如何在Type脚本中创建UUID模板文字类型? [英] How to create a UUID template literal type in Typescript?
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问题描述
是否有人成功地使用新的模板文本类型在TypeScrip中为UUID编写了类型?
例如:
const id:UUID = "f172b0f1-ea0a-4116-a12c-fc339cb451b6"
此人尝试:UUID Tweet
但类型太复杂:";表达式生成的联合类型太复杂,无法表示。(2590):Example
他的类型:
type Alphabetic = 'a' | 'b' | 'c' | 'd' | 'e' | 'f' | 'g' | 'h' | 'i' | 'j' | 'k' | 'l' | 'm' | 'n' | 'o' | 'p' | 'q' | 'r' | 's' | 't' | 'u' | 'v' | 'w' | 'x' | 'y' | 'z'
type Alphanumeric = Alphabetic | Numeric
type Repeat<
Char extends string,
Count extends number,
Joined extends string = ``,
Acc extends 0[] = []
> = Acc['length'] extends Count ? Joined : Repeat<Char, Count, `${Joined}${Char}`, [0,...Acc]>
type UUIDV4 = `${Repeat<Alphanumeric, 8>}-${Repeat<Alphanumeric, 4>}-${Repeat<Alphanumeric, 4>}-${Repeat<Alphanumeric, 4>}-${Repeat<Alphanumeric, 12>}````
推荐答案
我不确定这是否可能,因为TS有他自己的限制。 考虑这个例子:
type Alphabetic = 'a' | 'b' | 'c' | 'd' | 'e' | 'f' | 'g' | 'h' | 'i' | 'j' | 'k' | 'l' | 'm' | 'n' | 'o' | 'p' | 'q' | 'r' | 's' | 't' | 'u' | 'v' | 'w' | 'x' | 'y' | 'z'
type Numeric = 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0
type StringNumber<T extends number> = `${T}`
type Alphanumeric = Alphabetic | StringNumber<Numeric>
type Result<T extends string> = T extends any ? T : never;
interface Unit {
value: Alphanumeric
}
type Check = `${Alphanumeric}${Alphanumeric}${Alphanumeric}`
Check
生成超过46.6K的可能状态。
如果您添加另一个${Alphanumeric}
,它将达到限制。
我怀疑它是否可以在打字系统中表示。
可能在Tail recursive evaluation of conditional types之后
我以为只验证字符串是否有效是可能的,就像我对十六进制表示法here所做的那样,但它似乎也不起作用。
您仍然可以验证已知的UUID文本:
type Alphabetic = 'a' | 'b' | 'c' | 'd' | 'e' | 'f' | 'g' | 'h' | 'i' | 'j' | 'k' | 'l' | 'm' | 'n' | 'o' | 'p' | 'q' | 'r' | 's' | 't' | 'u' | 'v' | 'w' | 'x' | 'y' | 'z'
type Numeric = 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0
type StringNumber<T extends number> = `${T}`
type Alphanumeric = Alphabetic | StringNumber<Numeric>
type Separator = '-'
type UUID = 'f172b0f1-ea0a-4116-a12c-fc339cb451b6'
type Template = [8, 4, 4, 4, 12];
type IsValid<T, Cache extends string[] = []> =
T extends string ?
T extends ''
? Cache
: T extends `${infer Char}${infer Rest}`
? Char extends Alphanumeric ? IsValid<Rest, [...Cache, Char]>
: never
: never
: never
type Split<S extends string, D extends string> =
string extends S ? string[] :
S extends '' ? [] :
S extends `${infer T}${D}${infer U}` ? [T, ...Split<U, D>] : [S];
type StringLength<T, Cache extends any[] = []> =
T extends string ?
T extends ''
? Cache['length']
: T extends `${infer Char}${infer Rest}`
? StringLength<Rest, [...Cache, Char]>
: never
: never
type Every<T extends any[], Cache extends any[] = []> =
T extends []
? Cache
: T extends [infer Head, ...infer Rest]
? Every<Rest, [...Cache, IsValid<Head>['length']]>
: never
type IsCorrect<T extends string,> = Every<Split<T, Separator>> extends Template ? true : false
type Test = IsCorrect<'f172b0f1-ea0a-4116-a12c-fc339cb451b6'> // ok
type Test2 = IsCorrect<'f172b0f1-ea0a-4116-a12c'> // false
type Test3 = IsCorrect<'f172b0f1-ea0a-4116-a12c-fc339cb451b6--'> // false
type Test4 = IsCorrect<'f172b0f1-ea0a-4116-a12c-fc339cb451b'> // false
type Test5 = IsCorrect<'f172b0f1-ea0a-4116-a%%c-fc339cb451b'> // false
type Test6 = IsCorrect<'f172b0f1ea0a-4116-a12c-fc339cb451b6'> // false
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