Issue with interface result: does not match type

Hey there! I've been working on creating an interface in TypeScript to achieve the desired return as shown below:

  {
    "field": "departament_name",
    "errors": [
      "constraint": "O nome do departamento precisa ser do tipo String",
    ]   },

Unfortunately, I'm facing an issue when trying to add the object to my array, resulting in the following error message:

Type 'string []' is not assignable to type 'constraints []'. Type 'string' is not assignable to type 'constraints'.ts (2322)

This is how my interfaces and function are structured:

export interface constraints {
  constraint: string
}
export interface errorFormater {
  field: string;
  errors: constraints[]
}

And here's the function:

export const formatErrors = (validationErrors: ValidationError[]): errorFormater[] => {
  let response: errorFormater[] = [];
  for (let error of validationErrors) {
    let field: string = error.property;
    let constraints: string[] = [];
    for (let constraint in error.constraints) {
      if (!error.constraints.hasOwnProperty(constraint)) {
        continue;
      }
      constraints.push(error.constraints[constraint]);
    };
    // console.log(property, errorMessage)
    response.push({ field, errors: constraints });
  }

  return response;
}

Answer №1

The issue arises from the mismatch between the ValidationError.constraints type and the Constraint type. If you have created your own ValidationError type, you will need to ensure that it aligns with the Constraint type like so:

export interface IConstraint {
  constraint: string;
}
export interface IErrorFormatter {
  field: string;
  errors: IConstraint[];
}
export interface IValidationError {
  constraints: IConstraint[];
}

Alternatively, you could resort to a type cast (although this is not recommended)

Answer №2

Consider updating the data type of your constraints variable as follows:

let constraints: constraints[] = [];

Additionally, modify the response being pushed to the constraints array like this:

constraints.push({ constraint: error.constraints[constraint] });

By making these changes, you should achieve the desired outcome.

Best regards,

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