parse validation using async function

[llermaly]

Hello, is it possible to validate rows using an async function (like consulting database) and what is the best way to do it? I'm trying without success.

    parse(value) {
      const exists = findInDatabase(value) //async
      if (!exists) {
        throw new Error("Error");
      }
      return value;
    }

[catamphetamine]

Hello, is it possible to validate rows using an async function (like consulting database)

No.

what is the best way to do it?

Nothing special about that: first read the data from a file and then validate it as a separate function call.