All files / src/validators helpers.ts

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import { Validator } from '..';
import { Grammar } from '../utils/grammar';
 
/**
 * A helper validator to coerce strings to numbers before running a subsequent validator
 * @param validator the number validator to execute
 * @returns the reason for the number validator failing
 */
export function coerceNumber(
  validator: Validator.Fn<number | null | undefined>
): Validator.Fn<string | number | null | undefined> {
  return (value: string | number | null | undefined): string | void => {
    return validator(typeof value === 'string' ? Number(value) : value);
  };
}
 
export function or<T>(...validators: Validator.Fn<T>[]): Validator.Fn<T> {
  return (value: T): string | void => {
    const errors: string[] = [];
 
    for (const validator of validators) {
      const response = validator(value);
 
      if (!response) return;
 
      errors.push(response);
    }
 
    return Grammar.and(...errors);
  };
}