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518ce9c25f
We really needed this for Flight before as well but we got away with it because Blocks were lazy but with the removal of Blocks, we'll need this to ensure that we can lazily stream in part of the content. Luckily LazyComponent isn't really just a Component. It's just a generic type that can resolve into anything kind of like a Promise. So we can use that to resolve elements just like we can components. This allows keys and props to become lazy as well. To accomplish this, we suspend during reconciliation. This causes us to not be able to render siblings because we don't know if the keys will reconcile. For initial render we could probably special case this and just render a lazy component fiber. Throwing in reconciliation didn't work correctly with direct nested siblings of a Suspense boundary before but it does now so it depends on new reconciler.
127 lines
4.9 KiB
JavaScript
127 lines
4.9 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict
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*/
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// Filter certain DOM attributes (e.g. src, href) if their values are empty strings.
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// This prevents e.g. <img src=""> from making an unnecessar HTTP request for certain browsers.
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export const enableFilterEmptyStringAttributesDOM = false;
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// Adds verbose console logging for e.g. state updates, suspense, and work loop stuff.
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// Intended to enable React core members to more easily debug scheduling issues in DEV builds.
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export const enableDebugTracing = false;
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// Helps identify side effects in render-phase lifecycle hooks and setState
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// reducers by double invoking them in Strict Mode.
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export const debugRenderPhaseSideEffectsForStrictMode = __DEV__;
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// To preserve the "Pause on caught exceptions" behavior of the debugger, we
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// replay the begin phase of a failed component inside invokeGuardedCallback.
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export const replayFailedUnitOfWorkWithInvokeGuardedCallback = __DEV__;
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// Warn about deprecated, async-unsafe lifecycles; relates to RFC #6:
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export const warnAboutDeprecatedLifecycles = true;
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// Gather advanced timing metrics for Profiler subtrees.
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export const enableProfilerTimer = __PROFILE__;
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// Record durations for commit and passive effects phases.
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export const enableProfilerCommitHooks = false;
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// Trace which interactions trigger each commit.
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export const enableSchedulerTracing = __PROFILE__;
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// SSR experiments
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export const enableSuspenseServerRenderer = __EXPERIMENTAL__;
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export const enableSelectiveHydration = __EXPERIMENTAL__;
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// Flight experiments
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export const enableBlocksAPI = __EXPERIMENTAL__;
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export const enableLazyElements = __EXPERIMENTAL__;
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// Only used in www builds.
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export const enableSchedulerDebugging = false;
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// Disable javascript: URL strings in href for XSS protection.
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export const disableJavaScriptURLs = false;
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// Experimental React Flare event system and event components support.
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export const enableDeprecatedFlareAPI = false;
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// Experimental Host Component support.
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export const enableFundamentalAPI = false;
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// Experimental Scope support.
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export const enableScopeAPI = false;
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// Experimental Create Event Handle API.
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export const enableCreateEventHandleAPI = false;
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// New API for JSX transforms to target - https://github.com/reactjs/rfcs/pull/107
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// We will enforce mocking scheduler with scheduler/unstable_mock at some point. (v18?)
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// Till then, we warn about the missing mock, but still fallback to a legacy mode compatible version
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export const warnAboutUnmockedScheduler = false;
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// Add a callback property to suspense to notify which promises are currently
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// in the update queue. This allows reporting and tracing of what is causing
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// the user to see a loading state.
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// Also allows hydration callbacks to fire when a dehydrated boundary gets
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// hydrated or deleted.
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export const enableSuspenseCallback = false;
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// Part of the simplification of React.createElement so we can eventually move
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// from React.createElement to React.jsx
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// https://github.com/reactjs/rfcs/blob/createlement-rfc/text/0000-create-element-changes.md
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export const warnAboutDefaultPropsOnFunctionComponents = false;
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export const disableSchedulerTimeoutBasedOnReactExpirationTime = false;
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export const enableTrustedTypesIntegration = false;
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// Enables a warning when trying to spread a 'key' to an element;
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// a deprecated pattern we want to get rid of in the future
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export const warnAboutSpreadingKeyToJSX = false;
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export const enableComponentStackLocations = __EXPERIMENTAL__;
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export const enableNewReconciler = false;
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// --------------------------
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// Future APIs to be deprecated
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// --------------------------
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// Prevent the value and checked attributes from syncing
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// with their related DOM properties
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export const disableInputAttributeSyncing = false;
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export const warnAboutStringRefs = false;
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export const disableLegacyContext = false;
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// Disables children for <textarea> elements
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export const disableTextareaChildren = false;
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export const disableModulePatternComponents = false;
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// We should remove this flag once the above flag becomes enabled
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export const warnUnstableRenderSubtreeIntoContainer = false;
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// Modern event system where events get registered at roots
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export const enableModernEventSystem = false;
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// Support legacy Primer support on internal FB www
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export const enableLegacyFBSupport = false;
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// Updates that occur in the render phase are not officially supported. But when
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// they do occur, in the new reconciler, we defer them to a subsequent render by
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// picking a lane that's not currently rendering. We treat them the same as if
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// they came from an interleaved event. In the old reconciler, we use whatever
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// expiration time is currently rendering. Remove this flag once we have
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// migrated to the new behavior.
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export const deferRenderPhaseUpdateToNextBatch = true;
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