ReScript FFI example bindings for ethers.

Ethers.res

@module("ethers") external decodeBase58Unsafe: string => bigint = "decodeBase58"

@get external code: Js.Exn.t => string = "code"
@get external argument: Js.Exn.t => string = "argument"
@get external value: Js.Exn.t => string = "value"
@get external shortMessage: Js.Exn.t => string = "shortMessage"

type decodeBase58Error =
  | UnknownError
  | InputError({
      code: string,
      argument: string,
      value: string,
      shortMessage: string,
    })

let decodeBase58 = s => {
  try {
    Ok(decodeBase58Unsafe(s))
  } catch {
  | Js.Exn.Error(err) =>
    Error(
      InputError({
        code: code(err),
        argument: argument(err),
        value: value(err),
        shortMessage: shortMessage(err),
      }),
    )
  | _ => Error(UnknownError)
  }
}

Ethers.resi

let decodeBase58Unsafe: string => bigint

type decodeBase58Error =
  | UnknownError
  | InputError({
      code: string,
      argument: string,
      value: string,
      shortMessage: string,
    })

let decodeBase58: string => result<bigint, decodeBase58Error>