Puppeteer: How to write XPath for button in puppeteer

var eleLoginButton = await page.waitForXPath("//input[@class='._ant-btn._ant-btn-primary']")
await eleLoginButton.click()

My Code is not getting Excuted if I have written it like this.

You do not need dot for class in XPath. Try this:

var eleLoginButton = await page.waitForXPath("//input[@class='_ant-btn _ant-btn-primary']");
await eleLoginButton.click();