"Target browser must be a string" Builder still expects browser.

[Rup1]

Hello, I am running on MacOS with the following package versions

"selenium-appium": "0.0.16",
"selenium-webdriver": "^4.0.0-alpha.7"

I have the following code:

const Webdriver = require('selenium-appium').WebDriver2;
const By = require('selenium-appium').By2;

const caps = {
    platformName: 'Mac',
    deviceName: "Mac",
    app: "Mail"
};

async function main() {
  const webdriver = new Webdriver();
  await webdriver.startWithCapabilities(caps)
  const element = await By.xpath("/AXApplication[@AXTitle='Mail']/AXWindow[@AXTitle='Inbox (1 message)' and @AXIdentifier='_NS:15' and @AXSubrole='AXStandardWindow']/AXGroup[@AXIdentifier='_NS:10']/AXCheckBox[@AXTitle='Sent' and @AXSubrole='AXToggle']");

  await element.click();
  await webdriver.quit()
}

main();

This causes

(node:18125) UnhandledPromiseRejectionWarning: TypeError: Target browser must be a string, but is <undefined>; did you forget to call forBrowser()?
    at Builder.build (/Users/User/Desktop/dev/appium-instagram/node_modules/selenium-webdriver/index.js:589:13)
    at Promise (/Users/User/Desktop/dev/appium-instagram/node_modules/selenium-appium/dist/driver.js:187:22)
    at new Promise (<anonymous>)
    at WebDriver2.startWithCapabilities (/Users/User/Desktop/dev/appium-instagram/node_modules/selenium-appium/dist/driver.js:182:16)
    at main (/Users/User/Desktop/dev/appium-instagram/macOsCalculator.js:13:19)
    at Object.<anonymous> (/Users/User/Desktop/dev/appium-instagram/macOsCalculator.js:20:1)
    at Module._compile (internal/modules/cjs/loader.js:688:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:699:10)
    at Module.load (internal/modules/cjs/loader.js:598:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:537:12)
(node:18125) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:18125) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Initially I tried using the official selenium-webdriver as found in one of your examples but this didn't work either.

const Builder = require('selenium-webdriver').Builder;
const By = require('selenium-appium').By2;

const url = 'http://localhost:4723/wd/hub'

const caps = {
    platformName: 'Mac',
    deviceName: "Mac",
    app: "Mail"
};

async function main() {
  const webdriver = await new Builder()
    .usingServer(url)
    .withCapabilities(caps)
    .build()

  const element = await webdriver.wait(until.elementLocated(By.xpath("/AXApplication[@AXTitle='Mail']/AXWindow[@AXTitle='Inbox (1 message)' and @AXIdentifier='_NS:15' and @AXSubrole='AXStandardWindow']/AXGroup[@AXIdentifier='_NS:10']/AXCheckBox[@AXTitle='Sent' and @AXSubrole='AXToggle']")));
    await element.click();
    await webdriver.quit()
}

main();

I understand you are from Microsoft and that your examples show this working on windows. Does this mean this wouldn't work at all with Appium For Mac? The error seems agnostic of the platform.

[licanhua]

I guess the error is raised from internal/modules/cjs/loader.js:537. From the output, likely, you should set browserName(possible browser) to something in cap but I don't know what exactly value it want

const caps = {
browserName:'something'
platformName: 'Mac',
deviceName: "Mac",
app: "Mail"
};

[Rup1]

I tried passing a variety of browser strings but same result.

[licanhua]

You can ask Appium For Mac that what kind of capabilities is required. I don't know too much about Mac