Encountering issue in Angular 14: Unable to assign type 'Date | undefined' to type 'string | number | Date' parameter

I have been working on an Angular 14 project where I am implementing a Search Filter Pipe. Below is the code snippet I am using:

import { Pipe, PipeTransform } from '@angular/core';
@Pipe({
  name: 'transferFilter'
})
export class TransferFilterPipe implements PipeTransform {
  transform(row: any, f1: Date, f2?: Date): any {
    f1.toString().length == 0 ? f1 = new Date("1995-12-25T11:30:00.000Z") : f1;
    f2 == null ? f2 = new Date() :f2;
    if (f1 >= f2 || f1 == null) { return row;}
    return row.filter((x: { fecha: string | number | Date; })=>{return  new Date(x.fecha) >= new Date(f1) && new Date(x.fecha) <= new Date(f2)});
  }
}

However, when testing this code, I encountered the following error message:

No overload matches this call.
  Overload 1 of 4, '(value: string | number | Date): Date', gave the following error.
    Argument of type 'Date | undefined' is not assignable to parameter of type 'string | number | Date'.
      Type 'undefined' is not assignable to type 'string | number | Date'.
  Overload 2 of 4, '(value: string | number): Date', gave the following error.
    Argument of type 'Date | undefined' is not assignable to parameter of type 'string | number'.
      Type 'undefined' is not assignable to type 'string | number'.ts(27

The issue seems to be with f2, highlighted in this part of the code:

new Date(x.fecha) <= new Date(f2)

If anyone has insights on how to resolve this problem, your help would be greatly appreciated!

Thank you.

Answer №1

Problem

The issue arises from the fact that f2 is of type Date | undefined in this code snippet:

transform(row: any, f1: Date, f2?: Date)

The following line only assigns a value to f2 when it is null, but it does not change its type:

f2 == null ? f2 = new Date() : f2;

Resolution

To address this issue, you can explicitly cast f2 to the Date type:

new Date(f2 as Date)

Recommendations

  1. Using a Date instance to parse a Date (new Date(f2 as Date)) seems unnecessary. You can simplify it like so:
return row.filter((x: { fecha: string | number | Date; }) 
  => { return  new Date(x.fecha) >= f1 && new Date(x.fecha) <= (f2 as Date) });
  1. Consider utilizing the nullish-coalescing operator (??):

You can streamline this line:

f2 == null ? f2 = new Date() : f2;

to:

f2 = f2 ?? new Date();

Answer №2

When defining parameters, it is recommended to assign a fallback date directly within the parameter declaration. For example:

transform(row: any, f1: Date, f2 = new Date()): any {...}

Explanation

If you make f2 an optional argument, TypeScript will infer its type as Date | undefined

f2: Date | undefined

The error occurs because the Date constructor expects either a number, string, or another Date as input.

interface DateConstructor {
    new (value: number | string | Date): Date;
}

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