errors and warnings / stdlib / E8002

E8002 error

@event on an instance method

area: stdlib (x8xxx)
fails the build: yes

@event, @bucket and @unitEvent register a function when the module (or the class) is defined. An instance method has no object at that time, so these decorators can't go on one; on a static method they are fine.

Subscribe in the constructor instead, with on(name, handler, self) (or onBucket / onUnit), and call offAll(self) when the object is discarded.

Example

× failswowlua

import event from "wowlua:events" class Tracker    @event("PLAYER_LOGIN")    function onLogin()        print("logged in")    endend

✓ compileswowlua

import on from "wowlua:events" class Tracker    constructor()        on("PLAYER_LOGIN", function() self:onLogin() end, self)    end     function onLogin()        print("logged in")    endend local tracker = Tracker.new()print(tracker)

The compiler reports it like this:

error[E8002]: `@event` on an instance method: register with `on(…, self)` in the constructor
  ┌─ src/main.wowlua:4:5
  │
4 │     @event("PLAYER_LOGIN")
  │     ^^^^^^^^^^^^^^^^^^^^^^ an instance method

code	message
E8003	Unknown event or message name

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terminal

$ wowlua explain E8002
E8002 (error): @event on an instance method

source on GitHub ↗

Example

Related codes

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