ts不错的学习文档

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tsconfig配置

实现pick

挑战
从对象中选出指定对象key的类型

type MyPick<T, K extends keyof T> = {[key in K]:T[key]
}

实现只读

挑战

type MyReadonly<T> = {readonly [key in keyof T]:T[key]
}

返回函数类型

type MyReturnType<T extends Function> =T extends (...args: any) => infer R? R: never

omit去除指定键类型

interface Todo {title: stringdescription: stringcompleted: boolean}type TodoPreview = MyOmit<Todo, 'description' | 'title'>const todo: TodoPreview = {completed: false,}
type MyOmit<T,K extends keyof T> = {[P in keyof T as P extends K ? never: P] :T[P]}