20 jul. 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 …

17 jan. 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 …

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

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. …

16 feb. 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 …

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 …

21 apr. 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.

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5 nov. 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 …

7 apr. 2016 · Is key-value pair available in TypeScript? If so, how do I do that? Can anyone provide sample, example, or links?