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Trim Right

介绍​

实现 TrimRight<T> ，它接收确定的字符串类型并返回一个新的字符串，其中新返回的字符串删除了原字符串结尾的空白字符串。

ts
type Trimed = TrimRight<'  Hello World  '> // 应推导出 '  Hello World'
ts
type Trimed = TrimRight<'  Hello World  '> // 应推导出 '  Hello World'
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起点​

ts
/* _____________ Your Code Here _____________ */
 
type TrimRight<S extends string> = any
 
/* _____________ Test Cases _____________ */
 
type cases = [
  Expect<Equal<TrimRight<'str'>, 'str'>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<'str '>, 'str'>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<'str     '>, 'str'>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<'     str     '>, '     str'>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<'   foo bar  \n\t '>, '   foo bar'>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<''>, ''>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<'\n\t '>, ''>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
]
ts
/* _____________ Your Code Here _____________ */
 
type TrimRight<S extends string> = any
 
/* _____________ Test Cases _____________ */
 
type cases = [
  Expect<Equal<TrimRight<'str'>, 'str'>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<'str '>, 'str'>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<'str     '>, 'str'>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<'     str     '>, '     str'>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<'   foo bar  \n\t '>, '   foo bar'>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<''>, ''>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
  Expect<Equal<TrimRight<'\n\t '>, ''>>,
Type 'false' does not satisfy the constraint 'true'.2344Type 'false' does not satisfy the constraint 'true'.
]
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解决方案​

Spoiler warning // Click to reveal answer
ts
type TrimRight<S extends string> =  S extends `${infer F}${' '|'\n'|'\t'}` ? TrimRight<F> : S;
 
ts
type TrimRight<S extends string> =  S extends `${infer F}${' '|'\n'|'\t'}` ? TrimRight<F> : S;
 
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