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Flarnie Marchan
1e3cd332a0
* Remove the 'alwaysUseRequestIdleCallbackPolyfill' feature flag **what is the change?:** Removes the feature flag 'alwaysUseRequestIdleCallbackPolyfill', such that we **always** use the polyfill for requestIdleCallback. **why make this change?:** We have been testing this feature flag at 100% for some time internally, and determined it works better for React than the native implementation. Looks like RN was overriding the flag to use the native when possible, but since no RN products are using 'async' mode it should be safe to switch this flag over for RN as well. **test plan:** We have already been testing this internally for some time. **issue:** internal task t28128480 * fix mistaken conditional * Add mocking of rAF, postMessage, and initial test for ReactScheduler **what is the change?:** - In all tests where we previously mocked rIC or relied on native mocking which no longer works, we are now mocking rAF and postMessage. - Also adds a basic initial test for ReactScheduler. NOTE -> we do plan to write headless browser tests for ReactScheduler! This is just an initial test, to verify that it works with the mocked out browser APIs as expected. **why make this change?:** We need to mock out the browser APIs more completely for the new 'ReactScheduler' to work in our tests. Many tests are depending on it, since it's used at a low level. By mocking the browser APIs rather than the 'react-scheduler' module, we enable testing the production bundles. This approach is trading isolation for accuracy. These tests will be closer to a real use. **test plan:** run the tests :) **issue:** internal task T28128480