refactor: Add `background` Redux slice as proxy for unflattened background state#29694

Draft

MajorLift wants to merge 61 commits intomainfrom jongsun/perf/redux/2501141-add-background-redux-slice

+1,407-708

Commits on Jan 14, 2025

Remove getFlatState method from ComposableObservableStore
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Define types for metamask controller store fields
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Refactor MetamaskController store, memStore fields so that they are assigned composed controller state objects
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Update PatchStore class to conform with new state types
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Fix errors in MetamaskController store objects and types
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Fix import paths
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Simply PatchStore._generatePatches
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Update App{State,Metadata}Controller entries in store objects/types to use state properties
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Move metamask-controllers types to shared directory
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Remove NotificationController from MetamaskController and store
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Define BackgroundStateProxy type and replace MemStoreControllersComposedState usage
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Add eslint-disable for no-restricted-paths in types file
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Optimize PatchStore to utilize controllerKey payload from stateChange listener and avoid iterating through entire metamask slice for every background state update
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Fix sanitizeUIState with in property checks
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Update and fix store, memStore
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Fix broken import for BalancesControllerState
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Convert ComposableObservableStore to TypeScript
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Fix all type errors in ComposableObservableStore
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Allow PatchStore to handle top-level keys that aren't controllerKeys for testing
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Fix implicit any in institutional store types
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refactor: ComposableObservableStore takes a controller map as input and exposes their composed state via .getState()
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Fix BridgeControllerState import path
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Remove ui/selectors/institutional/selectors.ts from diff
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Refactor sanitizeUIState so it can handle both the entire background state and individual controller states as input
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Fix PatchStore to handle individual controller state only and not updates to the entire background state or top-level non-object properties of background state
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Fix Redux store actions updateMetamaskState, applyPatches to ensure it can handle the unflattened background state
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Handle more edge cases in null check for controller.store.subscribe
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Add variable assignment
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Convert ComposableObservableStore.test.{j,t}s
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Remove incorrect return type on sanitizeUIState
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Fix tests for PatchStore, sanitizeUiState
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Fix tests for ComposableObservableStore
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Linter fixes
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Temporary adjustment for Bridge{,Status}ControllerState types
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Move initialMetamaskState into ui/ducks/metamask/constants.ts
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Remove TemporaryBackgroundState type and merge into initialMetamaskState for inference of metamask slice type
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Merge MetamaskState defined in metametrics-controller into initialMetamaskState
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Convert to TypeScript: combineReducer, metamask slice
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Unflatten metamask slice and convert to TypeScript
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Replace CombinedBackgroundAndReduxState type with fixed MetaMaskReduxState type
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Remove unused import
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Unflatten SENTRY_UI_STATE object
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Add missing PreferencesController.preferences properties to SENTRY_BACKGROUND_STATE
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Reduce diffs
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Rename MetamaskSliceState to MetaMaskSliceState
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Unflatten metametrics-controller
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Update type in updateMetamaskState
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Rename: shared/types/{metamask,background}.ts
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Commits on Jan 16, 2025

Revert metamask slice to flattened shape and create new unflattened slice at ui/ducks/background
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Commits on Jan 26, 2025

Commits on Jan 27, 2025

Commits on Jan 29, 2025

Remove build-mmi feature flag-wrapped code
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Commits on Jan 31, 2025