Checklist

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• Read and understood the [Code of Conduct][code-of-conduct].
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Description

Description of the issue.

The following code produces an array whose shape does not match what I'd expect:

check if NNNNNNN-DD.AAAA.JTR.OOOO is valid.

ref: CNJ unifica numeração de processos em todo o país

Here we're re-exporting methods of ethjs-util:

https://github.com/ethereumjs/ethereumjs-util/blob/3b1085059194b02354177d334f89cd82a5187883/src/index.ts#L2-L5

But because they're manually added to the exports object, typescript is not adding type definitions for them and Typescript users get an error when using one of those methods, e.g. stripHexPrefix.

Each function in documentation have example demonstrating the usage of the function. Would be great if could come up with the way how to execute these examples inline and directly inside the documentation.