生成强类型函数时，节点 api 服务上出现意外标记“：”

Question

I have a node api service written in typescript, below is my sample code

class dataStreamConfig {
    constructor() { }

    conclaveObj = (firstParam: string, secondParam: number, thirdParam: any): any => {
        //my business logic goes here
       //return Obj

    };
}

module.exports = dataStreamConfig ;

Im getting the below error

SyntaxError: Unexpected token ':'
    at Module._compile (internal/modules/cjs/loader.js:891:18)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:991:10)

If i remove the types (string, number, any) from the function, then it is working fine. I have tried to redo npm install.

Also i did npm install babel-cli babel-preset-es2015.

Update

Below is my tsconfig.json

{
    "compilerOptions": {
      "target": "es5",
      "module": "commonjs",
      "sourceMap": true
    }
  }

Also i have typescript installed globally. I compile the project using tsc command at the root, also i have tried running tsc on the directory which has the class.

Would really appreciate any help / suggestion in this issue.

Answer 1

try getting rid of the arrow function and using the normal way of writing a function with the function keyword .. Do note the last any in this function denotes the type this function will return and this is optional. typescript can also detect this itself. so it doesn't matter if you provide it or not...

class dataStreamConfig {
constructor() { }

   let conclaveObj = function (firstParam: string, secondParam: number, thirdParam: any): any {
    //my business logic goes here
   //return Obj

};

}

module.exports = dataStreamConfig ;

for more help you can visit thier documentation ... https://www.typescriptlang.org/docs/handbook/functions.html