Tree path array

约 169 字小于 1 分钟

2026-02-11

题目

Create a type Path that represents validates a possible path of a tree under the form of an array.

Related challenges:

Object key path

declare const example: {
    foo: {
        bar: {
            a: string;
        };
        baz: {
            b: number
            c: number
        }
    };
}

// Possible solutions: 
// []
// ['foo']
// ['foo', 'bar']
// ['foo', 'bar', 'a']
// ['foo', 'baz']
// ['foo', 'baz', 'b']
// ['foo', 'baz', 'c']

解题思路

待补充

答案

type Path<T> = any

验证

import type { ExpectExtends, ExpectFalse, ExpectTrue } from '@type-challenges/utils'

declare const example: {
  foo: {
    bar: {
      a: string
    }
    baz: {
      b: number
      c: number
    }
  }
}

type cases = [
  ExpectTrue<ExpectExtends<Path<typeof example['foo']['bar']>, ['a']>>,
  ExpectTrue<ExpectExtends<Path<typeof example['foo']['baz']>, ['b'] | ['c'] >>,
  ExpectTrue<ExpectExtends<Path<typeof example['foo']>, ['bar'] | ['baz'] | ['bar', 'a'] | ['baz', 'b'] | ['baz', 'c']>>,
  ExpectFalse<ExpectExtends<Path<typeof example['foo']['bar']>, ['z']>>,
]

参考

无