Those modules do not extend EventEmitter actually

app/current/src/main/scala/io/scalajs/nodejs/Assert.scala

@@ -1,7 +1,5 @@
 package io.scalajs.nodejs
 
-import io.scalajs.nodejs.events.IEventEmitter
-
 import scala.scalajs.js
 import scala.scalajs.js.annotation.JSImport
 import scala.scalajs.js.|
@@ -15,7 +13,7 @@ import scala.scalajs.js.|
   * methods implemented and exposed by the module.
   */
 @js.native
-trait Assert extends IEventEmitter {
+trait Assert extends js.Object {
 
   /**
     * An alias of assert.ok() .

app/current/src/main/scala/io/scalajs/nodejs/events/EventEmitter.scala

@@ -138,7 +138,7 @@ trait IEventEmitter extends js.Object {
   */
 @js.native
 @JSImport("events", JSImport.Namespace)
-object EventEmitter extends IEventEmitter {
+object EventEmitter extends js.Object {
 
   /**
     * By default, a maximum of 10 listeners can be registered for any single event. This limit can be changed

app/current/src/main/scala/io/scalajs/nodejs/fs/Fs.scala

@@ -3,7 +3,6 @@ package fs
 
 import com.thoughtworks.{enableIf, enableMembersIf}
 import io.scalajs.nodejs.buffer.Buffer
-import io.scalajs.nodejs.events.IEventEmitter
 
 import scala.scalajs.js
 import scala.scalajs.js.annotation.JSImport
@@ -22,7 +21,7 @@ import scala.scalajs.js.|
   * or allow them to bubble up.
   */
 @js.native
-trait Fs extends IEventEmitter with FSConstants {
+trait Fs extends js.Object with FSConstants {
 
   /**
     * Returns an object containing commonly used constants for file system operations

app/current/src/main/scala/io/scalajs/nodejs/net/Net.scala

@@ -1,7 +1,5 @@
 package io.scalajs.nodejs.net
 
-import io.scalajs.nodejs.events.IEventEmitter
-
 import scala.scalajs.js
 import scala.scalajs.js.annotation.JSImport
 
@@ -11,7 +9,7 @@ import scala.scalajs.js.annotation.JSImport
   * @see https://nodejs.org/api/net.html
   */
 @js.native
-trait Net extends IEventEmitter {
+trait Net extends js.Object {
   /////////////////////////////////////////////////////////////////////////////////
   //      Methods
   /////////////////////////////////////////////////////////////////////////////////

app/current/src/main/scala/io/scalajs/nodejs/readline/Readline.scala

@@ -1,6 +1,5 @@
 package io.scalajs.nodejs.readline
 
-import io.scalajs.nodejs.events.IEventEmitter
 import io.scalajs.nodejs.stream.{IReadable, IWritable}
 
 import scala.scalajs.js
@@ -13,7 +12,7 @@ import scala.scalajs.js.annotation.JSImport
   * @see https://nodejs.org/api/readline.html
   */
 @js.native
-trait Readline extends IEventEmitter {
+trait Readline extends js.Object {
 
   /**
     * Clears current line of given TTY stream in a specified direction. <tt>dir</tt> should have one of following values:

app/current/src/main/scala/io/scalajs/nodejs/repl/REPL.scala

@@ -1,6 +1,5 @@
 package io.scalajs.nodejs.repl
 
-import io.scalajs.nodejs.events.IEventEmitter
 import io.scalajs.nodejs.stream
 
 import scala.scalajs.js
@@ -12,7 +11,7 @@ import scala.scalajs.js.annotation.JSImport
   * @see https://nodejs.org/api/repl.html#repl_repl
   */
 @js.native
-trait REPL extends IEventEmitter {
+trait REPL extends js.Object {
   var REPL_MODE_SLOPPY: js.Symbol = js.native
   var REPL_MODE_STRICT: js.Symbol = js.native
 

app/current/src/main/scala/io/scalajs/nodejs/url/URL.scala

@@ -1,8 +1,6 @@
 package io.scalajs.nodejs
 package url
 
-import io.scalajs.nodejs.events.IEventEmitter
-
 import scala.scalajs.js
 import scala.scalajs.js.annotation.JSImport
 import scala.scalajs.js.|
@@ -107,7 +105,7 @@ class URL(input: String, base: String | URL = js.native) extends js.Object {
   */
 @js.native
 @JSImport("url", JSImport.Namespace)
-object URL extends IEventEmitter {
+object URL extends js.Object {
 
   /**
     * Take a parsed URL object, and return a formatted URL string.

app/current/src/main/scala/io/scalajs/nodejs/zlib/Zlib.scala

@@ -1,7 +1,6 @@
 package io.scalajs.nodejs.zlib
 
 import com.thoughtworks.enableIf
-import io.scalajs.nodejs.events.IEventEmitter
 
 import scala.scalajs.js
 import scala.scalajs.js.annotation.JSImport
@@ -12,7 +11,7 @@ import scala.scalajs.js.annotation.JSImport
   * @see https://nodejs.org/docs/latest/api/zlib.html
   */
 @js.native
-trait Zlib extends IEventEmitter with UncategorizedConstants with ZlibConstants {
+trait Zlib extends js.Object with UncategorizedConstants with ZlibConstants {
   @enableIf(io.scalajs.nodejs.internal.CompilerSwitches.gteNodeJs12)
   def createBrotliCompress(options: BrotliOptions = js.native): BrotliCompress = js.native