Jul 20, 2019 · In JavaScript, it's commonly seen as best practice to use === instead of ==, for obvious and well-known reasons. In TypeScript, which is one to be preferred? Is there even one which is …

The ?? operator was added to TypeScript 3.7 back in November 2019. And more recently, the ?? operator was included in ES2020, which is supported by Node 14 (released in April 2020).

What is the TypeScript language? What can it do that JavaScript or available libraries cannot do, that would give me reason to consider it?

Jan 17, 2017 · Yes. As of TypeScript 3.7 (released on November 5, 2019), this feature is supported and is called Optional Chaining: At its core, optional chaining lets us write code where TypeScript can …

Feb 16, 2017 · It tells TypeScript to leave the expressions result as it is and pass it to JavaScript. It allows the use of JavaScript semantics in TypeScript, such as using loose equality (with the …

Nov 5, 2015 · None of the other answers discuss how to run a TypeScript script that uses modules, and especially modern ES Modules. First off, ts-node doesn't work in that scenario, as of March 2020. So …

What does the ampersand (&) mean in a TypeScript type definition? Asked 9 years, 6 months ago Modified 1 year, 2 months ago Viewed 97k times

Jun 17, 2020 · Double double questionmarks in TypeScript Asked 5 years, 7 months ago Modified 5 months ago Viewed 89k times

Apr 3, 2018 · What does the <T> mean? That is TypeScript's Generics declaration. Excerpt: A major part of software engineering is building components that not only have well-defined and consistent …

Update March 2021: The newer TypeScript Handbook (also mentioned in nju-clc answer below) has a section Interfaces vs. Type Aliases which explains the differences. Original Answer (2016) As per the …