Add SetNonNullable type

[sindresorhus]

#199

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[falkenhawk]

looking forward to this to be included 👍

[sindresorhus]

#245

[joealden]

@sindresorhus do you think this type needs to deal with optionality? We have the following type in our codebase at work:

type SetNonNullable<
  BaseType,
  KeysToSet extends keyof BaseType = keyof BaseType
> = {
  [Key in keyof BaseType]: Key extends KeysToSet
    ? NonNullable<BaseType[Key]>
    : BaseType[Key];
};

So I'm wondering if we'd all be happier with the naming of this if it more closely followed the behaviour of NonNullable?

[sindresorhus]

@joealden It should work like NonNullable, so not deal with property optionality.

[joealden]

I believe this can be closed now that #431 has been merged?

[kachkaev]

yeah this can be closed I guess