()
| 54 | }; |
| 55 | |
| 56 | function getTestFlags() { |
| 57 | // These are required on demand because some of our tests mutate them. We try |
| 58 | // not to but there are exceptions. |
| 59 | const featureFlags = require('shared/ReactFeatureFlags'); |
| 60 | const schedulerFeatureFlags = require('scheduler/src/SchedulerFeatureFlags'); |
| 61 | |
| 62 | const www = global.__WWW__ === true; |
| 63 | const xplat = global.__XPLAT__ === true; |
| 64 | const releaseChannel = www |
| 65 | ? __EXPERIMENTAL__ |
| 66 | ? 'modern' |
| 67 | : 'classic' |
| 68 | : __EXPERIMENTAL__ |
| 69 | ? 'experimental' |
| 70 | : 'stable'; |
| 71 | |
| 72 | // Return a proxy so we can throw if you attempt to access a flag that |
| 73 | // doesn't exist. |
| 74 | return new Proxy( |
| 75 | { |
| 76 | channel: releaseChannel, |
| 77 | modern: releaseChannel === 'modern', |
| 78 | classic: releaseChannel === 'classic', |
| 79 | source: !process.env.IS_BUILD, |
| 80 | www, |
| 81 | fb: www || xplat, |
| 82 | |
| 83 | // These aren't flags, just a useful aliases for tests. |
| 84 | // TODO: Clean this up. |
| 85 | enableActivity: true, |
| 86 | enableSuspenseList: releaseChannel === 'experimental' || www || xplat, |
| 87 | enableLegacyHidden: www, |
| 88 | // TODO: Suspending the work loop during the render phase is currently |
| 89 | // not compatible with sibling prerendering. We will add this optimization |
| 90 | // back in a later step. |
| 91 | enableSuspendingDuringWorkLoop: false, |
| 92 | |
| 93 | // This flag is used to determine whether we should run Fizz tests using |
| 94 | // the external runtime or the inline script runtime. |
| 95 | // For Meta we use variant to gate the feature. For OSS we use experimental |
| 96 | shouldUseFizzExternalRuntime: !featureFlags.enableFizzExternalRuntime |
| 97 | ? false |
| 98 | : www |
| 99 | ? __VARIANT__ |
| 100 | : __EXPERIMENTAL__, |
| 101 | |
| 102 | // This is used by useSyncExternalStoresShared-test.js to decide whether |
| 103 | // to test the shim or the native implementation of useSES. |
| 104 | |
| 105 | enableUseSyncExternalStoreShim: !__VARIANT__, |
| 106 | |
| 107 | // If there's a naming conflict between scheduler and React feature flags, the |
| 108 | // React ones take precedence. |
| 109 | // TODO: Maybe we should error on conflicts? Or we could namespace |
| 110 | // the flags |
| 111 | ...schedulerFeatureFlags, |
| 112 | ...featureFlags, |
| 113 | ...environmentFlags, |
no outgoing calls
no test coverage detected