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Summary: This is a follow up of the work by brentvatne in #5052. This addresses the feedback by astreet. - Uses ReactChoreographer with a new callback type - Callback dispatch logic moved to JS - Only calls into JS when needed, when there are pending callbacks, it even removes the Choreographer listener when no JS context listen for idle events. ** Test plan ** Tested by running a background task that burns all remaining idle time (see new UIExplorer example) and made sure that UI and JS fps stayed near 60 on a real device (Nexus 6) with dev mode disabled. Also tried adding a JS driven animation and it stayed smooth. Tested that native only calls into JS when there are pending idle callbacks. Also tested that timers are executed before idle callback. ``` requestIdleCallback(() => console.log(1)); setTimeout(() => console.log(2), 100); burnCPU(1000); // 2 // 1 ``` I did *not* test with webworkers but it should work as I'm using executor tokens. Closes https://github.com/facebook/react-native/pull/8569 Differential Revision: D3558869 Pulled By: astreet fbshipit-source-id: 61fa82eb26001d2b8c2ea69c35bf3eb5ce5454ba
14 lines
531 B
JavaScript
14 lines
531 B
JavaScript
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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/* eslint-disable */
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// Add missing flow definitions, can be removed when included in flow.
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declare function requestIdleCallback(callback: any): number;
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declare function cancelIdleCallback(idleCallbackId: ?number): void;
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