import { Either, type IEither } from "@emprespresso/pengueno";

export const getRequiredEnv = (name: string): IEither<Error, string> =>
  Either
    .fromFailable<Error, string | undefined>(() => Deno.env.get(name)) // could throw when no permission.
    .flatMap((v) =>
      (v &&
        Either.right(v)) ||
      Either.left(
        new Error(`environment variable "${name}" is required D:`),
      )
    );