题目
中文
实现一个接收string,number或bigInt类型参数的Absolute类型,返回一个正数字符串。
例如
type Test = -100;
type Result = Absolute<Test>; // expected to be "100"
English
Implement the Absolute type. A type that take string, number or bigint. The output should be a positive number string
For example
type Test = -100;
type Result = Absolute<Test>; // expected to be "100"
答案
type Absolute<T extends number | string | bigint> = T extends `${'+' | '-'}${infer R}`
? R
: (T extends string ? T : Absolute<`${T}`>);