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tried with cy.then like this, and same error.. 
``` Then('I set {string} field {string} to {string}', (page: string, locator: string, value: string) => {
   // searchGuestPage.getMGMRewards().type(value);
  cy.then(()=>{
  // eslint-disable-next-line no-eval
  eval(`${page}Page.get${locator}().type(${value})`);
  }
  ); ```