first commit

node_modules/@parcel/watcher/src/wasm/WasmBackend.hh

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+#ifndef WASM_H
+#define WASM_H
+
+#include <unordered_map>
+#include "../shared/BruteForceBackend.hh"
+#include "../DirTree.hh"
+
+extern "C" {
+  int wasm_backend_add_watch(const char *filename, void *backend);
+  void wasm_backend_remove_watch(int wd);
+  void wasm_backend_event_handler(void *backend, int wd, int type, char *filename);
+};
+
+struct WasmSubscription {
+  std::shared_ptr<DirTree> tree;
+  std::string path;
+  WatcherRef watcher;
+};
+
+class WasmBackend : public BruteForceBackend {
+public:
+  void start() override;
+  void subscribe(WatcherRef watcher) override;
+  void unsubscribe(WatcherRef watcher) override;
+  void handleEvent(int wd, int type, char *filename);
+private:
+  int mWasm;
+  std::unordered_multimap<int, std::shared_ptr<WasmSubscription>> mSubscriptions;
+
+  void watchDir(WatcherRef watcher, std::string path, std::shared_ptr<DirTree> tree);
+  bool handleSubscription(int type, char *filename, std::shared_ptr<WasmSubscription> sub);
+};
+
+#endif