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-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-Module provides core (low level) API for working with events in the SDK. This
-API is mainly for implementing higher level event APIs.
-
-Event `listener` may be registered on any (event `target`) object using
-provided `on` function:
-
-    var { on, once, off, emit } = require('api-utils/event/core');
-    var target = { name: 'target' };
-    on(target, 'message', function listener(event) {
-      console.log('hello ' + event);
-    });
-    on(target, 'data', console.log);
-
-Event of specific `type` may be emitted on any event `target` object using
-`emit` function. This will call all registered `listener`s for the given `type`
-on the given event `target` in the same order they were registered.
-
-    emit(target, 'message', 'event');
-    // info: 'hello event'
-    emit(target, 'data', { type: 'data' }, 'second arg');
-    // info: [Object object] 'second arg'
-
-Registered event listeners may be removed using `off` function:
-
-    off(target, 'message');
-    emit(target, 'message', 'bye');
-    // info: 'hello bye'
-
-Sometimes listener only cares about first event of specific `type`. To avoid
-hassles of removing such listeners there is convenient `once` function:
-
-    once(target, 'load', function() {
-      console.log('ready');
-    });
-    emit(target, 'load')
-    // info: 'ready'
-    emit(target, 'load')
-
-There are also convenient ways to remove registered listeners. All listeners of
-the specific type can be easily removed (only two argument must be passed):
-
-    off(target, 'message');
-
-Also, removing all registered listeners is possible (only one argument must be
-passed):
-
-    off(target);