Closed 55 mins ago.

TypeScript types are only enforced at compile time and do not exist at runtime. Given this, if I define a TypeScript function that accepts a string parameter, is it necessary to perform null checks? This question arises because if the API returns null, it could lead to runtime errors.

Let me give more context. In a previous monorepo, we could load any microservice in Intellij IDE (java based) and it would load the microservice and all libraries it depended on. Basically, we loaded SLICES of the monorepo instead of the whole thing which is WAY faster to develop so you keep working like it is a polyrepo with speed(even though it is not). In this way, I could go through all the code related to microservice A without loading the entire code base of the company (13 microservices and around 20 libraries). Builds were blazing fast too when just changing one microservice as it only built that thing. Only when you changed a library did it take slightly longer as it then built 3 microservices using it (build increased to about 5 minutes). On a full build touching a library everyone had, it was 15 minutes but we had not parallelized the builds yet.

I’m encountering an issue with a custom LoadingButton component in my React TypeScript project using the Material-UI (MUI) library. The problem arises when I use this LoadingButton within a form that has an onSubmit event handler. The LoadingButton has a type=”submit”, and when I click on it, the form’s onSubmit event function does not get executed. However, if I remove the setLoading(true) call from the handleClick function of the LoadingButton, the form submission works as expected.

I am trying to use spread operator in my react+typescript app but it says “Type ‘object | null’ must have a ‘Symbol.iterator’ method that returns an iterator.”

I have these types

I have a function below: