Create union type from object array

create-union-from-object-array.ts

const sizes = [
  { variant: 'sm', value: 8 },
  { variant: 'md', value: 16 },
  { variant: 'lg', value: 24 },
] as const

type SizeKey = keyof typeof sizes[number] // "variant" | "value"
type SizeVariant = typeof sizes[number]['variant'] // "sm" | "md" | "lg"
type SizeValue = typeof sizes[number]['value'] // 8 | 16 | 24