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Implement the advanced util type GetRequired<T>, which remains all the required fields For example type I = GetRequired<{ foo: number, bar?: string }> 阅读全文
posted @ 2022-11-10 21:57
Zhentiw
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type PathParams<S extends string> = S extends `/${string}/:${infer Param}/${infer REST}` ? Param | PathParams<`/${REST}`> : S extends `${string}/:${in 阅读全文
posted @ 2022-11-09 22:28
Zhentiw
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Implement the advanced util type UnionToIntersection<U> For example type I = Union2Intersection<'foo' | 42 | true> // expected to be 'foo' & 42 & true 阅读全文
posted @ 2022-11-09 17:22
Zhentiw
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Co-Variance: declare let b: string declare let c: string | number c = b // ✅ // string is a sub-type of string | number // all elements of string appe 阅读全文
posted @ 2022-11-09 17:18
Zhentiw
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So what is a nake type? Example: type UnionToIntersection<T> = (T extends any ? (x: T) => any : never) //... We check Tin a sub-type condition, T exte 阅读全文
posted @ 2022-11-09 02:47
Zhentiw
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Implement Replace<S, From, To> which replace the string From with To once in the given string S For example type replaced = Replace<'types are fun!', 阅读全文
posted @ 2022-11-08 14:45
Zhentiw
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TypeScript 4.0 is recommended in this challenge Currying is the technique of converting a function that takes multiple arguments into a sequence of fu 阅读全文
posted @ 2022-11-08 02:57
Zhentiw
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Implement a simpiled version of a Vue-like typing support. By providing a function name SimpleVue (similar to Vue.extend or defineComponent), it shoul 阅读全文
posted @ 2022-11-08 02:43
Zhentiw
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This utility does not return a transformed type. Instead, it serves as a marker for a contextual this type. Note that the noImplicitThis flag must be 阅读全文
posted @ 2022-11-08 02:34
Zhentiw
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We have the following code which has compile error: async function readData(event?: Event | unknown): Promise<void> { // ... let text: string | undefi 阅读全文
posted @ 2022-11-04 16:00
Zhentiw
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