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: shader.rs
    path of file: ./repos/bevy/crates/bevy_render/src/render_resource
    
    the code of the file until where you have to start completion: use super::ShaderDefVal;
use crate::define_atomic_id;
use bevy_asset::{io::Reader, Asset, AssetLoader, AssetPath, Handle, LoadContext};
use bevy_reflect::TypePath;
use bevy_utils::{tracing::error, BoxedFuture};
use futures_lite::AsyncReadExt;
use std::{borrow::Cow, marker::Copy};
use thiserror::Error;

define_atomic_id!(ShaderId);

#[derive(Error, Debug)]
pub enum ShaderReflectE
    
    fn preprocess(source: &str, path: &str) -> (ShaderImport, Vec<ShaderImport>) {
        let (import_path, imports, _) = naga_oil::compose::get_preprocessor_data(source);

        let import_path = import_path
            .map(ShaderImport::Custom)
            .unwrap_or_else(|| ShaderImport::AssetPath(path.to_owned()));

        let imports = imports
            .into_iter()
            .map(|import| {
                if import.import.starts_with('\"') {
                    let import = import
                        .import
                        .chars()
                        .skip(1)
                        .take_while(|c| *c != '\"')
                        .collect();
                    ShaderImport::AssetPath(import)
                } else {
                    ShaderImport::Custom(import.import)
                }
            })
            .collect();

        (import_path, imports)
    }