accountType ="user";// 报错:roperty 'email' has no initializer and is not definitely assigned in the constructor.// 属性“email”没有初始化表达式,且未在构造函数中明确赋值。email:string;address:string|undefined;constructor(name:st
typescript interface 三点运算符 object is not iterable es6中三点运算符有两种用法 1.作为参数使用 当定义函数对象时,参数的个数不确定,可以用三点运算符设置一个动态参数。 例: 1 var fun = function(a,...list){//a为普通参数,...list为剩余参数 2 console.log(a,list) 3 } 4 fun('0','a',...
AI代码解释 constTRUE:true=false;// Error: Type 'false' is not assignable to type 'true'constFALSE:false=true;// Error: Type 'true' is not assignable to type 'false' 随着boolean 字面类型的引入,预定义的 boolean 类型现在等价于true | false的联合类型: 代码语言:javascript 代码运行次数:0 运行...
p.age,p.friend);// 结果:tom 18 { name: 'jerry' }// p.friend = {name:'lisi'}; // 报错: cannot assign to 'friend' because it is a read-only property.if(p.friend) {
Type 'undefined' is not assignable to type 'number'. 7 ataolaFI = function (arr: number[], num: number) { ~~~ Found 1 error. 这里的话少考虑一种情况就是,要是找不到呢?后面改正的代码是 代码语言:javascript 代码运行次数:0 运行 AI代码解释 //一个基于Typescript,数字数组索引查找的实现 int...
, string> = new WeakMap(); console.log(weakMap); let obj = {}; weakMap.set(obj, "hello"); console.log(weakMap); // Attempt to iterate // Throws an error for (let item of weakMap) { console.log(item); } Run Code This will throw a TypeError because WeakMap is not iterable...
I get TypeError: node.params is not iterable with eslint command using yarn v2 (berry). Repro yarn init -y yarn set version berry yarn add react yarn add -D @babel/core @babel/eslint-parser @babel/preset-env @babel/preset-react @babel/pr...
">error TS2375: Type '{ property: undefined; }' is not assignable to type 'Test' with 'exactOptionalPropertyTypes: true'. Consider adding 'undefined' to the types of the target's properties. Types of property 'property' are incompatible. Type 'undefined' is not assignable to type 'string...
error TS2345: Argument of type 'Buffer' is not assignable to parameter of type 'string | ArrayBufferView | Stream | Iterable<string | ArrayBufferView> | AsyncIterable<string | ArrayBufferView>'. then you may need to update @types/node. You can read the specifics about this change on ...
Earlier we mentioned that TypeScript has types forIterableandIterator; however, like we mentioned, these act sort of like "protocols" to ensure certain operations work.That means that not every value that is declaredIterableorIteratorin TypeScript will have those methods we mentioned above. ...