Here is an example of how to track bugs in an app using JavaScript and a third-party library called Bugsnag:

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// include Bugsnag library
<script src="https://cdn.jsdelivr.net/npm/bugsnag-js@6.3.3/dist/bugsnag.min.js"></script>

// initialize Bugsnag with API key
Bugsnag.start({
  apiKey: "YOUR-API-KEY"
});

// track errors in your app
try {
  // code that could throw an error
} catch(error) {
  Bugsnag.notify(error);
}

You would need to replace "YOUR-API-KEY" with your own API key from Bugsnag, which you can create by signing up for an account on their website.

This is just one example of how to track bugs in an app using JavaScript and Bugsnag. There are many other tools and libraries available, so it's important to find the one that works best for your needs.

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Strict Mode is an opt-in feature in React that helps developers to identify and fix potential issues in their code. It provides warnings about legacy code patterns, identify potential mistakes and also performs additional checks and warnings. React only activates Strict Mode in development, in order to help developers identify issues for their own projects. For example, Strict Mode detects accidentalFragment props passing and usage of legacy string refs API. Code snippet might look like below:

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ReactDOM.render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
  document.getElementById('root')
);

You can use the Date.now() method provided by the Javascript Date object to get the current date and time. To add this to the app, you can either create a Date instance using new Date() and assign the returned value of Date.now() to it or pass Date.now() as an argument to the function.

As an example, you can do the following in your Javascript code:

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let currentDate = new Date(Date.now());

Now currentDate will have a Date object with the value of the current date and time. You can further manipulate this Date object to adhere to the desired format for your app.

It is likely you have an issue with your application code. React (and other JavaScript-based frameworks) rely on being run in a single thread. If you create an infinite loop in a part of the code, or else specifically ask the code not to finish, the application can become stuck. You can also have issues with circular code dependencies. It is recommended to check the code for typical mistakes like syntax errors, or else log events in the application to help track down the source of the inconsistency.

Yes, you can use Unicode emoji characters in your apps. For example, in Python you can use the Unicode escape sequence \U to insert an emoji character into a string, like this:

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print("\U0001F600")

This will output a smiling face emoji, which looks like this: 😀

An example of a React App component structure could look like this:

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class App extends React.Component {
  render() {
    return (
      <React.Fragment>
        <Header />
        <Main />
        <Footer />
      </React.Fragment>
    )
  }
}

class Header extends React.Component {
  ...
}

class Main extends React.Component {
  ...
}

class Footer extends React.Component {
  ...
}