add experiment for running the JS on view creation
Summary: Changelog: [Internal] # Context Whilst looking at Marketplace Loom traces, ShikaSD made the remark that we could potentially start the JS work much earlier instead of waiting for the View.onMeasure call, a behaviour that is already built-in Venice. Reviewed By: ShikaSD Differential Revision: D32559505 fbshipit-source-id: cc6337955ad2b6a6581a0347f1f976679eaca54d
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@ -44,6 +44,7 @@ import com.facebook.react.bridge.UiThreadUtil;
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import com.facebook.react.bridge.WritableMap;
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import com.facebook.react.bridge.WritableNativeMap;
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import com.facebook.react.common.annotations.VisibleForTesting;
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import com.facebook.react.config.ReactFeatureFlags;
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import com.facebook.react.modules.appregistry.AppRegistry;
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import com.facebook.react.modules.core.DeviceEventManagerModule;
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import com.facebook.react.modules.deviceinfo.DeviceInfoModule;
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@ -439,7 +440,11 @@ public class ReactRootView extends FrameLayout implements RootView, ReactRoot {
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mInitialUITemplate = initialUITemplate;
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mReactInstanceManager.createReactContextInBackground();
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// if in this experiment, we initialize the root earlier in startReactApplication
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// instead of waiting for the initial measure
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if (ReactFeatureFlags.enableEagerRootViewAttachment) {
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attachToReactInstanceManager();
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}
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} finally {
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Systrace.endSection(TRACE_TAG_REACT_JAVA_BRIDGE);
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}
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@ -80,6 +80,9 @@ public class ReactFeatureFlags {
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/** Feature flag to configure eager initialization of MapBuffer So file */
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public static boolean enableEagerInitializeMapBufferSoFile = false;
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/** Feature flag to configure eager attachment of the root view/initialisation of the JS code */
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public static boolean enableEagerRootViewAttachment = false;
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private static boolean mapBufferSerializationEnabled = false;
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/** Enables or disables MapBuffer Serialization */
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