typescript 用打字稿定义原型函数
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Define prototype function with typescript
提问by Alexandre
When I try to define a prototype function, I get:
当我尝试定义原型函数时，我得到：
error TS2339: Property 'applyParams' does not exist on type 'Function'.
错误 TS2339：属性 'applyParams' 在类型“Function”上不存在。
Function.prototype.applyParams = (params: any) => {
this.apply(this, params);
}
How to solve this error?
如何解决这个错误？
回答by David Sherret
Define the method on an interface named Functionin a .d.tsfile. This will cause it to declaration mergewith the global Functiontype:
Function在.d.ts文件中命名的接口上定义方法。这将导致它与全局类型声明合并Function：
interface Function {
applyParams(params: any): void;
}
And you don't want to use an arrow function so that thiswon't be bound to the outside context. Use a regular function expression:
并且您不想使用箭头函数，这样this就不会绑定到外部上下文。使用正则函数表达式：
Function.prototype.applyParams = function(params: any) {
this.apply(this, params);
};
Now this will work:
现在这将起作用：
const myFunction = function () { console.log(arguments); };
myFunction.applyParams([1, 2, 3]);
function myOtherFunction() {
console.log(arguments);
}
myOtherFunction.applyParams([1, 2, 3]);
