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 …
How do I dynamically assign properties to an object in TypeScript ...
Learn how to dynamically assign properties to an object in TypeScript with this helpful guide.
typescript - What does the "as" keyword do? - Stack Overflow
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.
How to run TypeScript files from command line? - Stack Overflow
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, …
How to get a variable type in Typescript? - Stack Overflow
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 …
typescript - How can I define an interface for an array of objects ...
Yes, your example of defining an interface only for the particular items would be a more useful way to do it. It would be quite rare to have an array of items, but not want to conveniently …
typescript - Safe navigation operator (?.) or (!.) and null property ...
the operation a! produces a value of the type of a with null and undefined excluded Optional chaining finally made it to typescript (3.7) 🎉 The optional chaining operator ?. permits reading …
Typescript: Check "typeof" against custom type - Stack Overflow
Jul 26, 2018 · The syntax of TypeScript is such that some expressions and statements refer to values that exist at runtime, while other expressions and statements refer to types that exist …
TypeScript: Type 'string | undefined' is not assignable to type 'string'
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. …
vue.js - What does !: mean in Typescript? - Stack Overflow
Jun 22, 2018 · 84 That is a "definite assignment assertion": varname !: sometype informs typescript not to worry about checking if varname might be unassigned (it tells typescript that …