Turbopack doesn't have `loadModule` on the loader interface#78693

### Link to the code that reproduces this issue https://github.com/Mad-Kat/turbopack-load-module ### To Reproduce 1. Clone this repo 2. Build with Turbopack: ```bash npm run build:turbo # or yarn build:turbo # or pnpm build:turbo # or bun build:turbo ``` 3. The loader will throw an error when processing CSS modules because `loadModule` is undefined in the Turbopack loader context. If you run the same command with `build` instead of `build:turbo`, the loader will work as expected. ### Current vs. Expected behavior **Expected Behavior** The `loadModule` method should be available in the Turbopack loader interface, just as it is in webpack loaders. **Actual Behavior** When running under Turbopack, `this.loadModule` is undefined, causing the loader to throw an error. ### Provide environment information ```bash Operating System: Platform: darwin Arch: arm64 Version: Darwin Kernel Version 24.4.0: Fri Apr 11 18:32:50 PDT 2025; root:xnu-11417.101.15~117/RELEASE_ARM64_T6041 Available memory (MB): 49152 Available CPU cores: 14 Binaries: Node: 22.15.0 npm: 10.9.2 Yarn: 4.9.1 pnpm: 10.2.1 Relevant Packages: next: 15.4.0-canary.15 // Latest available version is detected (15.4.0-canary.15). eslint-config-next: 15.4.0-canary.15 react: 19.1.0 react-dom: 19.1.0 typescript: 5.8.3 Next.js Config: output: N/A ``` ### Which area(s) are affected? (Select all that apply) Turbopack ### Which stage(s) are affected? (Select all that apply) next dev (local) ### Additional context Works correctly with webpack