[英]Typescript split string and validate type
Let's say i have a string value of ReplaceText::some.other.property
, I'd like to split this value by the delimeter of ::
and validate the types of each input假设我有一个
ReplaceText::some.other.property
的字符串值,我想用::
的分隔符拆分这个值并验证每个输入的类型
type Action = 'ReplaceText' | 'ReplaceImage';
type Split<S extends string, D extends string> =
string extends S ? Action[] :
S extends '' ? [] :
S extends `${infer T}${D}${infer U}` ? [T, ...Split<U, D>] : [S];
declare function translate<P extends string>(path: P): Split<P, '::'>;
const [action, dotString] = translate('ReplaceText::some.other.property');
This returns the values, but action is not of type of Action
, I'm not quite sure where to begin here!这将返回值,但 action 不是
Action
类型,我不太确定从哪里开始!
eg, if i did:例如,如果我这样做了:
const [action, dotString] = translate('ActionThatDoesNotExist::some.other.property');
// id expect validation errors because this action does not exist!
You just need to use a string literal type like:您只需要使用字符串文字类型,例如:
type Action = 'ReplaceText' | 'ReplaceImage';
type ActionWithPath = `${Action}::${string}`
Now ActionWithPath
is any string that starts with an Action
, followed by ::
and then any string.现在
ActionWithPath
是以Action
开头的任何字符串,后跟::
,然后是任何字符串。
Then just use that type as your constraint:然后只需使用该类型作为约束:
declare function translate<P extends ActionWithPath>(path: P): Split<P, '::'>;
And the rest works like you expect:其余的就像您期望的那样工作:
translate('ReplaceText::some.other.property'); // fine
translate('ActionThatDoesNotExist::some.other.property'); // error
Note: deriving a dotted object path is much trickier and out of scope of this question, but you can start here: Typescript: deep keyof of a nested object注意:导出带点的对象路径要复杂得多,超出了这个问题的范围,但你可以从这里开始: Typescript: deep keyof of a nested object
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