Question

Give an array, transform into an object type and the key/value must in the given array.
For example

const tuple = ['tesla', 'model 3', 'model X', 'model Y'] as const
type result = TupleToObject<typeof tuple> // expected { tesla: 'tesla', 'model 3': 'model 3', 'model X': 'model X', 'model Y': 'model Y'}

Answer

type TupleToObject<T extends readonly any[]> = {
  [K in T[number]]: K;
}