Type to require elements of array to all have one property or the other

I'm looking for a type that will force all elements of the array to have 1 property or the other example

interface ColumnCommon {
  id: string;
}


type WidthedColumn = ColumnCommon & { width?: Length; };
type WeightedColumn = ColumnCommon & { weight?: number; };

type Columns = Array<WidthedColumn> | Array<WeightedColumn>

interface ColumnCommon {
  id: string;
}


type WidthedColumn = ColumnCommon & { width?: Length; };
type WeightedColumn = ColumnCommon & { weight?: number; };

type Columns = Array<WidthedColumn> | Array<WeightedColumn>

so here I need two things 1. one column can't have both weight and width 2. all columns in the array should have the same property (weight or width)

3 Replies

Scot•3y ago

does the above not work? hmm

julius•3y ago

you need to assign the other prop as never

julius•3y ago

https://tsplay.dev/wgQ89m

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Type to require elements of array to all have one property or the other