Function createContext

createContext<T>(): Context<undefined | T>
Creates a new context with no default value, thus making its default value undefined.
Type Parameters
- T
  Context value type.
Returns Context<undefined | T>
createContext<T>(defaultValue: T): Context<T>
Creates a new context with a default value.
Type Parameters
- T
  Context value type.
Parameters
- defaultValue: T
Returns Context<T>