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

Feb 16, 2017 · It is explained in the TypeScript release notes: A new ! post-fix expression operator may be used to assert that its operand is non-null and non-undefined in contexts …

Sep 5, 2019 · The @typescript-eslint/no-unused-vars rule was enabled by default in the next/typescript configuration. By explicitly setting this rule to "off", you prevent it from flagging …

Object types An object in JavaScript is a key/value map, and an "object type" is typescript's way of typing those key/value maps. Both interface and type can be used when providing types for …

May 28, 2020 · When you create a class in TypeScript, the name of that class refers to both the instance type and the Javascript class value. If you reference that class as a type, TypeScript …

Jul 20, 2019 · See TypeScript non-goal number 7: Introduce behaviour that is likely to surprise users. Instead have due consideration for patterns adopted by other commonly-used …

Sep 24, 2016 · 235 How can I tell what version of TypeScript is being used in Visual Studio Code? In particular, I had been using TypeScript 1.8.10 and VSCode 1.4.0. I first updated …

Aug 16, 2021 · I am getting the error/warning from ESLint that 'd' is declared but never used, however I need this type declaration in function parameter to avoid subsequent TypeScript …

Here is how to get to the bottom of it: A. To check which versions of Typescript are installed with your Visual Studio/MSBuild, inspect contents of C:\Program Files (x86)\Microsoft …

the never type represents the type of values that never occur: The Typescript compiler assigns types to all your variables/properties. These types can be either the typescript defined types …