| name | pakop-wasm |
| description | The pakop C#/.NET WASM module (CUE4Parse-based) — what it does (pak-file inspection/hashing), how to build it (pnpm build:pakop), and how to consume it (lazy dynamic import). Read before touching wasm/pakop or the pak routes. |
pakop (C# .NET WASM, CUE4Parse)
- C# project at
wasm/pakop/ (Pakop.csproj, .NET 10 browser WASM, no Blazor); provides pak-file inspection and hashing (list, list_hash, get_datatables_names, print_exports) used by the /pak routes (src/routes/pak/). Built on CUE4Parse.
- Build is an explicit prebuild step:
pnpm build:pakop (dotnet build -c Release; required before pnpm dev/pnpm build, rerun after C# changes — in CI the wasm.yml workflow builds it once and shares the artifact). Requires .NET SDK 10 + dotnet workload install wasm-tools.
- The shim imports
./bin/Release/net10.0/wwwroot/_framework/dotnet.js directly. The bundler-friendly dotnet.js statically imports every runtime .wasm asset, so Vite bundles the whole graph with content-hashed names into _app/immutable/assets/. Since Vite 8.1, its built-in wasm-ESM integration intercepts direct .wasm imports and expects a default export from the parsed module — the .NET runtime's .wasm blobs don't have one, which breaks the build (MISSING_EXPORT "default"). vite-plugins/dotnet-wasm-asset.ts (dotnetWasmAssetPlugin, registered first in vite.config.ts) works around this by resolving those specific _framework/**/*.{wasm,pdb,dat} imports with a ?url suffix, which is exempt from that interception and resolves as a plain asset URL.
- The npm workspace package
pakop is the committed shim wasm/pakop/index.js + index.d.ts: it statically imports /assets/_framework/dotnet.js, initializes via top-level await, then exposes synchronous functions delegating to [JSExport] methods in Interop.cs. list_hash returns JSON-parsed plain objects.
- Always lazy-load to keep the .NET runtime out of the main bundle:
const { list_hash } = await import('pakop');
- C# changes must pass
dotnet format wasm/pakop --verify-no-changes (enforced by lefthook) and require a rebuild (pnpm build:pakop) before the frontend sees them.
- Vite side:
optimizeDeps.exclude: ['pakop'] and server.fs.allow includes wasm/; the pnpm workspace glob is wasm/* (direct children only — the dotnet build output contains a copied package.json that a deep glob would pick up as a duplicate workspace package).
Related: [[architecture]], [[git-hooks]], [[path-aliases]]
