feat: add abortSignal for cancelling of async function

Author: yioneko

lua/nvim-tree/async.lua

@@ -128,4 +128,37 @@ end
 
 M.Interrupter = Interrupter
 
+---This is useful for cancelling execution async function
+---@class AbortSignal
+---@field aborted boolean
+---@field private abort_cbs function[]
+local AbortSignal = {}
+
+---@return AbortSignal
+function AbortSignal.new()
+  local obj = {
+    aborted = false,
+    abort_cbs = {},
+  }
+
+  setmetatable(obj, { __index = AbortSignal })
+  return obj
+end
+
+function AbortSignal:abort()
+  if not self.aborted then
+    self.aborted = true
+    for _, cb in pairs(self.abort_cbs) do
+      cb()
+    end
+  end
+end
+
+---@param cb function
+function AbortSignal:on_abort(cb)
+  table.insert(self.abort_cbs, cb)
+end
+
+M.AbortSignal = AbortSignal
+
 return M