JSON Modules in JavaScript
The ECMAScript modules system (import and export keywords) by default can import only JavaScript code. But it's often convenient to keep an application's configuration inside of a JSON file, and as result, you might want to import a JSON file directly into an ES module. For a long time, importing JSON was supported by commonjs modules format. Fortunately, a new proposal at stage 3 named JSON modul
Covariance and Contravariance in TypeScript
Learning covariance and contravariance in TypeScript could be tricky (I know from my experience!), but knowing them is a great addition to understanding types and subtyping. In this post, you'll read an accessible explanation of covariance and contravariance concepts. 1. Subtyping Subtyping is a form of polymorphism in which a subtype is associated with a base type by some form of substitutability
JavaScript Promises: then(f,f) vs then(f).catch(f)
What's the difference between promise.then(fn, fn) and promise.then(fn).catch(fn) when using JavaScript promises?
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