其他
15 种TypeScript最常用的实用程序类型
英文 | https://javascript.plainenglish.io/15-utility-types-that-every-typescript-developer-should-know-6cf121d4047c
/** * Make all properties in T optional. * typescript/lib/lib.es5.d.ts */type Partial<T> = { [P in keyof T]?: T[P];};/** * Make all properties in T required. * typescript/lib/lib.es5.d.ts */type Required<T> = { [P in keyof T]-?: T[P];};/** * Make all properties in T readonly. * typescript/lib/lib.es5.d.ts */type Readonly<T> = { readonly [P in keyof T]: T[P];};/** * Construct a type with a set of properties K of type T. * typescript/lib/lib.es5.d.ts */type Record<K extends keyof any, T> = { [P in K]: T;};/** * Exclude from T those types that are assignable to U. * typescript/lib/lib.es5.d.ts */type Exclude<T, U> = T extends U ? never : T;/** * Extract from T those types that are assignable to U. * typescript/lib/lib.es5.d.ts */type Extract<T, U> = T extends U ? T : never;/** * From T, pick a set of properties whose keys are in the union K. * typescript/lib/lib.es5.d.ts */type Pick<T, K extends keyof T> = { [P in K]: T[P];};/** * Construct a type with the properties of T except for those * in type K. * typescript/lib/lib.es5.d.ts */type Omit<T, K extends keyof any> = Pick<T, Exclude<keyof T, K>>;/** * Exclude null and undefined from T. * typescript/lib/lib.es5.d.ts */type NonNullable<T> = T extends null | undefined ? never : T;/** * Obtain the parameters of a function type in a tuple. * typescript/lib/lib.es5.d.ts */type Parameters<T extends (...args: any) => any> = T extends (...args: infer P) => any ? P : never;/** * Obtain the return type of a function type. * typescript/lib/lib.es5.d.ts */type ReturnType<T extends (...args: any) => any> = T extends (...args: any) => infer R ? R : any;ConstructorParameters<Type>：根据构造函数类型的类型构造元组或数组类型。它产生一个包含所有参数类型的元组类型（如果 Type 不是函数，则类型 never ）。 InstanceType<Type>：构造一个由Type中构造函数的实例类型组成的类型。 ThisParameterType<Type>：为函数类型提取此参数的类型，如果函数类型没有此参数，则为未知。
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