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You can use `extends infer X` to assign the result of an expression to a variable type SomeFunction<U> = SuperHeavyComputation<U> extends infer Result 阅读全文
posted @ 2022-11-17 15:11
Zhentiw
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The enum is an original syntax of TypeScript (it does not exist in JavaScript). So it is converted to like the following form as a result of transpila 阅读全文
posted @ 2022-11-16 22:35
Zhentiw
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Similar to Array.findIndex: type FindIndex<T extends readonly any[], K, ACC extends unknown[] = []> = T extends readonly [infer F, ...infer RT] ? K ex 阅读全文
posted @ 2022-11-16 22:34
Zhentiw
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type OnPropChangedMethods<T> = { [Key in keyof T & string as `${Key}Changed`]: (cb: (newValue: T[Key]) => void) => void } declare function makeWatched 阅读全文
posted @ 2022-11-16 15:02
Zhentiw
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type Placeholder<T extends string> = T extends `${string}{${infer P}}${infer REST}` ? P | Placeholder<REST> : never; declare function format<S extends 阅读全文
posted @ 2022-11-16 14:48
Zhentiw
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Implement a type FilterOut<T, F> that filters out items of the given type F from the tuple T. For example, type Filtered = FilterOut<[1, 2, null, 3], 阅读全文
posted @ 2022-11-16 02:19
Zhentiw
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Convert a string literal to a number, which behaves like Number.parseInt. /* _____________ Your Code Here _____________ */ type ToNumber<S extends str 阅读全文
posted @ 2022-11-15 00:43
Zhentiw
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The get function in lodash is a quite convenient helper for accessing nested values in JavaScript. However, when we come to TypeScript, using function 阅读全文
posted @ 2022-11-15 00:34
Zhentiw
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Sometimes it's useful to detect if you have a value with any type. This is especially helpful while working with third-party Typescript modules, which 阅读全文
posted @ 2022-11-14 01:01
Zhentiw
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Implement CamelCase<T> which converts snake_case string to camelCase. For example type camelCase1 = CamelCase<'hello_world_with_types'> // expected to 阅读全文
posted @ 2022-11-12 17:28
Zhentiw
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