h-unterp/ts_repro

Understanding limitations of UDF's with faunadb-js

Instructions:

1. Supply admin key of an already existing DB in .env as FAUNA_SECRET
2. npm install
3. tsc
4. node lib/function.js

Why? Because it was not clear to me how faunadb-js handles non-supported features of javascript or typescript:

in src/funcdef.ts

Let({ thing1: arg as Thing }, 
    Var("thing1")
);

Gets transpiled into a UDF as

Query(Lambda("ref", Let({ thing1: Var("ref") }, Var("thing1"))))

I wish it failed more explicitly during compilation.

That said, if you want to take advantage of features of ts/js in a UDF then you would need to implement them before calling query eg:

client
  .query(Call(Function("let_test"), "hey" as Thing))
  .then((response) => console.log(response));

This would fail, but it is just to demonstrate where it should be used.