wdio-wait-for/dist/browser/numberOfWindowsToBe.js

a library of conditions that are useful for end-to-end tests

/**
 * A condition for checking the number of opened windows.
 *
 * @example
 * browser.waitUntil(numberOfWindowsToBe(2));
 *
 * @param {!number} expectedNumber The expected url
 * @returns {!function} A condition that returns a promise
 *     representing whether browser's windows length.
 */
export function numberOfWindowsToBe(expectedNumber) {
    return async function () {
        const actualWindows = await this.getWindowHandles();
        return actualWindows.length === expectedNumber;
    };
}