如何订阅事件(创建主题、关闭主题等)

找到它们的最佳方法是什么?我正在搜索 onAppEvent,但结果不多:

$ grep -r onAppEvent *
app/assets/javascripts/discourse/lib/plugin-api.js.es6:    this.onAppEvent("page:changed", data => fn(data.url, data.title));
app/assets/javascripts/discourse/lib/plugin-api.js.es6:      api.onAppEvent('inserted-custom-html', () => {
app/assets/javascripts/discourse/lib/plugin-api.js.es6:  onAppEvent(name, fn) {
jsapp/lib/plugin-api.js.es6:    this.onAppEvent("page:changed", data => fn(data.url, data.title));
jsapp/lib/plugin-api.js.es6:      api.onAppEvent('inserted-custom-html', () => {
jsapp/lib/plugin-api.js.es6:  onAppEvent(name, fn) {