Discussion on: Is 2019 the year of TypeScript?

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Replies for: I get the feeling Martin meant 3rd party libraries that don't have typings defined (if written in JavaScript) or are written in Typescript but don'...

Right, It made more sense after reading more about it. I think the discoverability in general is such a nice thing you get by going with static types that is almost worth it by that alone haha

Sean G. Wright • Sep 20 '19

Another nice thing about Typescript is how the types "flow" through the application.

Often I only need to annotate a couple of parameters, variables, methods.

Then when using those things the rest of my code is able to infer the results of operations.

For example:

function getName() {
  return 'lalo';
}

const name = getName();

Notice, there are 0 type annotations here...

But, Typescript knows that name is a string and anywhere I use name, either as a parameter or in an assignment or expression, Typescript will flow that string type to the next place I'm working with name.

A lot of developers when first using Typescript will add a ton of annotations to their code, only to realize later that Typescript is great at inferring type information and doesn't need us to be so explicit.