Object.keys(obj) array to string literal types

object.keys_literal_types.ts

// don't use this. I'm not sure if this is a good solution
// keeping it as notes till I find a better solution

// assume you got this from a JSON file:
const statesWeather = {
  "wisconsin": "cloudy",
  "california": "rainy",
  "newyork": "sunny",
  "florida": "cloudy",
  "texas": "rainy",
}

const states = Object.keys(statesWeather) as Array<keyof typeof statesWeather>

type State = typeof states[number]

const test: State = 'wisconsin'
// ✅  'const test: "wisconsin" | "california" | "newyork" | "florida" | "texas"'

// what if you want an object like this?
const attempt_one: Record<State, string> = { wisconsin: '' }
// ❌ Type '{ wisconsin: string; }' is missing the following properties from type 'Record<"wisconsin" | "california" | "newyork" | "florida" | "texas", string>': california, newyork, florida, texas ts(2739)

// possible solution:
type DeepPartial<T> = { [K in keyof T]?: DeepPartial<T[K]> }

const solution: DeepPartial<typeof statesWeather> = {
  wisconsin: '', // ✅
}

const solution_verify: DeepPartial<typeof statesWeather> = {
  wisconsin: '', // ✅
  alaska: '', // ❌
  // Type '{ wisconsin: string; alaska: string; }' is not assignable to type
  // 'DeepPartial<{ wisconsin: string; california: string; newyork: string; florida: string; texas: string; }>'.
  // Object literal may only specify known properties, and 'alaska' does not exist in type
  // 'DeepPartial<{ wisconsin: string; california: string; newyork: string; florida: string; texas: string; }>'.ts(2322)
}

const alternative_solution: DeepPartial<Record<State, string>> = {
  wisconsin: '', // ✅
}

const alternative_solution_verify: DeepPartial<Record<State, string>> = {
  wisconsin: '', // ✅
  alaska: '', // ❌
  // Type '{ wisconsin: string; alaska: string; }' is not assignable to type
  // 'DeepPartial<Record<"wisconsin" | "california" | "newyork" | "florida" | "texas", string>>'.
  // Object literal may only specify known properties, and 'alaska' does not exist in type
  // 'DeepPartial<Record<"wisconsin" | "california" | "newyork" | "florida" | "texas", string>>'.ts(2322)
}