devtools/build/commands/dismissAlert.js

A Chrome DevTools protocol binding that maps WebDriver commands into Chrome DevTools commands using Puppeteer

/**
 * The Dismiss Alert command dismisses a simple dialog if present, otherwise error.
 * A request to dismiss an alert user prompt, which may not necessarily have a dismiss button,
 * has the same effect as accepting it.
 *
 * @alias browser.dismissAlert
 * @see https://w3c.github.io/webdriver/#dfn-dismiss-alert
 */
export default async function dismissAlert() {
    if (!this.activeDialog) {
        throw new Error('no such alert');
    }
    await this.activeDialog.dismiss();
    delete this.activeDialog;
    return null;
}