如何爲包含特定功能數組的JSON對象編寫接口

Question

我想爲JSON對象創建一個接口。它有n具有未知名稱的鍵，每個值都是具有特定簽名的函數數組。

// CLASSES 
class Server { 

    // Private variables 
    mapping : IMapping = {} 

    // Public functions 
    public use(endPoint = "", handler : IHandler) : void { 

     // Check if the end point exists in the mapping 
     if(this.mapping[endPoint] === undefined) { 

      this.mapping[endPoint] = { 
       [endPoint] : [handler] 
      }; 

     } else { 

     } 
    } 

} 

// INTERFACES 
interface IMapping 
{ 
    [key : string] : IHandler[]; 
} 

interface IHandler { 
    (req : object, res : object, next : object) : void; 
} 

我的代碼失敗的：this.mapping[endPoint]與

Type '{ [x: string]: IHandler[]; }' is not assignable to type 'IHandler[]'. 
Property 'length' is missing in type '{ [x: string]: IHandler[]; }'. 

Answer 1

應該僅僅是：

this.mapping[endPoint] = [handler];