utility-types VS ts-essentials

There are a bunch of awesome type utility libraries that may boost your works on types, like ts-toolbelt, utility-types, SimplyTyped, etc., which you can already use.

With these powerful features, you can create dynamic and expressive types. One last thing I want to mention before moving on, is that you can install libraries with which you can add more types to your project like type-fest or utility-types. These libraries contain a lot of useful types that you can use in your project.

"Collection of utility types, complementing TypeScript built-in mapped types and aliases (think "lodash" for static types)." with 1.3M weekly downloads

I am guessing that since it does not exists as an built in type, in utility-types, or in ts-toolbelt that it currently isn't possible.

You can also check out projects like https://github.com/piotrwitek/utility-types which also bring a lot of value and easy to use.

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There is something similar here: https://github.com/piotrwitek/utility-types, but it hasn't been updated since TS 3.7 and there is a LOT more that can be done with TypeScript since 3.7. Mainly variadic tuples and template literal types.

Also, it’s not as restrictive as mutability tools — if you know what you are doing and want to ignore this limitation for a particular case, you can apply the -readonly modifier or the Writeable type from type-fest or ts-essentials.

True a readonly array would help, or even better yet deep readonly (which comes with ts-essentials) when dealing with non-primitive arrays