All files / src/app/shared/validators number.validator.ts

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import { AbstractControl, ValidationErrors, ValidatorFn } from "@angular/forms";
 
export function positiveNumberValidator (): ValidatorFn {
    return (control: AbstractControl): ValidationErrors | null => {
        const value = control.value;
        if (!value || value > 0)
            return null;
        return { positive: true };
    };
}