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+# 3.3.0
+
+ - Support EventTarget emitters in `events.once` from Node.js 12.11.0.
+
+ Now you can use the `events.once` function with objects that implement the EventTarget interface. This interface is used widely in
+ the DOM and other web APIs.
+
+ ```js
+ var events = require('events');
+ var assert = require('assert');
+
+ async function connect() {
+ var ws = new WebSocket('wss://example.com');
+ await events.once(ws, 'open');
+ assert(ws.readyState === WebSocket.OPEN);
+ }
+
+ async function onClick() {
+ await events.once(document.body, 'click');
+ alert('you clicked the page!');
+ }
+ ```
+
+# 3.2.0
+
+ - Add `events.once` from Node.js 11.13.0.
+
+ To use this function, Promises must be supported in the environment. Use a polyfill like `es6-promise` if you support older browsers.
+
+# 3.1.0 (2020-01-08)
+
+`events` now matches the Node.js 11.12.0 API.
+
+ - pass through return value in wrapped `emitter.once()` listeners
+
+ Now, this works:
+ ```js
+ emitter.once('myevent', function () { return 1; });
+ var listener = emitter.rawListeners('myevent')[0]
+ assert(listener() === 1);
+ ```
+ Previously, `listener()` would return undefined regardless of the implementation.
+
+ Ported from https://github.com/nodejs/node/commit/acc506c2d2771dab8d7bba6d3452bc5180dff7cf
+
+ - Reduce code duplication in listener type check ([#67](https://github.com/Gozala/events/pull/67) by [@friederbluemle](https://github.com/friederbluemle)).
+ - Improve `emitter.once()` performance in some engines
+
+# 3.0.0 (2018-05-25)
+
+**This version drops support for IE8.** `events` no longer includes polyfills
+for ES5 features. If you need to support older environments, use an ES5 shim
+like [es5-shim](https://npmjs.com/package/es5-shim). Both the shim and sham
+versions of es5-shim are necessary.
+
+ - Update to events code from Node.js 10.x
+ - (semver major) Adds `off()` method
+ - Port more tests from Node.js
+ - Switch browser tests to airtap, making things more reliable
+
+# 2.1.0 (2018-05-25)
+
+ - add Emitter#rawListeners from Node.js v9.4
+
+# 2.0.0 (2018-02-02)
+
+ - Update to events code from node.js 8.x
+ - Adds `prependListener()` and `prependOnceListener()`
+ - Adds `eventNames()` method
+ - (semver major) Unwrap `once()` listeners in `listeners()`
+ - copy tests from node.js
+
+Note that this version doubles the gzipped size, jumping from 1.1KB to 2.1KB,
+due to new methods and runtime performance improvements. Be aware of that when
+upgrading.
+
+# 1.1.1 (2016-06-22)
+
+ - add more context to errors if they are not instanceof Error
+
+# 1.1.0 (2015-09-29)
+
+ - add Emitter#listerCount (to match node v4 api)
+
+# 1.0.2 (2014-08-28)
+
+ - remove un-reachable code
+ - update devDeps
+
+## 1.0.1 / 2014-05-11
+
+ - check for console.trace before using it
+
+## 1.0.0 / 2013-12-10
+
+ - Update to latest events code from node.js 0.10
+ - copy tests from node.js
+
+## 0.4.0 / 2011-07-03 ##
+
+ - Switching to graphquire@0.8.0
+
+## 0.3.0 / 2011-07-03 ##
+
+ - Switching to URL based module require.
+
+## 0.2.0 / 2011-06-10 ##
+
+ - Simplified package structure.
+ - Graphquire for dependency management.
+
+## 0.1.1 / 2011-05-16 ##
+
+ - Unhandled errors are logged via console.error
+
+## 0.1.0 / 2011-04-22 ##
+
+ - Initial release