您可以为此使用联合类型

type A = string
type X = string[]

type B = number
type Y = number[]

type MyInterface = { a: A, x: X } | { a: B, x: Y }

const test1: MyInterface = { a: 'foo', x: ['bar', 'foobar'] } // pass
const test2: MyInterface = { a: 0, x: [1, 2] } // pass
const test3: MyInterface = { a: 0, x: ['', ''] } // error
const test4: MyInterface = { a: '', x: [1, 2] } // error

Playground

类型将允许MyInterface（MyType）成为Union类型。

type AX = {
  a: A;
  x: X;
};
type BY = {
  b: B;
  y: Y;
};

type MyType = AX | BY;

const value: MyType = {
  a: "a",
  x: "x",
};