Key should never be @undefined

[christianbundy]

const crypto = require("crypto");
const secretStack = require("secret-stack");

const appKey = crypto.randomBytes(32).toString("base64");

const stack = secretStack({ appKey });

const app = stack();

console.log(app.id); // => "@undefined"

[staltz]

Note to self:

We should require (TS) config.keys and/or emit a (JS) warning when it's missing.

[austinfrey]

I took a swing at this based on your note @staltz , #67. A new error is logged when no keys are passed in along with the config and updated the Config type in types.d.ts. Not sure how I feel about the log since it's going to make a lot of tests throughout the ecosystem very noisy. Thoughts?

[staltz]

@austinfrey Thanks for the PR! :)
What mix said over there is what I would say too