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 …

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.

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. …

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, …