随笔分类 - TypeScript
摘要：Implement a type `Sum<A, B>` that summing two non-negative integers and returns the sum as a string. Numbers can be specified as a string, number, or
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摘要：Implement a type-level integers comparator. We've provided an enum for indicating the comparison result, like this: If a is greater than b, type shoul
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摘要：Implement the JavaScript Array.slice function in the type system. Slice<Arr, Start, End> takes the three argument. The output should be a subarray of
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摘要：It is useful to enable '@typescript-eslint/unbound-method': 'error', because this kind of error is related to this keyword, sometime it is hard to not
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摘要：Create a SnakeCase<T> generic that turns a string formatted in camelCase into a string formatted in snake_case. A few examples: type res1 = SnakeCase<
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摘要：import { Equal, Expect } from "../helpers/type-utils"; type Route = | { route: "/"; search: { page: string; perPage: string; }; } | { route: "/about"
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摘要：import { Equal, Expect } from "../helpers/type-utils"; interface Attributes { id: string; email: string; username: string; } /** * How do we create a
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摘要：Let's say we want to extract query param from string: type UserPath = "/users/:id"; type UserOrganisationPath = "/users/:id/organisations/:organisatio
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摘要：Consider this discriminated union called Fruit: type Fruit = | { name: "apple"; color: "red"; } | { name: "banana"; color: "yellow"; } | { name: "oran
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摘要：We start with a Values interface: interface Values { email: string; firstName: string; lastName: string; } We want a union of tuple [key, value]as res
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摘要：We have a type Route that is a discriminated union of the possible routes in the application. Each route has the properties search and route type Rout
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摘要：Let's say we have: type Fruit = "apple" | "banana" | "orange"; We only want AppleOrBanana If we do as such: type Fruit = "apple" | "banana" | "orange"
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摘要：Let's imagine you're building a type helper to extract out the value from several different 'parsers'. const parser1 = { parse: () => 1, }; const pars
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摘要：Example 1 import { S } from "ts-toolbelt"; import { Equal, Expect } from "../helpers/type-utils"; type Names = [ "Matt Pocock", "Jimi Hendrix", "Eric
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摘要：In this exercise we have an interface MyComplexInterface which is acting as a type helper. The interface takes arguments for Event, Context, Name, and
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摘要：import { Equal, Expect } from "../helpers/type-utils"; type GetPropValue< T extends Record<PropertyKey, any>, P extends keyof T = "data" > = T extends
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摘要：type NonEmptyArray<T> = [T, ...Array<T>]; export const makeEnum = (values: NonEmptyArray<string>) => {}; makeEnum(["a"]); makeEnum(["a", "b", "c"]); /
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摘要：export type Maybe<T extends {}> = T | null | undefined; type tests = [ // @ts-expect-error Maybe<null>, // @ts-expect-error Maybe<undefined>, Maybe<st
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摘要：import { Equal, Expect } from "../helpers/type-utils"; type Maybe<T> = T | null | undefined; type tests = [ Expect<Equal<Maybe<string>, string | null
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摘要：import { Equal, Expect } from "../helpers/type-utils"; type Identity<T> = T; type tests = [ Expect<Equal<Identity<1>, 1>>, Expect<Equal<Identity<"1">,
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