Andrew Hansen

When To Use .ts And .tsx File Extensions?

When TypeScript released version 1.0 in 2014, it didn't include support for JSX syntax. At the time, React was still a young project that had not yet grown into the huge name it is today. So there was little incentive for the TypeScript team to include functionality 29 Jul 2022 2 min read react

What is the ! (exclamation mark / bang) operator in TypeScript?

Sometimes in a TypeScript codebase you might see code like this: const bar = myObject!.foo!.bar // or const obj = myObject! The exclamation/bang operator that comes after accessing a property (also called a "postfix bang") is known as a non-null assertion. The use case for this operator 15 Apr 2022 5 min read yarn

How to convert a string to a number in TypeScript?

You're writing a TypeScript application and you hit an error like this: Argument of type 'string' is not assignable to parameter of type 'number'.(2345) This could happen for a number of reasons. For example, I often run into this when reading a value 17 Jan 2022 3 min read react

Next.js vs. create-react-app: Which Should You Use For Your React Project?

Figuring out what library to use when starting a new React project is a struggle . There are a bunch of seemingly (hopefully) solid options out there mixed in with 20 different abandoned boilerplates with dependencies six months out of date.