[type-chanlleges] Trim
Question
Implement Trim<T> which takes an exact string type and returns a new string with the whitespace from both ends removed.
For example
type trimed = Trim<' Hello World '> // expected to be 'Hello World'
解：
type Space = ' ' | '\n' | '\t';
type TrimeLeft<T extends string> = T extends `${Space}${infer R}` ? TrimeLeft<R> : T
type TrimRight<S extends string> = S extends `${infer R}${Space}` ? TrimRight<R> : S
type Trim<S extends string> = TrimeLeft<TrimRight<S>>
T 是字符串，可以用模板字符串的语法，本题是 Trim 所以将左侧和右侧分别用可以出现的空白字符串替换，后面的使用infer 推断， 递归调用直到没有空白字符串结束。