Proposal for ModifyType ?

[sindresorhus]

Proposal for ModifyType ?

[devinrhode2]

Here's another approach:

type TOrder = {
  id: string;
  assignedTo?: unknown;
}

// today:
type modifiedObject = Omit<TOrder, 'assignedTo'> & {
  assignedTo: string;
};

// would like:
type ModifyPropertyType<
  TObject extends Record<string, any>,
  TProperty extends keyof TObject,
  TNewType,
> = Omit<TObject, TProperty> & {
  [x in TProperty]: TNewType;
};



type modifiedObject2 = ModifyPropertyType<TOrder, 'assignedTo', string>;

// v2:
type ModifyPropertyType2<
  TObject extends Record<string, any>,
  TObjectPatch extends Record<string, any>
> = Omit<TObject, keyof TObjectPatch> & {
  [x in keyof TObjectPatch]: TObjectPatch[keyof TObjectPatch];
};

type modifiedObject3 = ModifyPropertyType2<TOrder, { assignedTo: string }>;

[devinrhode2]

I might prefer to write this code with Merge

[devinrhode2]

I've been using Merge<obj, { prop: NewType }>, maybe nicer than ModifyPropertyType