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John Papa[^]:
Finding errors earlier and more easily is one of the advantages of TypeScript. You can use optionally static typed (optionally) variables, functions, objects to help detect possible mismatches in your code right in your editor. Simply add the appropriate type or define an interface for more complex and custom types, and you are off and running! Defining types is by far my favorite feature of TypeScript.

Types are still optional, but this is a nice option if you're the typed type type.