How to use the availity-reactstrap-validation.AvValidator.number function in availity-reactstrap-validation

import {AvValidator} from 'availity-reactstrap-validation';

const fn = AvValidator.number;

describe('Number Validation', () => {
  it('should not require a value', () => {
    expect(fn('')).to.be.true;
  });

  it('should return custom error message if provided when field is not valid', () => {
    expect(fn('a4', undefined, {errorMessage: 'NaN!'})).to.equal('NaN!');
  });

  it('should accept numbers', () => {
    expect(fn(0)).to.be.true;
    expect(fn(-1)).to.be.true;
    expect(fn(1)).to.be.true;
    expect(fn(10)).to.be.true;
  });