type Value1 = { name: string; }; 因为type alias 不能像 interface 那样可以重复声明,所以 type alias 会被 infer an implicit index signature: //当我们这样: test = value_1; //Value1 其实被 infer 成这样了: type Value1 = { name: string; [key: string]: string; }; //所以 Test 和 ...
问Typescript错误:在类型'{}‘上找不到参数类型为'string’的索引签名EN如上的代码在编译器当中是会...
Element implicitly has an 'any' type because expression of type 'string' can't be used to index type '{ train_1: boolean; train_2: boolean; train_3: boolean; train_4: boolean; }'. No index signature with a parameter of type 'string' was found on type '{ train_1: boolean; train...
当我们尝试访问global对象上不存在的属性时,会出现错误“Element implicitly has an 'any' type because type 'typeof globalThis' has no index signature”。 要解决此错误,需要扩展全局对象并为必要的属性指定类型。 下面代码是一个发生该错误的示例。 // Error: Element implicitly has an 'any' // type bec...
问TypeScript:当尝试访问Enum时，没有带有“string”类型参数的索引签名EN本章节要介绍的内容为 TS 接口...
1.在ts中,碰到Element implicitly has an 'any' type because expression of type 'string' can't be used to index type 'Object'. No index signature with a parameter of type 'string' was found on type 'Object'. 这种问题测出现时说:元素隐式具有“any”类型,因为“string”类型的表达式不能用于索...
"hello" : [0]); // No overload matches this call. // Overload 1 of 2, '(s: string): number', gave the following error. // Argument of type 'number[] | "hello"' is not assignable to parameter of type 'string'. // Type 'number[]' is not assignable to type 'string'. /...
我总是用标志 --noImplicitAny 编译TypeScript。这是有道理的,因为我希望我的类型检查尽可能严格。 我的问题是使用以下代码出现错误: Index signature of object type implicitly has an 'any' type interface ISomeObject { firstKey: string; secondKey: string; thirdKey: string; } let someObject: ISome...
一、noUnusedLocals 将这个选项设置为 true 时,编译器将检查未使用的局部变量并生成错误,其方式类似于 ESLint 中的 no-unused-vars。此编译器选项旨在消除和删除 Typescript 中未使用的变量。考虑下面的例子: <pre class="prettyprint hljs verilog" style="padding: 0.5em; font-family: Menlo, Monaco, Consol...
// Error! Property 'prop' of type 'boolean' // is not assignable to string index type // 'string | number | undefined'. static [propName: string]: string | number | undefined; } 1. 2. 3. 4. 5. 6. 7. 8. 9. import 语句补全 ...