You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: plugin.rs
    path of file: ./repos/tauri/core/tauri/src/webview
    
    the code of the file until where you have to start completion: // Copyright 2019-2024 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

//! The tauri plugin to create and manipulate windows from JS.

use crate::{
  plugin::{Builder, TauriPlugin},
  Runtime,
};

#[cfg(desktop)]
mod desktop_commands {

  use serde::Deserialize;
  use tauri_runtime::window::dpi::{Position, Size};
  use tauri_utils::config::{WebviewUrl, WindowConfig};

  use super::*;
  use crate::{
    command, sealed::ManagerBase, utils::config::WindowEffectsConfig, AppHandle, Webview,
    WebviewWindowBuilder,
  };

  #[derive(Debug, PartialEq, Clone, Deserialize)]
  #[serde(rename_all = "camelCase")]
  pub struct WebviewConfig {
    #[serde(default)]
    url: WebviewUrl,
    user_a
    
pub fn init<R: Runtime>() -> TauriPlugin<R> {
  #[allow(unused_mut)]
  let mut init_script = String::new();
  // window.print works on Linux/Windows; need to use the API on macOS
  #[cfg(any(target_os = "macos", target_os = "ios"))]
  {
    init_script.push_str(include_str!("./scripts/print.js"));
  }

  #[cfg(any(debug_assertions, feature = "devtools"))]
  {
    use serialize_to_javascript::{default_template, DefaultTemplate, Template};

    #[derive(Template)]
    #[default_template("./scripts/toggle-devtools.js")]
    struct Devtools<'a> {
      os_name: &'a str,
    }

    init_script.push_str(
      &Devtools {
        os_name: std::env::consts::OS,
      }
      .render_default(&Default::default())
      .unwrap()
      .into_string(),
    );
  }

  let mut builder = Builder::new("webview");
  if !init_script.is_empty() {
    builder = builder.js_init_script(init_script);
  }

  builder
    .invoke_handler(|invoke| {
      #[cfg(desktop)]
      {
        let handler: Box<dyn Fn(crate::ipc::Invoke<R>) -> bool> =
          Box::new(crate::generate_handler![
            desktop_commands::create_webview,
            desktop_commands::create_webview_window,
            // getters
            desktop_commands::webview_position,
            desktop_commands::webview_size,
            // setters
            desktop_commands::webview_close,
            desktop_commands::set_webview_size,
            desktop_commands::set_webview_position,
            desktop_commands::set_webview_focus,
            desktop_commands::print,
            desktop_commands::reparent,
            #[cfg(any(debug_assertions, feature = "devtools"))]
            desktop_commands::internal_toggle_devtools,
          ]);
        handler(invoke)
      }
      #[cfg(mobile)]
      {
        invoke
          .resolver
          .reject("Webview API not available on mobile");
        true
      }
    })
    .build()
}