Why use triple-equal (===) in TypeScript? - Stack Overflow
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 …
In TypeScript, what is the ! (exclamation mark / bang) operator …
Feb 16, 2017 · In TypeScript, what is the ! (exclamation mark / bang) operator when dereferencing a member? Asked 8 years, 5 months ago Modified 2 months ago Viewed 641k …
What's the meaning of "=>" in TypeScript? (Fat Arrow)
In TypeScript, everything that comes after the : but before an = (assignment) is the type information. So your example is saying that the type of MakePoint is a function that takes 0 …
Does Typescript support the ?. operator? (And, what's it called?)
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 …
typescript - 'unknown' vs. 'any' - Stack Overflow
Jul 20, 2018 · 871 TypeScript 3.0 introduces unknown type, according to their wiki: unknown is now a reserved type name, as it is now a built-in type. Depending on your intended use of …
TypeScript: Type 'string | undefined' is not assignable to type …
Feb 2, 2019 · Alternatively, you can type name1 as string | undefined, and handle cases of undefined further down. However, it's typically better to handle unexpected errors earlier on. …
What is TypeScript and why should I use it instead of JavaScript?
What is the TypeScript language? What can it do that JavaScript or available libraries cannot do, that would give me reason to consider it?
javascript - typescript - cloning object - Stack Overflow
Jan 26, 2015 · Since TypeScript 3.7 is released, recursive type aliases are now supported and it allows us to define a type safe deepCopy() function: // DeepCopy type can be easily extended …
What does the `is` keyword do in typescript? - Stack Overflow
Typescript needs to know that the function into which you pass an object is functioning like a type guard. If it just returns type true or false, how can Typescript know that it's indeed a type guard …
javascript - Typescript: React event types - Stack Overflow
What is the correct type for React events? Initially I just used any for the sake of simplicity. Now, I am trying to clean things up and avoid use of any completely. So in a simple form like this: ...