Thanks!

Does the example code for that module in the guide work _without_ adding 
the module to `:extra_applications` because I'm running it on my 'dev' 
computer? In the test project I used, there are NO (explicit) Mix deps, so 
I don't _think_ `crypto` could be being pulled in via some other dependency.

On Tuesday, September 21, 2021 at 11:39:25 AM UTC-4 José Valim wrote:

> The wording here is definitely confusing. Erlang is a collection of 
> applications and crypto is one of them. You need to include all of Erlang 
> applications, outside of "kernel" and "stdlib" apps, in extra_applications. 
> I will clarify the guides. Thanks!
>
>
> On Tue, Sep 21, 2021 at 5:33 PM Kenny Evitt <kenny...@gmail.com> wrote:
>
>> On the Erlang libraries page of the current guide, for the `crypto` 
>> module 
>> <https://elixir-lang.org/getting-started/erlang-libraries.html#the-crypto-module>
>> :
>>
>> > The `:crypto` module is not part of the Erlang standard library, but is 
>> included with the Erlang distribution. This means you must list `:crypto` 
>> in your project’s applications list whenever you use it. To do this, edit 
>> your `mix.exs` file to include:
>> >
>> > ```
>> > def application do
>> >   [extra_applications: [:crypto]]
>> > end
>> > ```
>>
>> But in a reply on a recent Elixir Forum post 
>> <https://elixirforum.com/t/help-with-reading-typespecs-for-erlang-crypto-module/42423/7>,
>>  
>> someone claimed:
>>
>> > `:crypto` is a part of and is distributed with Erlang/OTP ...
>>
>> And that doesn't seem to contradict what's in the Getting Started guide.
>>
>> But I'm confused as to why that module should be added to the 
>> `:extra_applications` key. I just tried running the example code from the 
>> guide in a 'scratchpad' project that has NO (explicit) Mix deps, and only 
>> `:logger` listed in `:extra_applications` and the code worked fine in 
>> `iex`. Does that code work because I'm running it on my 'dev' computer? 
>> Would NOT adding `:crypto` to `:extra_applications` present a problem were 
>> I to deploy that project's code to another computer?
>>
>> Or is `crypto` now (somehow) part of "the Erlang standard library"?
>>
>> I'm just curious! But, if the guide is now incorrect about this, I'd be 
>> happy to submit a PR with any suitable changes.
>>
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>>
>

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