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There are several reasons for the large file size of laravel app.js:

1. Dependencies: Laravel app.js includes popular JavaScript libraries such as Bootstrap, jQuery, and Vue.js. These libraries contribute to the overall file size of the application.

2. Features: Laravel app.js includes many features that make it easier to develop web applications, such as form validation, AJAX requests, and Vue components. These features require additional code, which increases the file size.

3. Unused code: Sometimes, developers include code that is not used in the application. This can happen when they copy and paste code from other projects or use a template that includes unnecessary JavaScript.

4. Development mode: Laravel app.js includes extra code for debugging and development purposes. This code is not needed in the production environment, but it is still included in the file.

To reduce the file size of Laravel app.js, developers can remove unused code, minimize dependencies, and only include features that are necessary for the application. They can also use tools such as Webpack or Laravel Mix to optimize the code and reduce the file size.