wreq | node-style require for the browser without a build step | Runtime Evironment library

deleteRows() is a method in the sheet class.

See if this works

The problem is that the _Bool prism only works when the value at key "b" is either True or False, not when it's Null. In essence, you're trying to change the type of the value from Null to Bool.

Probably, you want to use the _Primitive prism instead. Something like:

This is a known issue. To fix the RSA package that causes the build failure, create a file Config/nix/haskell-packages/RSA.nix and paste in the following content:

The type of the last argument to postWith in your snippet is [FormParam], and that type is what forces the Content-Type to be urlencoded.

To send JSON, send something of type Value or Encoding (from Data.Aeson).

I believe the issue is that if you try to put using a [FormParam], the method gets overridden and changed to POST. If you put a different kind of payload:

Ok guys - after I had a chance to look at the firmware I finally recognized that - even though 4 usb endpoints are published - I may only write on the Interrupt pipe endpoint and only read from the bulktransfer endpoint.

So, it is clear from the error provided above, that the installation was not able to find the libff file.

The best solution is to build the libff library manually and copy the required builds at the place it should be.

The best way to debug the problem is to look at the executed command closely and try to find the possible places where the libff should be...

Looking into the very 2nd error line, i.e. the complete command it was trying to execute here, I sighted the following options being executed

--extra-include-dirs=/usr/local/opt/readline/include --extra-lib-dirs=/usr/local/opt/readline/lib

In order to solve this, I looked for the required libff library and cloned it from GitHub. I cloned the required dependencies and places them in the directory it should be.

https://github.com/scipr-lab/libff

I then followed the "Build guide" to build the required library.

Then with the superuser on, I created the directories, /usr/local/opt/readline/lib and /usr/local/opt/readline/include, and it was solved. And pasted the required builds in it.

Used stack install again, and it worked.

Note: I thought many beginners may have similar problem while installing the required tools for their use. These small ideas may help them.

http://hackage.haskell.org/package/http-client-0.6.4/docs/Network-HTTP-Client-MultipartFormData.html#v:partBS to create a Part from a ByteString and then we can post a [Part] because it's an instance of Postable.