Jul 20, 2019 · TypeScript cannot redefine == without breaking all JavaScript code that relies on its behavior (despite this having sad implications for 3). This also implies that TypeScript cannot …

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 …

What does the ampersand (&) mean in a TypeScript type definition? Asked 9 years, 4 months ago Modified 1 year ago Viewed 97k times

Feb 16, 2017 · In TypeScript, what is the ! (exclamation mark / bang) operator when dereferencing a member? Asked 8 years, 9 months ago Modified 6 months ago Viewed 654k …

export function foo(arg: string): arg is MyType { return ... } I haven't been able to search for is in either the docs or google, it's a pretty common word and shows up on basically every page. …

The key aspect to interfaces in typescript that distinguish them from types is that they can be extended with new functionality after they've already been declared.

Learn how to dynamically assign properties to an object in TypeScript with this helpful guide.

Apr 21, 2019 · The as keyword is a type assertion in TypeScript which tells the compiler to consider the object as another type than the type the compiler infers the object to be.

Feb 22, 2016 · 10 Type guards in typescript To determine the type of a variable after a conditional statement you can use type guards. A type guard in typescript is the following: An expression …

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, …