TypeScript: Is there a way to check infinite nested array type?

Question

Here is an example

The basic idea is - I have a type which can be plain object, or array of objects.

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

And I have structure like this:

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

How I can restrict each element of this nested array with:

type Item = { name: string };

thx

Nguyen Phong Thien · Accepted Answer · 2019-02-22 07:56:24Z

12

You can't use type because type cannot repeat itself. But you can use interface

This is the interface match your area constant

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

answered Feb 22, 2019 at 7:56

Nguyen Phong Thien

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