Attempting to declare a Typescript function with the 'any' type will result in encountering the 'No ideal common type' error regardless

Question

Attempting to declare a Typescript function with the 'any' type will result in encountering the 'No ideal common type' error regardless

I am struggling with a recurring "No best common type" error, even though I have assigned the function a 'any' type. I have also experimented with combinations of types like 'any|string', 'string|any'. . . Any help would be greatly appreciated.

export class TestClass {
  gotCode: any;

  constructor() {

     this.gotCode = function(){
        var codes = Lodash.compact(Lodash.map(Parse.User.current().get("blah"), function(n){
           if(moment().isBefore(n.endDate) && moment().isAfter(n.startDate)){
              return n;
           }
        }));

        if (codes.length > 0){
           return {endDate: Lodash.first(codes).endDate, codeId: Lodash.first(codes).objectId, consumerMatchingCardCash: Lodash.first(codes).consumerMatchingCardCash, codeName: Lodash.first(codes).codeName, consumerPercentIncreaseOnCashBack: Lodash.first(codes).consumerPercentIncreaseOnCashBack};
        } else{
           return "No Codes";
        }
     }();
  }
}

After reviewing the following pages: Type inference with union types - No best common type exists

Angular2: No best common type exists among return expressions

No best common type exists among return expressions

angular typescript

Answer 1

Answer №1

To simplify the code, you can define the method directly within the class. Additionally, in order to bypass the 'no best common type' error, set the return type of the function to 'any'.

  export class TestClass {
    constructor() {
    }

    gotCode(): any {
      let codes = Lodash.compact(Lodash.map(Parse.User.current().get('blah'), function (n) {
        if (moment().isBefore(n.endDate) && moment().isAfter(n.startDate)) {
          return n;
        }
      }));

      if (codes.length > 0) {
        return {
          endDate: Lodash.first(codes).endDate,
          codeId: Lodash.first(codes).objectId,
          consumerMatchingCardCash: Lodash.first(codes).consumerMatchingCardCash,
          codeName: Lodash.first(codes).codeName,
          consumerPercentIncreaseOnCashBack: Lodash.first(codes).consumerPercentIncreaseOnCashBack
        };
      } else {
        return 'No Codes';
      }
    }
  }

Answer 2

To simplify the code, you can define the method directly within the class. Additionally, in order to bypass the 'no best common type' error, set the return type of the function to 'any'.

  export class TestClass {
    constructor() {
    }

    gotCode(): any {
      let codes = Lodash.compact(Lodash.map(Parse.User.current().get('blah'), function (n) {
        if (moment().isBefore(n.endDate) && moment().isAfter(n.startDate)) {
          return n;
        }
      }));

      if (codes.length > 0) {
        return {
          endDate: Lodash.first(codes).endDate,
          codeId: Lodash.first(codes).objectId,
          consumerMatchingCardCash: Lodash.first(codes).consumerMatchingCardCash,
          codeName: Lodash.first(codes).codeName,
          consumerPercentIncreaseOnCashBack: Lodash.first(codes).consumerPercentIncreaseOnCashBack
        };
      } else {
        return 'No Codes';
      }
    }
  }

Answer 3

Answer №2

My knowledge of Typescript is not extensive enough to pinpoint the reason for the error (I'm unsure if any in Typescript serves as the universal type like object does in C# or Java). To resolve the error, consider specifying a return type for your function:

export class TestClass {
    gotCode: any;

    constructor() {
        this.gotCode = function():any { // <- Specify the return type here
            /* Your code here... */
        }();
    }
}

Answer 4

My knowledge of Typescript is not extensive enough to pinpoint the reason for the error (I'm unsure if any in Typescript serves as the universal type like object does in C# or Java). To resolve the error, consider specifying a return type for your function:

export class TestClass {
    gotCode: any;

    constructor() {
        this.gotCode = function():any { // <- Specify the return type here
            /* Your code here... */
        }();
    }
}

Attempting to declare a Typescript function with the 'any' type will result in encountering the 'No ideal common type' error regardless

Answer №1

Answer №2

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