debugging console. It records what actually happened during a render cycle—which components rendered, how long each took, and why they rendered—and presents that data as a flamegraph or a ranked list. The value of the tool is that it replaces guesswork with evidence. A developer who…
Vue’s template compiler is not a closed pipeline. The transform stage—the phase between parsing the template into an AST and generating the render function—is built from an array of nodeTransforms functions that run on every node, and a map of directiveTransforms that run on specific directives. A custom compiler plugin is a function inserted into…
Every Angular application that ships without tests is an application that ships with unknown defects. The tests are the specification. They describe what the code is supposed to do. When the code changes, the tests tell you whether the change broke something. When a new developer joins the team, the tests are the documentation of…
Production builds are not a single command but a sequence of decisions: which bundler processes the source, which environment variables are embedded at build time, and where the resulting artifacts are served from. React’s development build includes warnings and debugging tools that are intentionally removed in production; the production build is typically two to three…