Extract Generic

/**
  * Extract a generic of a type
  **/

// Your type
type TypeWithGeneric<T> = T[]

// Extract a generic from a type (helper)
type ExtractGeneric<Type> = Type extends TypeWithGeneric<infer X> ? X : Type

// Use
type extracted = ExtractGeneric<TypeWithGeneric<number>>

Source: https://stackoverflow.com/questions/44851268/typescript-how-to-extract-the-generic-parameter-from-a-type

• generic
• Typescript