Internal eleventy# events automatically reset on every build

src/Eleventy.js

@@ -490,6 +490,8 @@ class Eleventy {
 
 		if (!this.#hasConfigInitialized) {
 			await this.initializeConfig();
+		} else {
+			this.config.events.reset();
 		}
 
 		await this.config.events.emit("eleventy.config", this.eleventyConfig);

src/EventBus.js

@@ -16,7 +16,7 @@ debug("Setting up global EventBus.");
  * @type {module:11ty/eleventy/Util/AsyncEventEmitter~AsyncEventEmitter}
  */
 let bus = new EventEmitter();
-bus.setMaxListeners(100);
+bus.setMaxListeners(100); // defaults to 10
 
 debug("EventBus max listener count: %o", bus.getMaxListeners());
 

src/Util/AsyncEventEmitter.js

@@ -12,6 +12,15 @@ class AsyncEventEmitter extends EventEmitter {
 		super(...args);
 	}
 
+	reset() {
+		// `eleventy#` event type listeners are removed at the start of each build (singletons)
+		for (let type of this.eventNames()) {
+			if (typeof type === "string" && type.startsWith("eleventy#")) {
+				this.removeAllListeners(type);
+			}
+		}
+	}
+
 	/**
 	 * @param {string} type - The event name to emit.
 	 * @param {...*} args - Additional arguments that get passed to listeners.