Angular custom validations

angular-custom-validations.ts

import { AbstractControl, FormGroup, ValidationErrors, ValidatorFn } from '@angular/forms';

export class CustomValidators {
  static age(control: AbstractControl) {
    const value = control.value;
    if (value < 18) {
      return { isYoung: true };
    }
    return null;
  }

  static ageWithParam(max: number) {
    return (control: AbstractControl) => {
      const value = control.value;
      if (value < max) {
        return { isYoung: true };
      }
      return null;
    };
  }

  static validateActualDate(
    control: AbstractControl
  ): { [key: string]: boolean } | null {
    const currentDate = new Date();

    const value = control.value;
    let valueToDate = new Date();
    if (value) {
      valueToDate = new Date(value);

      if (valueToDate > currentDate) {
        return { dateInvalid: true };
      }
    }

    return null;
  }

  atLeastOneTimeLimitValidator: ValidatorFn = (
    formGroup: FormGroup
  ): ValidationErrors | null => {
    const minTimeLimitControl = formGroup.get('minTimeLimit');
    const maxTimeLimitControl = formGroup.get('maxTimeLimit');

    const objValidator = { minTimeLimitControl, maxTimeLimitControl };

    let theOne = Object.keys(objValidator).findIndex(
      (key) => objValidator[key].value !== ''
    );
    if (theOne === -1) {
      console.log(theOne);
      return { atLeastOneTimeLimitValidator: true }; // This is our error!
    } else {
      return null;
    }
  };

  static dateMinMaxValidator(control: AbstractControl) {
    const value = control.value;

    if (!value) {
      return null;
    }

    const year = new Date();
    const actualYear = new Date(year).getFullYear();
    const valueYear = new Date(value).getFullYear();
    const validMaxYear = Number(actualYear) + 100;
    const validMinYear = Number(actualYear) - 100;

    if (valueYear > validMaxYear) {
      return {
        dateMinMax: true,
      };
    }
    if (valueYear < validMinYear) {
      return {
        dateMinMax: true,
      };
    }
    return null;
  }
}