Can TypeScript provide a method for verifying infinite levels of nested arrays within a type?

Check out this example

The concept behind this is having a type that can either be a single object or an array of objects.

type SingleOrArray<T> = T | T[];

The structure in question looks like this:

const area: ItemArea = [
  { name: 'test1' },
  { name: 'test2' },
  [
    { name: 'test3' },
    { name: '&l&apos, test4' },
    [
      { name: 'test5' },
      { name: 'test6' },
      [
        { name: 'test7' },
      ]
    ]
  ]
];

How do I enforce the restriction that each element in this nested array must adhere to the following type:

type Item = { name: string };

Thank you.

Answer №1

Using the type keyword is not viable as it cannot be duplicated. However, you have the option to utilize the interface instead.

This will define the interface that corresponds with your constant area.

interface ItemArea {
    [n: number]: {
        name: string
    } | ItemArea;
};

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