Accept an async listener in the types and normalise any rejection reason

eslint.config.js

@@ -48,13 +48,6 @@ export default tseslint.config(
 		files: ['src/defs/encodings.ts'],
 		rules: { 'no-control-regex': 'off' },
 	},
-	{
-		// An async event listener is a documented, supported shape; EventEmitter types listeners void.
-		files: ['test/*.test.ts'],
-		rules: {
-			'@typescript-eslint/no-misused-promises': ['error', { checksVoidReturn: { arguments: false } }],
-		},
-	},
 	{
 		files: ['eslint.config.js'],
 		extends: [tseslint.configs.disableTypeChecked],