how do I figure out which validator to give an error in form-control

In a component with an input, I pass an array of such objects for validation:

export class ValidatorItem {
validator: ValidatorFn;
errorText: string;
}


in component:

ngOnChanges(changes: SimpleChanges): void {
if ('validators' in changes) {
this.formModel = this.formBuilder.group({
value: ['', Validators.compose(this.validators.map(v => v.validator))],
});
}
}


that is, I need to get an errorText message depending on which validator fell. How can i do this?

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