1 files changed, 64 insertions, 0 deletions
diff --git a/lua/mason-core/EventEmitter.lua b/lua/mason-core/EventEmitter.lua
new file mode 100644
index 00000000..672c1778
--- /dev/null
+++ b/lua/mason-core/EventEmitter.lua
@@ -0,0 +1,64 @@
+---@class EventEmitter
+---@field private __event_handlers table<any, table<fun(), fun()>>
+---@field private __event_handlers_once table<any, table<fun(), fun()>>
+local EventEmitter = {}
+EventEmitter.__index = EventEmitter
+
+---@generic T
+---@param obj T
+---@return T
+function EventEmitter.init(obj)
+    obj.__event_handlers = {}
+    obj.__event_handlers_once = {}
+    return obj
+end
+
+---@param event any
+function EventEmitter:emit(event, ...)
+    if self.__event_handlers[event] then
+        for handler in pairs(self.__event_handlers[event]) do
+            pcall(handler, ...)
+        end
+    end
+    if self.__event_handlers_once[event] then
+        for handler in pairs(self.__event_handlers_once[event]) do
+            pcall(handler, ...)
+            self.__event_handlers_once[handler] = nil
+        end
+    end
+end
+
+---@param event any
+---@param handler fun(payload: any)
+function EventEmitter:on(event, handler)
+    if not self.__event_handlers[event] then
+        self.__event_handlers[event] = {}
+    end
+    self.__event_handlers[event][handler] = handler
+end
+
+---@param event any
+---@parma handler fun(payload: any)
+function EventEmitter:once(event, handler)
+    if not self.__event_handlers_once[event] then
+        self.__event_handlers_once[event] = {}
+    end
+    self.__event_handlers_once[event][handler] = handler
+end
+
+---@param event any
+---@param handler fun(payload: any)
+function EventEmitter:off(event, handler)
+    if vim.tbl_get(self.__event_handlers, { event, handler }) then
+        self.__event_handlers[event][handler] = nil
+        return true
+    end
+    return false
+end
+
+function EventEmitter:clear_event_handlers()
+    self.__event_handlers = {}
+    self.__event_handlers_once = {}
+end
+
+return EventEmitter