type 继承

    type TypeA = {
    name: string;
    };

    type TypeB = {
    age: number;
    country: string;
    };

    type TypeC = TypeA & TypeB;

    const example: TypeC = {
    name: 'Tom',
    age: 30,
    country: 'Chile',
    };

interface 继承

    type TypeA = {
    name: string;
    age: number;
    };

    interface InterfaceA {
    country: string;
    }

    type TypeB = TypeA & InterfaceA;

    const example: TypeB = {
    name: 'Tom',
    age: 30,
    country: 'Chile',
    };

interface extends 继承

    type TypeA = {
    name: string;
    country: string;
    };

    interface InterfaceA extends TypeA {
    age: number;
    }

    const example: InterfaceA = {
    name: 'Tom',
    age: 30,
    country: 'Chile',
    };

interface extends 继承多个

    type TypeA = {
    name: string;
    };

    type TypeB = {
    country: string;
    };

    interface InterfaceA extends TypeA, TypeB {
    age: number;
    }

    const example: InterfaceA = {
    name: 'Tom',
    age: 30,
    country: 'Chile',
    };

参考

• How to extend a Type in TypeScript