How to use the nightwatch-api.client.expect function in nightwatch-api

Then(/^I can see the last word$/, async () => {
    await browser
        .expect.element("#checksum_word")
        .to.be.visible
});
Then(/^the last word should be "([^"]*)"$/, async word => {

Then(/^the last word of the phrase should be "([^"]*)"$/, async function (word) {
    await browser
        .expect.elements("#phrase").text
        .to.endWith(word);
});
Then(/^the last word of the phrase should be the one word in the word list$/, async function () {

Then(/^the last word should be "([^"]*)"$/, async word => {
    await browser
        .expect.element("#checksum_word").text
        .to.equal(word)
});
Then(/^the Extended Public Key should start with "([^"]*)"$/, async word => {

Then(/^the word list should contain (\d+) (?:word|words)$/, async noOfWords => {
    await browser
        .expect.elements("#word_table > tr")
        .count.to.equal(noOfWords);
});
When(/^I click the "([^"]*)" button$/, async function (button) {