1. 解释“type 'unknown' is not assignable to type”这个错误的含义 在TypeScript中,错误“type 'unknown' is not assignable to type”表明你试图将一个类型为unknown的值赋给一个具有更具体类型的变量。unknown类型是一个顶级类型,它表示一个值的类型未知。TypeScript不允许将unknown类型的值直接赋值给除any或...
如果不是 string 给个默认值,比如 document.title = typeof(to.meta.title) === "string" ? to.meta.title : ""; 也可以定义一个断言函数来用 function isString(value: unknown): value is string { return typeof value === "string"; } document.title = isString(to.meta.title) ? to.meta.t...
相似问题property filter does not exit on type 1026 6 5 Type 'unknown' is not assignable to type 'AnyAction 584 0 2 老师好 关于React.FC<BaseButtonProps> 1587 0 3 老师这里似乎有个口误 1737 0 1 mount: unknown filesystem type 'vboxsf' 1142 0 5 登录后可查看更多问答,...
试试把interface中producatList定义的类型从any[]改为any。 但不应该出现你所说的错误,可以告诉我你使用的typescript版本吗?具体版本可以在package.json文件的dependencies中找到,课程使用的是 "typescript": "^4.1.3", 2 回复 收起回答 提问者 慕虎3545857 #1 老师 改回any后报错消失了。谢谢老师解答,我的...
Type'Object<Task, never>'is not assignable totype'Object<unknown, never>'. Types of property'addListener'are incompatible. Type'(callback: ObjectChangeCallback<Task>) => void'is not assignable totype'(callback: ObjectChangeCallback<unknown>) => void'. ...
let v1: void = null; // Type 'null' is not assignable to type 'void'. let notSure: unknown = 'unknown'; let a: any = 18; let n: null = null; let u: undefined = undefined; a = n; // 没毛病 a = u; // 没毛病
Redux set never as type instead of unknown: The types of 'router.location.state' are incompatible between these types. Type 'unknown' is not assignable to type 'never'. Steps to Reproduce import{connectRouter,LocationChangeAction,RouterState}from'connected-react-router';import{History}from'history...
leta:unknown;//🚨Type 'unknown' is not assignable to type 'number'.ts(2322)constb:number=a; 或者在条件语句中,已经可以明确推断出类型: leta:unknown;letb:number=<number>a; functionisNumber(val:any):valisnumber{ returntypeofval==="number"; ...
Arkts是强类型语言，UserDate类型的数据需要显示转成string类型，才能在JSON.parse中使用。
Type ‘unknown’ is not assignable to type ‘AnyAction’. 55 | 56 | export const useAuth = () => {57 | const dispatch: (…args: unknown[]) => Promise = useDispatch() | ^^^ 58 | const user = useSelector(selectUser) 59 | const...