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prefer-const lint rules (#18451)","authoredAt":"2020-04-01T12:35:52-07:00","authorName":"Sebastian Markbåge","revision":"3e94bce765d355d74f6a60feb4addb6d196e3482"},"patch":"diff --git a\/.eslintrc.js b\/.eslintrc.js\nindex 9f459489f0..af9d3de041 100644\n--- a\/.eslintrc.js\n+++ b\/.eslintrc.js\n@@ -126,6 +126,7 @@ module.exports = {\n },\n rules: {\n 'no-var': ERROR,\n+ 'prefer-const': ERROR,\n strict: OFF,\n },\n },\ndiff --git a\/packages\/babel-plugin-react-jsx\/src\/TransformJSXToReactBabelPlugin.js b\/packages\/babel-plugin-react-jsx\/src\/TransformJSXToReactBabelPlugin.js\nindex 2d8ebc8c6e..aaea6a229b 100644\n--- a\/packages\/babel-plugin-react-jsx\/src\/TransformJSXToReactBabelPlugin.js\n+++ b\/packages\/babel-plugin-react-jsx\/src\/TransformJSXToReactBabelPlugin.js\n@@ -115,7 +115,7 @@ You can turn on the 'throwIfNamespace' flag to bypass this warning.`,\n 'Fragment tags are only supported in React 16 and up.',\n );\n }\n- let callExpr = buildJSXFragmentCall(path, file);\n+ const callExpr = buildJSXFragmentCall(path, file);\n \n if (callExpr) {\n path.replaceWith(t.inherits(callExpr, path.node));\ndiff --git a\/packages\/eslint-plugin-react-hooks\/src\/ExhaustiveDeps.js b\/packages\/eslint-plugin-react-hooks\/src\/ExhaustiveDeps.js\nindex b4bc461913..9e439da199 100644\n--- a\/packages\/eslint-plugin-react-hooks\/src\/ExhaustiveDeps.js\n+++ b\/packages\/eslint-plugin-react-hooks\/src\/ExhaustiveDeps.js\n@@ -62,10 +62,10 @@ export default {\n const scopeManager = context.getSourceCode().scopeManager;\n \n \/\/ Should be shared between visitors.\n- let setStateCallSites = new WeakMap();\n- let stateVariables = new WeakSet();\n- let staticKnownValueCache = new WeakMap();\n- let functionWithoutCapturedValueCache = new WeakMap();\n+ const setStateCallSites = new WeakMap();\n+ const stateVariables = new WeakSet();\n+ const staticKnownValueCache = new WeakMap();\n+ const functionWithoutCapturedValueCache = new WeakMap();\n function memoizeWithWeakMap(fn, map) {\n return function(arg) {\n if (map.has(arg)) {\n@@ -400,12 +400,12 @@ export default {\n \/\/ Search the direct component subscopes for\n \/\/ top-level function definitions matching this reference.\n const fnNode = def.node;\n- let childScopes = componentScope.childScopes;\n+ const childScopes = componentScope.childScopes;\n let fnScope = null;\n let i;\n for (i = 0; i < childScopes.length; i++) {\n- let childScope = childScopes[i];\n- let childScopeBlock = childScope.block;\n+ const childScope = childScopes[i];\n+ const childScopeBlock = childScope.block;\n if (\n \/\/ function handleChange() {}\n (fnNode.type === 'FunctionDeclaration' &&\n@@ -597,7 +597,7 @@ export default {\n \n \/\/ Warn about assigning to variables in the outer scope.\n \/\/ Those are usually bugs.\n- let staleAssignments = new Set();\n+ const staleAssignments = new Set();\n function reportStaleAssignment(writeExpr, key) {\n if (staleAssignments.has(key)) {\n return;\n@@ -664,7 +664,7 @@ export default {\n });\n });\n if (setStateInsideEffectWithoutDeps) {\n- let {suggestedDependencies} = collectRecommendations({\n+ const {suggestedDependencies} = collectRecommendations({\n dependencies,\n declaredDependencies: [],\n optionalDependencies,\n@@ -789,7 +789,7 @@ export default {\n });\n }\n \n- let {\n+ const {\n suggestedDependencies,\n unnecessaryDependencies,\n missingDependencies,\n@@ -802,6 +802,8 @@ export default {\n isEffect,\n });\n \n+ let suggestedDeps = suggestedDependencies;\n+\n const problemCount =\n duplicateDependencies.size +\n missingDependencies.size +\n@@ -871,7 +873,7 @@ export default {\n \/\/ for effects though because those have legit\n \/\/ use cases for over-specifying deps.\n if (!isEffect && missingDependencies.size > 0) {\n- suggestedDependencies = collectRecommendations({\n+ suggestedDeps = collectRecommendations({\n dependencies,\n declaredDependencies: [], \/\/ Pretend we don't know\n optionalDependencies,\n@@ -890,7 +892,7 @@ export default {\n return declaredDepKeys.join(',') === sortedDeclaredDepKeys.join(',');\n }\n if (areDeclaredDepsAlphabetized()) {\n- suggestedDependencies.sort();\n+ suggestedDeps.sort();\n }\n \n function getWarningMessage(deps, singlePrefix, label, fixVerb) {\n@@ -945,7 +947,7 @@ export default {\n \/\/ a `this` value. This warning can be confusing.\n \/\/ So if we're going to show it, append a clarification.\n if (!extraWarning && missingDependencies.has('props')) {\n- let propDep = dependencies.get('props');\n+ const propDep = dependencies.get('props');\n if (propDep == null) {\n return;\n }\n@@ -1146,14 +1148,14 @@ export default {\n extraWarning,\n suggest: [\n {\n- desc: `Update the dependencies array to be: [${suggestedDependencies.join(\n+ desc: `Update the dependencies array to be: [${suggestedDeps.join(\n ', ',\n )}]`,\n fix(fixer) {\n \/\/ TODO: consider preserving the comments or formatting?\n return fixer.replaceText(\n declaredDependenciesNode,\n- `[${suggestedDependencies.join(', ')}]`,\n+ `[${suggestedDeps.join(', ')}]`,\n );\n },\n },\n@@ -1213,9 +1215,9 @@ function collectRecommendations({\n \n \/\/ Tree manipulation helpers.\n function getOrCreateNodeByPath(rootNode, path) {\n- let keys = path.split('.');\n+ const keys = path.split('.');\n let node = rootNode;\n- for (let key of keys) {\n+ for (const key of keys) {\n let child = node.children.get(key);\n if (!child) {\n child = createDepTree();\n@@ -1226,10 +1228,10 @@ function collectRecommendations({\n return node;\n }\n function markAllParentsByPath(rootNode, path, fn) {\n- let keys = path.split('.');\n+ const keys = path.split('.');\n let node = rootNode;\n- for (let key of keys) {\n- let child = node.children.get(key);\n+ for (const key of keys) {\n+ const child = node.children.get(key);\n if (!child) {\n return;\n }\n@@ -1239,8 +1241,8 @@ function collectRecommendations({\n }\n \n \/\/ Now we can learn which dependencies are missing or necessary.\n- let missingDependencies = new Set();\n- let satisfyingDependencies = new Set();\n+ const missingDependencies = new Set();\n+ const satisfyingDependencies = new Set();\n scanTreeRecursively(\n depTree,\n missingDependencies,\n@@ -1277,9 +1279,9 @@ function collectRecommendations({\n }\n \n \/\/ Collect suggestions in the order they were originally specified.\n- let suggestedDependencies = [];\n- let unnecessaryDependencies = new Set();\n- let duplicateDependencies = new Set();\n+ const suggestedDependencies = [];\n+ const unnecessaryDependencies = new Set();\n+ const duplicateDependencies = new Set();\n declaredDependencies.forEach(({key}) => {\n \/\/ Does this declared dep satisfy a real need?\n if (satisfyingDependencies.has(key)) {\n@@ -1337,7 +1339,7 @@ function scanForDeclaredBareFunctions({\n if (fnRef == null) {\n return null;\n }\n- let fnNode = fnRef.defs[0];\n+ const fnNode = fnRef.defs[0];\n if (fnNode == null) {\n return null;\n }\n@@ -1461,7 +1463,7 @@ function getNodeWithoutReactNamespace(node, options) {\n \/\/ 1 for useImperativeHandle(ref, fn).\n \/\/ For additionally configured Hooks, assume that they're like useEffect (0).\n function getReactiveHookCallbackIndex(calleeNode, options) {\n- let node = getNodeWithoutReactNamespace(calleeNode);\n+ const node = getNodeWithoutReactNamespace(calleeNode);\n if (node.type !== 'Identifier') {\n return -1;\n }\n@@ -1507,7 +1509,7 @@ function getReactiveHookCallbackIndex(calleeNode, options) {\n * - agnostic to AST node types, it looks for `{ type: string, ... }`\n *\/\n function fastFindReferenceWithParent(start, target) {\n- let queue = [start];\n+ const queue = [start];\n let item = null;\n \n while (queue.length) {\n@@ -1521,7 +1523,7 @@ function fastFindReferenceWithParent(start, target) {\n continue;\n }\n \n- for (let [key, value] of Object.entries(item)) {\n+ for (const [key, value] of Object.entries(item)) {\n if (key === 'parent') {\n continue;\n }\ndiff --git a\/packages\/eslint-plugin-react-hooks\/src\/RulesOfHooks.js b\/packages\/eslint-plugin-react-hooks\/src\/RulesOfHooks.js\nindex c5b2e73f83..db4d16582b 100644\n--- a\/packages\/eslint-plugin-react-hooks\/src\/RulesOfHooks.js\n+++ b\/packages\/eslint-plugin-react-hooks\/src\/RulesOfHooks.js\n@@ -226,7 +226,7 @@ export default {\n function countPathsToEnd(segment, pathHistory) {\n const {cache} = countPathsToEnd;\n let paths = cache.get(segment.id);\n- let pathList = new Set(pathHistory);\n+ const pathList = new Set(pathHistory);\n \n \/\/ If `pathList` includes the current segment then we've found a cycle!\n \/\/ We need to fill `cyclic` with all segments inside cycle\ndiff --git a\/packages\/jest-react\/src\/JestReact.js b\/packages\/jest-react\/src\/JestReact.js\nindex 26d116a7f9..57790797b9 100644\n--- a\/packages\/jest-react\/src\/JestReact.js\n+++ b\/packages\/jest-react\/src\/JestReact.js\n@@ -99,7 +99,7 @@ function jsonChildrenToJSXChildren(jsonChildren) {\n if (jsonChildren.length === 1) {\n return jsonChildToJSXChild(jsonChildren[0]);\n } else if (jsonChildren.length > 1) {\n- let jsxChildren = [];\n+ const jsxChildren = [];\n let allJSXChildrenAreStrings = true;\n let jsxChildrenString = '';\n for (let i = 0; i < jsonChildren.length; i++) {\ndiff --git a\/packages\/legacy-events\/getListener.js b\/packages\/legacy-events\/getListener.js\nindex 8ef609c7b3..5be8ccceaf 100644\n--- a\/packages\/legacy-events\/getListener.js\n+++ b\/packages\/legacy-events\/getListener.js\n@@ -46,8 +46,6 @@ function shouldPreventMouseEvent(name, type, props) {\n * @return {?function} The stored callback.\n *\/\n export default function getListener(inst: Fiber, registrationName: string) {\n- let listener;\n-\n \/\/ TODO: shouldPreventMouseEvent is DOM-specific and definitely should not\n \/\/ live here; needs to be moved to a better place soon\n const stateNode = inst.stateNode;\n@@ -60,7 +58,7 @@ export default function getListener(inst: Fiber, registrationName: string) {\n \/\/ Work in progress.\n return null;\n }\n- listener = props[registrationName];\n+ const listener = props[registrationName];\n if (shouldPreventMouseEvent(registrationName, inst.type, props)) {\n return null;\n }\ndiff --git a\/packages\/react-art\/src\/ReactARTHostConfig.js b\/packages\/react-art\/src\/ReactARTHostConfig.js\nindex 28bbc236b1..1b010e0996 100644\n--- a\/packages\/react-art\/src\/ReactARTHostConfig.js\n+++ b\/packages\/react-art\/src\/ReactARTHostConfig.js\n@@ -68,7 +68,7 @@ function createEventHandler(instance) {\n \n function destroyEventListeners(instance) {\n if (instance._subscriptions) {\n- for (let type in instance._subscriptions) {\n+ for (const type in instance._subscriptions) {\n instance._subscriptions[type]();\n }\n }\n@@ -170,7 +170,7 @@ function applyNodeProps(instance, props, prevProps = {}) {\n }\n }\n \n- for (let type in EVENT_TYPES) {\n+ for (const type in EVENT_TYPES) {\n addEventListeners(instance, EVENT_TYPES[type], props[type]);\n }\n }\ndiff --git a\/packages\/react-cache\/src\/ReactCache.js b\/packages\/react-cache\/src\/ReactCache.js\nindex 16d516064b..577ec6bb1a 100644\n--- a\/packages\/react-cache\/src\/ReactCache.js\n+++ b\/packages\/react-cache\/src\/ReactCache.js\n@@ -97,7 +97,7 @@ function accessResult(\n entriesForResource = new Map();\n entries.set(resource, entriesForResource);\n }\n- let entry = entriesForResource.get(key);\n+ const entry = entriesForResource.get(key);\n if (entry === undefined) {\n const thenable = fetch(input);\n thenable.then(\ndiff --git a\/packages\/react-cache\/src\/__tests__\/ReactCache-test.internal.js b\/packages\/react-cache\/src\/__tests__\/ReactCache-test.internal.js\nindex 0a459fc9d3..24c3b3d390 100644\n--- a\/packages\/react-cache\/src\/__tests__\/ReactCache-test.internal.js\n+++ b\/packages\/react-cache\/src\/__tests__\/ReactCache-test.internal.js\n@@ -303,7 +303,7 @@ describe('ReactCache', () => {\n const BadTextResource = createResource(\n ([text, ms = 0]) => {\n let listeners = null;\n- let value = null;\n+ const value = null;\n return {\n then(resolve, reject) {\n if (value !== null) {\ndiff --git a\/packages\/react-client\/src\/ReactFlightClient.js b\/packages\/react-client\/src\/ReactFlightClient.js\nindex 6c22df48b0..14f4aaaa05 100644\n--- a\/packages\/react-client\/src\/ReactFlightClient.js\n+++ b\/packages\/react-client\/src\/ReactFlightClient.js\n@@ -62,7 +62,7 @@ function Chunk(status: any, value: any) {\n this._value = value;\n }\n Chunk.prototype.then = function(resolve: () => mixed) {\n- let chunk: SomeChunk = this;\n+ const chunk: SomeChunk = this;\n if (chunk._status === PENDING) {\n if (chunk._value === null) {\n chunk._value = [];\n@@ -81,8 +81,8 @@ export type Response = {\n };\n \n function readRoot(): T {\n- let response: Response = this;\n- let rootChunk = response.rootChunk;\n+ const response: Response = this;\n+ const rootChunk = response.rootChunk;\n if (rootChunk._status === RESOLVED) {\n return rootChunk._value;\n } else if (rootChunk._status === PENDING) {\n@@ -94,10 +94,10 @@ function readRoot(): T {\n }\n \n export function createResponse(): Response {\n- let rootChunk: SomeChunk = createPendingChunk();\n- let chunks: Map> = new Map();\n+ const rootChunk: SomeChunk = createPendingChunk();\n+ const chunks: Map> = new Map();\n chunks.set(0, rootChunk);\n- let response = {\n+ const response = {\n partialRow: '',\n rootChunk,\n chunks: chunks,\n@@ -117,7 +117,7 @@ function createErrorChunk(error: Error): ErroredChunk {\n function wakeChunk(listeners: null | Array<() => mixed>) {\n if (listeners !== null) {\n for (let i = 0; i < listeners.length; i++) {\n- let listener = listeners[i];\n+ const listener = listeners[i];\n listener();\n }\n }\n@@ -128,8 +128,8 @@ function triggerErrorOnChunk(chunk: SomeChunk, error: Error): void {\n \/\/ We already resolved. We didn't expect to see this.\n return;\n }\n- let listeners = chunk._value;\n- let erroredChunk: ErroredChunk = (chunk: any);\n+ const listeners = chunk._value;\n+ const erroredChunk: ErroredChunk = (chunk: any);\n erroredChunk._status = ERRORED;\n erroredChunk._value = error;\n wakeChunk(listeners);\n@@ -144,8 +144,8 @@ function resolveChunk(chunk: SomeChunk, value: T): void {\n \/\/ We already resolved. We didn't expect to see this.\n return;\n }\n- let listeners = chunk._value;\n- let resolvedChunk: ResolvedChunk = (chunk: any);\n+ const listeners = chunk._value;\n+ const resolvedChunk: ResolvedChunk = (chunk: any);\n resolvedChunk._status = RESOLVED;\n resolvedChunk._value = value;\n wakeChunk(listeners);\n@@ -170,7 +170,7 @@ function readMaybeChunk(maybeChunk: SomeChunk | T): T {\n \/\/ $FlowFixMe\n return maybeChunk;\n }\n- let chunk: SomeChunk = (maybeChunk: any);\n+ const chunk: SomeChunk = (maybeChunk: any);\n if (chunk._status === RESOLVED) {\n return chunk._value;\n } else if (chunk._status === PENDING) {\n@@ -232,18 +232,18 @@ function initializeBlock(\n tuple: UninitializedBlockPayload,\n ): BlockComponent {\n \/\/ Require module first and then data. The ordering matters.\n- let moduleMetaData: ModuleMetaData = readMaybeChunk(tuple[1]);\n- let moduleReference: ModuleReference<\n+ const moduleMetaData: ModuleMetaData = readMaybeChunk(tuple[1]);\n+ const moduleReference: ModuleReference<\n BlockRenderFunction,\n > = resolveModuleReference(moduleMetaData);\n \/\/ TODO: Do this earlier, as the chunk is resolved.\n preloadModule(moduleReference);\n \n- let moduleExport = requireModule(moduleReference);\n+ const moduleExport = requireModule(moduleReference);\n \n \/\/ The ordering here is important because this call might suspend.\n \/\/ We don't want that to prevent the module graph for being initialized.\n- let data: Data = readMaybeChunk(tuple[2]);\n+ const data: Data = readMaybeChunk(tuple[2]);\n \n return {\n $$typeof: REACT_BLOCK_TYPE,\n@@ -256,7 +256,7 @@ function initializeBlock(\n function createLazyBlock(\n tuple: UninitializedBlockPayload,\n ): LazyComponent, UninitializedBlockPayload> {\n- let lazyType: LazyComponent<\n+ const lazyType: LazyComponent<\n BlockComponent,\n UninitializedBlockPayload,\n > = {\n@@ -281,8 +281,8 @@ export function parseModelFromJSON(\n \/\/ This was an escaped string value.\n return value.substring(1);\n } else {\n- let id = parseInt(value.substring(1), 16);\n- let chunks = response.chunks;\n+ const id = parseInt(value.substring(1), 16);\n+ const chunks = response.chunks;\n let chunk = chunks.get(id);\n if (!chunk) {\n chunk = createPendingChunk();\n@@ -296,7 +296,7 @@ export function parseModelFromJSON(\n }\n }\n if (typeof value === 'object' && value !== null) {\n- let tuple: [mixed, mixed, mixed, mixed] = (value: any);\n+ const tuple: [mixed, mixed, mixed, mixed] = (value: any);\n switch (tuple[0]) {\n case REACT_ELEMENT_TYPE: {\n \/\/ TODO: Consider having React just directly accept these arrays as elements.\n@@ -317,8 +317,8 @@ export function resolveModelChunk(\n id: number,\n model: M,\n ): void {\n- let chunks = response.chunks;\n- let chunk = chunks.get(id);\n+ const chunks = response.chunks;\n+ const chunk = chunks.get(id);\n if (!chunk) {\n chunks.set(id, createResolvedChunk(model));\n } else {\n@@ -332,10 +332,10 @@ export function resolveErrorChunk(\n message: string,\n stack: string,\n ): void {\n- let error = new Error(message);\n+ const error = new Error(message);\n error.stack = stack;\n- let chunks = response.chunks;\n- let chunk = chunks.get(id);\n+ const chunks = response.chunks;\n+ const chunk = chunks.get(id);\n if (!chunk) {\n chunks.set(id, createErrorChunk(error));\n } else {\ndiff --git a\/packages\/react-client\/src\/ReactFlightClientStream.js b\/packages\/react-client\/src\/ReactFlightClientStream.js\nindex b7fc86469f..2753814b7e 100644\n--- a\/packages\/react-client\/src\/ReactFlightClientStream.js\n+++ b\/packages\/react-client\/src\/ReactFlightClientStream.js\n@@ -31,7 +31,7 @@ export type Response = ResponseBase & {\n };\n \n export function createResponse(): Response {\n- let response: Response = (createResponseImpl(): any);\n+ const response: Response = (createResponseImpl(): any);\n response.fromJSON = function(key: string, value: JSONValue) {\n return parseModelFromJSON(response, this, key, value);\n };\n@@ -45,27 +45,27 @@ function processFullRow(response: Response, row: string): void {\n if (row === '') {\n return;\n }\n- let tag = row[0];\n+ const tag = row[0];\n switch (tag) {\n case 'J': {\n- let colon = row.indexOf(':', 1);\n- let id = parseInt(row.substring(1, colon), 16);\n- let json = row.substring(colon + 1);\n- let model = JSON.parse(json, response.fromJSON);\n+ const colon = row.indexOf(':', 1);\n+ const id = parseInt(row.substring(1, colon), 16);\n+ const json = row.substring(colon + 1);\n+ const model = JSON.parse(json, response.fromJSON);\n resolveModelChunk(response, id, model);\n return;\n }\n case 'E': {\n- let colon = row.indexOf(':', 1);\n- let id = parseInt(row.substring(1, colon), 16);\n- let json = row.substring(colon + 1);\n- let errorInfo = JSON.parse(json);\n+ const colon = row.indexOf(':', 1);\n+ const id = parseInt(row.substring(1, colon), 16);\n+ const json = row.substring(colon + 1);\n+ const errorInfo = JSON.parse(json);\n resolveErrorChunk(response, id, errorInfo.message, errorInfo.stack);\n return;\n }\n default: {\n \/\/ Assume this is the root model.\n- let model = JSON.parse(row, response.fromJSON);\n+ const model = JSON.parse(row, response.fromJSON);\n resolveModelChunk(response, 0, model);\n return;\n }\n@@ -79,7 +79,7 @@ export function processStringChunk(\n ): void {\n let linebreak = chunk.indexOf('\\n', offset);\n while (linebreak > -1) {\n- let fullrow = response.partialRow + chunk.substring(offset, linebreak);\n+ const fullrow = response.partialRow + chunk.substring(offset, linebreak);\n processFullRow(response, fullrow);\n response.partialRow = '';\n offset = linebreak + 1;\n@@ -95,10 +95,10 @@ export function processBinaryChunk(\n if (!supportsBinaryStreams) {\n throw new Error(\"This environment don't support binary chunks.\");\n }\n- let stringDecoder = response.stringDecoder;\n+ const stringDecoder = response.stringDecoder;\n let linebreak = chunk.indexOf(10); \/\/ newline\n while (linebreak > -1) {\n- let fullrow =\n+ const fullrow =\n response.partialRow +\n readFinalStringChunk(stringDecoder, chunk.subarray(0, linebreak));\n processFullRow(response, fullrow);\ndiff --git a\/packages\/react-client\/src\/__tests__\/ReactFlight-test.js b\/packages\/react-client\/src\/__tests__\/ReactFlight-test.js\nindex b390d0c07f..8e877ea101 100644\n--- a\/packages\/react-client\/src\/__tests__\/ReactFlight-test.js\n+++ b\/packages\/react-client\/src\/__tests__\/ReactFlight-test.js\n@@ -38,7 +38,7 @@ describe('ReactFlight', () => {\n };\n }\n return function(...args) {\n- let curriedLoad = () => {\n+ const curriedLoad = () => {\n return load(...args);\n };\n return ReactNoopFlightServerRuntime.serverBlock(render, curriedLoad);\n@@ -58,10 +58,10 @@ describe('ReactFlight', () => {\n ),\n };\n }\n- let transport = ReactNoopFlightServer.render({\n+ const transport = ReactNoopFlightServer.render({\n foo: ,\n });\n- let model = ReactNoopFlightClient.read(transport);\n+ const model = ReactNoopFlightClient.read(transport);\n expect(model).toEqual({\n foo: {\n bar: (\n@@ -84,16 +84,16 @@ describe('ReactFlight', () => {\n <\/span>\n );\n }\n- let loadUser = block(User);\n- let model = {\n+ const loadUser = block(User);\n+ const model = {\n User: loadUser('Seb', 'Smith'),\n };\n \n- let transport = ReactNoopFlightServer.render(model);\n+ const transport = ReactNoopFlightServer.render(model);\n \n act(() => {\n- let rootModel = ReactNoopFlightClient.read(transport);\n- let UserClient = rootModel.User;\n+ const rootModel = ReactNoopFlightClient.read(transport);\n+ const UserClient = rootModel.User;\n ReactNoop.render();\n });\n \n@@ -111,16 +111,16 @@ describe('ReactFlight', () => {\n <\/span>\n );\n }\n- let loadUser = block(User, load);\n- let model = {\n+ const loadUser = block(User, load);\n+ const model = {\n User: loadUser('Seb', 'Smith'),\n };\n \n- let transport = ReactNoopFlightServer.render(model);\n+ const transport = ReactNoopFlightServer.render(model);\n \n act(() => {\n- let rootModel = ReactNoopFlightClient.read(transport);\n- let UserClient = rootModel.User;\n+ const rootModel = ReactNoopFlightClient.read(transport);\n+ const UserClient = rootModel.User;\n ReactNoop.render();\n });\n \ndiff --git a\/packages\/react-debug-tools\/src\/ReactDebugHooks.js b\/packages\/react-debug-tools\/src\/ReactDebugHooks.js\nindex a338dd0526..1fab259eb1 100644\n--- a\/packages\/react-debug-tools\/src\/ReactDebugHooks.js\n+++ b\/packages\/react-debug-tools\/src\/ReactDebugHooks.js\n@@ -65,7 +65,7 @@ function getPrimitiveStackCache(): Map> {\n \/\/ This initializes a cache of all primitive hooks so that the top\n \/\/ most stack frames added by calling the primitive hook can be removed.\n if (primitiveStackCache === null) {\n- let cache = new Map();\n+ const cache = new Map();\n let readHookLog;\n try {\n \/\/ Use all hooks here to add them to the hook log.\n@@ -94,7 +94,7 @@ function getPrimitiveStackCache(): Map> {\n hookLog = [];\n }\n for (let i = 0; i < readHookLog.length; i++) {\n- let hook = readHookLog[i];\n+ const hook = readHookLog[i];\n cache.set(hook.primitive, ErrorStackParser.parse(hook.stackError));\n }\n primitiveStackCache = cache;\n@@ -104,7 +104,7 @@ function getPrimitiveStackCache(): Map> {\n \n let currentHook: null | Hook = null;\n function nextHook(): null | Hook {\n- let hook = currentHook;\n+ const hook = currentHook;\n if (hook !== null) {\n currentHook = hook.next;\n }\n@@ -134,8 +134,8 @@ function useContext(\n function useState(\n initialState: (() => S) | S,\n ): [S, Dispatch>] {\n- let hook = nextHook();\n- let state: S =\n+ const hook = nextHook();\n+ const state: S =\n hook !== null\n ? hook.memoizedState\n : typeof initialState === 'function'\n@@ -151,7 +151,7 @@ function useReducer(\n initialArg: I,\n init?: I => S,\n ): [S, Dispatch] {\n- let hook = nextHook();\n+ const hook = nextHook();\n let state;\n if (hook !== null) {\n state = hook.memoizedState;\n@@ -167,8 +167,8 @@ function useReducer(\n }\n \n function useRef(initialValue: T): {|current: T|} {\n- let hook = nextHook();\n- let ref = hook !== null ? hook.memoizedState : {current: initialValue};\n+ const hook = nextHook();\n+ const ref = hook !== null ? hook.memoizedState : {current: initialValue};\n hookLog.push({\n primitive: 'Ref',\n stackError: new Error(),\n@@ -227,7 +227,7 @@ function useDebugValue(value: any, formatterFn: ?(value: any) => any) {\n }\n \n function useCallback(callback: T, inputs: Array | void | null): T {\n- let hook = nextHook();\n+ const hook = nextHook();\n hookLog.push({\n primitive: 'Callback',\n stackError: new Error(),\n@@ -240,8 +240,8 @@ function useMemo(\n nextCreate: () => T,\n inputs: Array | void | null,\n ): T {\n- let hook = nextHook();\n- let value = hook !== null ? hook.memoizedState[0] : nextCreate();\n+ const hook = nextHook();\n+ const value = hook !== null ? hook.memoizedState[0] : nextCreate();\n hookLog.push({primitive: 'Memo', stackError: new Error(), value});\n return value;\n }\n@@ -367,7 +367,7 @@ export type HooksTree = Array;\n let mostLikelyAncestorIndex = 0;\n \n function findSharedIndex(hookStack, rootStack, rootIndex) {\n- let source = rootStack[rootIndex].source;\n+ const source = rootStack[rootIndex].source;\n hookSearch: for (let i = 0; i < hookStack.length; i++) {\n if (hookStack[i].source === source) {\n \/\/ This looks like a match. Validate that the rest of both stack match up.\n@@ -412,7 +412,7 @@ function isReactWrapper(functionName, primitiveName) {\n if (!functionName) {\n return false;\n }\n- let expectedPrimitiveName = 'use' + primitiveName;\n+ const expectedPrimitiveName = 'use' + primitiveName;\n if (functionName.length < expectedPrimitiveName.length) {\n return false;\n }\n@@ -423,8 +423,8 @@ function isReactWrapper(functionName, primitiveName) {\n }\n \n function findPrimitiveIndex(hookStack, hook) {\n- let stackCache = getPrimitiveStackCache();\n- let primitiveStack = stackCache.get(hook.primitive);\n+ const stackCache = getPrimitiveStackCache();\n+ const primitiveStack = stackCache.get(hook.primitive);\n if (primitiveStack === undefined) {\n return -1;\n }\n@@ -453,9 +453,9 @@ function findPrimitiveIndex(hookStack, hook) {\n function parseTrimmedStack(rootStack, hook) {\n \/\/ Get the stack trace between the primitive hook function and\n \/\/ the root function call. I.e. the stack frames of custom hooks.\n- let hookStack = ErrorStackParser.parse(hook.stackError);\n- let rootIndex = findCommonAncestorIndex(rootStack, hookStack);\n- let primitiveIndex = findPrimitiveIndex(hookStack, hook);\n+ const hookStack = ErrorStackParser.parse(hook.stackError);\n+ const rootIndex = findCommonAncestorIndex(rootStack, hookStack);\n+ const primitiveIndex = findPrimitiveIndex(hookStack, hook);\n if (\n rootIndex === -1 ||\n primitiveIndex === -1 ||\n@@ -482,14 +482,14 @@ function parseCustomHookName(functionName: void | string): string {\n }\n \n function buildTree(rootStack, readHookLog): HooksTree {\n- let rootChildren = [];\n+ const rootChildren = [];\n let prevStack = null;\n let levelChildren = rootChildren;\n let nativeHookID = 0;\n- let stackOfChildren = [];\n+ const stackOfChildren = [];\n for (let i = 0; i < readHookLog.length; i++) {\n- let hook = readHookLog[i];\n- let stack = parseTrimmedStack(rootStack, hook);\n+ const hook = readHookLog[i];\n+ const stack = parseTrimmedStack(rootStack, hook);\n if (stack !== null) {\n \/\/ Note: The indices 0 <= n < length-1 will contain the names.\n \/\/ The indices 1 <= n < length will contain the source locations.\n@@ -499,8 +499,9 @@ function buildTree(rootStack, readHookLog): HooksTree {\n if (prevStack !== null) {\n \/\/ Compare the current level's stack to the new stack.\n while (commonSteps < stack.length && commonSteps < prevStack.length) {\n- let stackSource = stack[stack.length - commonSteps - 1].source;\n- let prevSource = prevStack[prevStack.length - commonSteps - 1].source;\n+ const stackSource = stack[stack.length - commonSteps - 1].source;\n+ const prevSource =\n+ prevStack[prevStack.length - commonSteps - 1].source;\n if (stackSource !== prevSource) {\n break;\n }\n@@ -514,7 +515,7 @@ function buildTree(rootStack, readHookLog): HooksTree {\n \/\/ The remaining part of the new stack are custom hooks. Push them\n \/\/ to the tree.\n for (let j = stack.length - commonSteps - 1; j >= 1; j--) {\n- let children = [];\n+ const children = [];\n levelChildren.push({\n id: null,\n isStateEditable: false,\n@@ -563,7 +564,7 @@ function processDebugValues(\n hooksTree: HooksTree,\n parentHooksNode: HooksNode | null,\n ): void {\n- let debugValueHooksNodes: Array = [];\n+ const debugValueHooksNodes: Array = [];\n \n for (let i = 0; i < hooksTree.length; i++) {\n const hooksNode = hooksTree[i];\n@@ -599,7 +600,7 @@ export function inspectHooks(\n currentDispatcher = ReactSharedInternals.ReactCurrentDispatcher;\n }\n \n- let previousDispatcher = currentDispatcher.current;\n+ const previousDispatcher = currentDispatcher.current;\n let readHookLog;\n currentDispatcher.current = Dispatcher;\n let ancestorStackError;\n@@ -611,7 +612,7 @@ export function inspectHooks(\n hookLog = [];\n currentDispatcher.current = previousDispatcher;\n }\n- let rootStack = ErrorStackParser.parse(ancestorStackError);\n+ const rootStack = ErrorStackParser.parse(ancestorStackError);\n return buildTree(rootStack, readHookLog);\n }\n \n@@ -642,7 +643,7 @@ function inspectHooksOfForwardRef(\n ref: Ref,\n currentDispatcher: CurrentDispatcherRef,\n ): HooksTree {\n- let previousDispatcher = currentDispatcher.current;\n+ const previousDispatcher = currentDispatcher.current;\n let readHookLog;\n currentDispatcher.current = Dispatcher;\n let ancestorStackError;\n@@ -654,7 +655,7 @@ function inspectHooksOfForwardRef(\n hookLog = [];\n currentDispatcher.current = previousDispatcher;\n }\n- let rootStack = ErrorStackParser.parse(ancestorStackError);\n+ const rootStack = ErrorStackParser.parse(ancestorStackError);\n return buildTree(rootStack, readHookLog);\n }\n \n@@ -663,7 +664,7 @@ function resolveDefaultProps(Component, baseProps) {\n \/\/ Resolve default props. Taken from ReactElement\n const props = Object.assign({}, baseProps);\n const defaultProps = Component.defaultProps;\n- for (let propName in defaultProps) {\n+ for (const propName in defaultProps) {\n if (props[propName] === undefined) {\n props[propName] = defaultProps[propName];\n }\n@@ -695,7 +696,7 @@ export function inspectHooksOfFiber(\n }\n \/\/ Warm up the cache so that it doesn't consume the currentHook.\n getPrimitiveStackCache();\n- let type = fiber.type;\n+ const type = fiber.type;\n let props = fiber.memoizedProps;\n if (type !== fiber.elementType) {\n props = resolveDefaultProps(type, props);\n@@ -703,7 +704,7 @@ export function inspectHooksOfFiber(\n \/\/ Set up the current hook so that we can step through and read the\n \/\/ current state from them.\n currentHook = (fiber.memoizedState: Hook);\n- let contextMap = new Map();\n+ const contextMap = new Map();\n try {\n setupContexts(contextMap, fiber);\n if (fiber.tag === ForwardRef) {\ndiff --git a\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspection-test.internal.js b\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspection-test.internal.js\nindex b8617a76e9..326e3c39bf 100644\n--- a\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspection-test.internal.js\n+++ b\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspection-test.internal.js\n@@ -39,7 +39,7 @@ describe('ReactHooksInspection', () => {\n });\n return
Hello world<\/div>;\n }\n- let tree = ReactDebugTools.inspectHooks(Foo, {});\n+ const tree = ReactDebugTools.inspectHooks(Foo, {});\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -65,7 +65,7 @@ describe('ReactHooksInspection', () => {\n React.useEffect(effect);\n return
Hello world<\/div>;\n }\n- let tree = ReactDebugTools.inspectHooks(Foo, {});\n+ const tree = ReactDebugTools.inspectHooks(Foo, {});\n expect(tree).toEqual([\n {\n isStateEditable: false,\ndiff --git a\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspection-test.js b\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspection-test.js\nindex f1c54cdecb..49786ddfd8 100644\n--- a\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspection-test.js\n+++ b\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspection-test.js\n@@ -22,10 +22,10 @@ describe('ReactHooksInspection', () => {\n \n it('should inspect a simple useState hook', () => {\n function Foo(props) {\n- let [state] = React.useState('hello world');\n+ const [state] = React.useState('hello world');\n return
{state}<\/div>;\n }\n- let tree = ReactDebugTools.inspectHooks(Foo, {});\n+ const tree = ReactDebugTools.inspectHooks(Foo, {});\n expect(tree).toEqual([\n {\n isStateEditable: true,\n@@ -39,15 +39,15 @@ describe('ReactHooksInspection', () => {\n \n it('should inspect a simple custom hook', () => {\n function useCustom(value) {\n- let [state] = React.useState(value);\n+ const [state] = React.useState(value);\n React.useDebugValue('custom hook label');\n return state;\n }\n function Foo(props) {\n- let value = useCustom('hello world');\n+ const value = useCustom('hello world');\n return
{value}<\/div>;\n }\n- let tree = ReactDebugTools.inspectHooks(Foo, {});\n+ const tree = ReactDebugTools.inspectHooks(Foo, {});\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -70,20 +70,20 @@ describe('ReactHooksInspection', () => {\n it('should inspect a tree of multiple hooks', () => {\n function effect() {}\n function useCustom(value) {\n- let [state] = React.useState(value);\n+ const [state] = React.useState(value);\n React.useEffect(effect);\n return state;\n }\n function Foo(props) {\n- let value1 = useCustom('hello');\n- let value2 = useCustom('world');\n+ const value1 = useCustom('hello');\n+ const value2 = useCustom('world');\n return (\n
\n {value1} {value2}\n <\/div>\n );\n }\n- let tree = ReactDebugTools.inspectHooks(Foo, {});\n+ const tree = ReactDebugTools.inspectHooks(Foo, {});\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -135,30 +135,30 @@ describe('ReactHooksInspection', () => {\n it('should inspect a tree of multiple levels of hooks', () => {\n function effect() {}\n function useCustom(value) {\n- let [state] = React.useReducer((s, a) => s, value);\n+ const [state] = React.useReducer((s, a) => s, value);\n React.useEffect(effect);\n return state;\n }\n function useBar(value) {\n- let result = useCustom(value);\n+ const result = useCustom(value);\n React.useLayoutEffect(effect);\n return result;\n }\n function useBaz(value) {\n React.useLayoutEffect(effect);\n- let result = useCustom(value);\n+ const result = useCustom(value);\n return result;\n }\n function Foo(props) {\n- let value1 = useBar('hello');\n- let value2 = useBaz('world');\n+ const value1 = useBar('hello');\n+ const value2 = useBaz('world');\n return (\n
\n {value1} {value2}\n <\/div>\n );\n }\n- let tree = ReactDebugTools.inspectHooks(Foo, {});\n+ const tree = ReactDebugTools.inspectHooks(Foo, {});\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -238,12 +238,12 @@ describe('ReactHooksInspection', () => {\n });\n \n it('should inspect the default value using the useContext hook', () => {\n- let MyContext = React.createContext('default');\n+ const MyContext = React.createContext('default');\n function Foo(props) {\n- let value = React.useContext(MyContext);\n+ const value = React.useContext(MyContext);\n return
{value}<\/div>;\n }\n- let tree = ReactDebugTools.inspectHooks(Foo, {});\n+ const tree = ReactDebugTools.inspectHooks(Foo, {});\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -257,15 +257,15 @@ describe('ReactHooksInspection', () => {\n \n it('should support an injected dispatcher', () => {\n function Foo(props) {\n- let [state] = React.useState('hello world');\n+ const [state] = React.useState('hello world');\n return
{state}<\/div>;\n }\n \n- let initial = {};\n+ const initial = {};\n let current = initial;\n let getterCalls = 0;\n- let setterCalls = [];\n- let FakeDispatcherRef = {\n+ const setterCalls = [];\n+ const FakeDispatcherRef = {\n get current() {\n getterCalls++;\n return current;\n@@ -299,7 +299,7 @@ describe('ReactHooksInspection', () => {\n React.useDebugValue('this is invalid');\n return null;\n }\n- let tree = ReactDebugTools.inspectHooks(Foo, {});\n+ const tree = ReactDebugTools.inspectHooks(Foo, {});\n expect(tree).toHaveLength(0);\n });\n \n@@ -312,7 +312,7 @@ describe('ReactHooksInspection', () => {\n useCustom();\n return null;\n }\n- let tree = ReactDebugTools.inspectHooks(Foo, {});\n+ const tree = ReactDebugTools.inspectHooks(Foo, {});\n expect(tree).toEqual([\n {\n isStateEditable: false,\ndiff --git a\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspectionIntegration-test.js b\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspectionIntegration-test.js\nindex 8bece8f1ca..ef41b65426 100644\n--- a\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspectionIntegration-test.js\n+++ b\/packages\/react-debug-tools\/src\/__tests__\/ReactHooksInspectionIntegration-test.js\n@@ -27,17 +27,17 @@ describe('ReactHooksInspectionIntegration', () => {\n });\n \n it('should inspect the current state of useState hooks', () => {\n- let useState = React.useState;\n+ const useState = React.useState;\n function Foo(props) {\n- let [state1, setState1] = useState('hello');\n- let [state2, setState2] = useState('world');\n+ const [state1, setState1] = useState('hello');\n+ const [state2, setState2] = useState('world');\n return (\n
\n {state1} {state2}\n <\/div>\n );\n }\n- let renderer = ReactTestRenderer.create();\n+ const renderer = ReactTestRenderer.create();\n \n let childFiber = renderer.root.findByType(Foo)._currentFiber();\n let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n@@ -58,7 +58,7 @@ describe('ReactHooksInspectionIntegration', () => {\n },\n ]);\n \n- let {\n+ const {\n onMouseDown: setStateA,\n onMouseUp: setStateB,\n } = renderer.root.findByType('div').props;\n@@ -109,12 +109,12 @@ describe('ReactHooksInspectionIntegration', () => {\n });\n \n it('should inspect the current state of all stateful hooks', () => {\n- let outsideRef = React.createRef();\n+ const outsideRef = React.createRef();\n function effect() {}\n function Foo(props) {\n- let [state1, setState] = React.useState('a');\n- let [state2, dispatch] = React.useReducer((s, a) => a.value, 'b');\n- let ref = React.useRef('c');\n+ const [state1, setState] = React.useState('a');\n+ const [state2, dispatch] = React.useReducer((s, a) => a.value, 'b');\n+ const ref = React.useRef('c');\n \n React.useLayoutEffect(effect);\n React.useEffect(effect);\n@@ -139,7 +139,7 @@ describe('ReactHooksInspectionIntegration', () => {\n });\n ref.current = 'C';\n }\n- let memoizedUpdate = React.useCallback(update, []);\n+ const memoizedUpdate = React.useCallback(update, []);\n return (\n
\n {state1} {state2}\n@@ -153,7 +153,7 @@ describe('ReactHooksInspectionIntegration', () => {\n \n let childFiber = renderer.root.findByType(Foo)._currentFiber();\n \n- let {onClick: updateStates} = renderer.root.findByType('div').props;\n+ const {onClick: updateStates} = renderer.root.findByType('div').props;\n \n let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n@@ -269,18 +269,18 @@ describe('ReactHooksInspectionIntegration', () => {\n });\n \n it('should inspect the value of the current provider in useContext', () => {\n- let MyContext = React.createContext('default');\n+ const MyContext = React.createContext('default');\n function Foo(props) {\n- let value = React.useContext(MyContext);\n+ const value = React.useContext(MyContext);\n return
{value}<\/div>;\n }\n- let renderer = ReactTestRenderer.create(\n+ const renderer = ReactTestRenderer.create(\n \n \n <\/MyContext.Provider>,\n );\n- let childFiber = renderer.root.findByType(Foo)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const childFiber = renderer.root.findByType(Foo)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -293,16 +293,16 @@ describe('ReactHooksInspectionIntegration', () => {\n });\n \n it('should inspect forwardRef', () => {\n- let obj = function() {};\n- let Foo = React.forwardRef(function(props, ref) {\n+ const obj = function() {};\n+ const Foo = React.forwardRef(function(props, ref) {\n React.useImperativeHandle(ref, () => obj);\n return
;\n });\n- let ref = React.createRef();\n- let renderer = ReactTestRenderer.create();\n+ const ref = React.createRef();\n+ const renderer = ReactTestRenderer.create();\n \n- let childFiber = renderer.root.findByType(Foo)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const childFiber = renderer.root.findByType(Foo)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -316,14 +316,14 @@ describe('ReactHooksInspectionIntegration', () => {\n \n it('should inspect memo', () => {\n function InnerFoo(props) {\n- let [value] = React.useState('hello');\n+ const [value] = React.useState('hello');\n return
{value}<\/div>;\n }\n- let Foo = React.memo(InnerFoo);\n- let renderer = ReactTestRenderer.create();\n+ const Foo = React.memo(InnerFoo);\n+ const renderer = ReactTestRenderer.create();\n \/\/ TODO: Test renderer findByType is broken for memo. Have to search for the inner.\n- let childFiber = renderer.root.findByType(InnerFoo)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const childFiber = renderer.root.findByType(InnerFoo)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n isStateEditable: true,\n@@ -337,16 +337,16 @@ describe('ReactHooksInspectionIntegration', () => {\n \n it('should inspect custom hooks', () => {\n function useCustom() {\n- let [value] = React.useState('hello');\n+ const [value] = React.useState('hello');\n return value;\n }\n function Foo(props) {\n- let value = useCustom();\n+ const value = useCustom();\n return
{value}<\/div>;\n }\n- let renderer = ReactTestRenderer.create();\n- let childFiber = renderer.root.findByType(Foo)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const renderer = ReactTestRenderer.create();\n+ const childFiber = renderer.root.findByType(Foo)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -373,9 +373,9 @@ describe('ReactHooksInspectionIntegration', () => {\n const memoizedValue = React.useMemo(() => 'hello', []);\n return
{memoizedValue}<\/div>;\n }\n- let renderer = ReactTestRenderer.create();\n- let childFiber = renderer.root.findByType(Foo)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const renderer = ReactTestRenderer.create();\n+ const childFiber = renderer.root.findByType(Foo)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n id: 0,\n@@ -402,9 +402,9 @@ describe('ReactHooksInspectionIntegration', () => {\n const [state] = React.useState(() => 'hello', []);\n return
{state}<\/div>;\n }\n- let renderer = ReactTestRenderer.create();\n- let childFiber = renderer.root.findByType(Foo)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const renderer = ReactTestRenderer.create();\n+ const childFiber = renderer.root.findByType(Foo)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n id: 0,\n@@ -427,12 +427,12 @@ describe('ReactHooksInspectionIntegration', () => {\n describe('useDebugValue', () => {\n it('should support inspectable values for multiple custom hooks', () => {\n function useLabeledValue(label) {\n- let [value] = React.useState(label);\n+ const [value] = React.useState(label);\n React.useDebugValue(`custom label ${label}`);\n return value;\n }\n function useAnonymous(label) {\n- let [value] = React.useState(label);\n+ const [value] = React.useState(label);\n return value;\n }\n function Example() {\n@@ -442,9 +442,9 @@ describe('ReactHooksInspectionIntegration', () => {\n useLabeledValue('d');\n return null;\n }\n- let renderer = ReactTestRenderer.create();\n- let childFiber = renderer.root.findByType(Example)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const renderer = ReactTestRenderer.create();\n+ const childFiber = renderer.root.findByType(Example)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -514,9 +514,9 @@ describe('ReactHooksInspectionIntegration', () => {\n useOuter();\n return null;\n }\n- let renderer = ReactTestRenderer.create();\n- let childFiber = renderer.root.findByType(Example)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const renderer = ReactTestRenderer.create();\n+ const childFiber = renderer.root.findByType(Example)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -561,9 +561,9 @@ describe('ReactHooksInspectionIntegration', () => {\n useSingleLabelCustom('two');\n return null;\n }\n- let renderer = ReactTestRenderer.create();\n- let childFiber = renderer.root.findByType(Example)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const renderer = ReactTestRenderer.create();\n+ const childFiber = renderer.root.findByType(Example)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -618,9 +618,9 @@ describe('ReactHooksInspectionIntegration', () => {\n React.useDebugValue('this is invalid');\n return null;\n }\n- let renderer = ReactTestRenderer.create();\n- let childFiber = renderer.root.findByType(Example)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const renderer = ReactTestRenderer.create();\n+ const childFiber = renderer.root.findByType(Example)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toHaveLength(0);\n });\n \n@@ -633,9 +633,9 @@ describe('ReactHooksInspectionIntegration', () => {\n useCustom();\n return null;\n }\n- let renderer = ReactTestRenderer.create();\n- let childFiber = renderer.root.findByType(Example)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const renderer = ReactTestRenderer.create();\n+ const childFiber = renderer.root.findByType(Example)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n isStateEditable: false,\n@@ -657,10 +657,10 @@ describe('ReactHooksInspectionIntegration', () => {\n });\n \n it('should support defaultProps and lazy', async () => {\n- let Suspense = React.Suspense;\n+ const Suspense = React.Suspense;\n \n function Foo(props) {\n- let [value] = React.useState(props.defaultValue.substr(0, 3));\n+ const [value] = React.useState(props.defaultValue.substr(0, 3));\n return
{value}<\/div>;\n }\n Foo.defaultProps = {\n@@ -671,9 +671,9 @@ describe('ReactHooksInspectionIntegration', () => {\n return {default: result};\n }\n \n- let LazyFoo = React.lazy(() => fakeImport(Foo));\n+ const LazyFoo = React.lazy(() => fakeImport(Foo));\n \n- let renderer = ReactTestRenderer.create(\n+ const renderer = ReactTestRenderer.create(\n \n \n <\/Suspense>,\n@@ -683,8 +683,8 @@ describe('ReactHooksInspectionIntegration', () => {\n \n Scheduler.unstable_flushAll();\n \n- let childFiber = renderer.root._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const childFiber = renderer.root._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n isStateEditable: true,\n@@ -698,15 +698,15 @@ describe('ReactHooksInspectionIntegration', () => {\n \n it('should support an injected dispatcher', () => {\n function Foo(props) {\n- let [state] = React.useState('hello world');\n+ const [state] = React.useState('hello world');\n return
{state}<\/div>;\n }\n \n- let initial = {};\n+ const initial = {};\n let current = initial;\n let getterCalls = 0;\n- let setterCalls = [];\n- let FakeDispatcherRef = {\n+ const setterCalls = [];\n+ const FakeDispatcherRef = {\n get current() {\n getterCalls++;\n return current;\n@@ -717,8 +717,8 @@ describe('ReactHooksInspectionIntegration', () => {\n },\n };\n \n- let renderer = ReactTestRenderer.create();\n- let childFiber = renderer.root._currentFiber();\n+ const renderer = ReactTestRenderer.create();\n+ const childFiber = renderer.root._currentFiber();\n expect(() => {\n ReactDebugTools.inspectHooksOfFiber(childFiber, FakeDispatcherRef);\n }).toThrow(\n@@ -798,9 +798,9 @@ describe('ReactHooksInspectionIntegration', () => {\n React.useMemo(() => 'memo', []);\n return
;\n }\n- let renderer = ReactTestRenderer.create();\n- let childFiber = renderer.root.findByType(Foo)._currentFiber();\n- let tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n+ const renderer = ReactTestRenderer.create();\n+ const childFiber = renderer.root.findByType(Foo)._currentFiber();\n+ const tree = ReactDebugTools.inspectHooksOfFiber(childFiber);\n expect(tree).toEqual([\n {\n id: 0,\ndiff --git a\/packages\/react-devtools-core\/src\/editor.js b\/packages\/react-devtools-core\/src\/editor.js\nindex bbe3fa63d9..5d53cf9215 100644\n--- a\/packages\/react-devtools-core\/src\/editor.js\n+++ b\/packages\/react-devtools-core\/src\/editor.js\n@@ -156,11 +156,13 @@ export function launchEditor(\n return;\n }\n \n- let [editor, ...args] = guessEditor();\n+ const [editor, ...destructuredArgs] = guessEditor();\n if (!editor) {\n return;\n }\n \n+ let args = destructuredArgs;\n+\n if (lineNumber) {\n args = args.concat(getArgumentsForLineNumber(editor, filePath, lineNumber));\n } else {\ndiff --git a\/packages\/react-devtools-extensions\/src\/main.js b\/packages\/react-devtools-extensions\/src\/main.js\nindex 74144f3392..4416fe6b84 100644\n--- a\/packages\/react-devtools-extensions\/src\/main.js\n+++ b\/packages\/react-devtools-extensions\/src\/main.js\n@@ -228,11 +228,11 @@ function createPanelIfReactLoaded() {\n cloneStyleTags = () => {\n const linkTags = [];\n \/\/ eslint-disable-next-line no-for-of-loops\/no-for-of-loops\n- for (let linkTag of document.getElementsByTagName('link')) {\n+ for (const linkTag of document.getElementsByTagName('link')) {\n if (linkTag.rel === 'stylesheet') {\n const newLinkTag = document.createElement('link');\n \/\/ eslint-disable-next-line no-for-of-loops\/no-for-of-loops\n- for (let attribute of linkTag.attributes) {\n+ for (const attribute of linkTag.attributes) {\n newLinkTag.setAttribute(attribute.nodeName, attribute.nodeValue);\n }\n linkTags.push(newLinkTag);\ndiff --git a\/packages\/react-devtools-extensions\/src\/panel.js b\/packages\/react-devtools-extensions\/src\/panel.js\nindex de7d8a68fc..202b7cf4d6 100644\n--- a\/packages\/react-devtools-extensions\/src\/panel.js\n+++ b\/packages\/react-devtools-extensions\/src\/panel.js\n@@ -12,7 +12,7 @@ window.injectStyles = getLinkTags => {\n const linkTags = getLinkTags();\n \n \/\/ eslint-disable-next-line no-for-of-loops\/no-for-of-loops\n- for (let linkTag of linkTags) {\n+ for (const linkTag of linkTags) {\n document.head.appendChild(linkTag);\n }\n }\ndiff --git a\/packages\/react-devtools-shared\/src\/__tests__\/profilingCache-test.js b\/packages\/react-devtools-shared\/src\/__tests__\/profilingCache-test.js\nindex b26c8dbe68..149449b117 100644\n--- a\/packages\/react-devtools-shared\/src\/__tests__\/profilingCache-test.js\n+++ b\/packages\/react-devtools-shared\/src\/__tests__\/profilingCache-test.js\n@@ -72,7 +72,7 @@ describe('ProfilingCache', () => {\n utils.act(() => ReactDOM.render(, containerA));\n utils.act(() => store.profilerStore.stopProfiling());\n \n- let allProfilingDataForRoots = [];\n+ const allProfilingDataForRoots = [];\n \n function Validator({previousProfilingDataForRoot, rootID}) {\n const profilingDataForRoot = store.profilerStore.getDataForRoot(rootID);\ndiff --git a\/packages\/react-devtools-shared\/src\/__tests__\/storeStressSync-test.js b\/packages\/react-devtools-shared\/src\/__tests__\/storeStressSync-test.js\nindex 899979932f..587bef95af 100644\n--- a\/packages\/react-devtools-shared\/src\/__tests__\/storeStressSync-test.js\n+++ b\/packages\/react-devtools-shared\/src\/__tests__\/storeStressSync-test.js\n@@ -37,7 +37,7 @@ describe('StoreStress (Legacy Mode)', () => {\n \/\/ We'll be manually flipping this component back and forth in the test.\n \/\/ We only do this for a single node in order to verify that DevTools\n \/\/ can handle a subtree switching alternates while other subtrees are memoized.\n- let [showX, _setShowX] = React.useState(false);\n+ const [showX, _setShowX] = React.useState(false);\n setShowX = _setShowX;\n return showX ? : 'c';\n };\n@@ -87,7 +87,7 @@ describe('StoreStress (Legacy Mode)', () => {\n \/\/ These cases are picked so that rendering them sequentially in the same\n \/\/ container results in a combination of mounts, updates, unmounts, and reorders.\n \/\/ prettier-ignore\n- let cases = [\n+ const cases = [\n [a, b, c, d, e],\n [[a], b, c, d, e],\n [[a, b], c, d, e],\n@@ -183,7 +183,7 @@ describe('StoreStress (Legacy Mode)', () => {\n const e = ;\n \n \/\/ prettier-ignore\n- let steps = [\n+ const steps = [\n a,\n b,\n c,\n@@ -207,7 +207,7 @@ describe('StoreStress (Legacy Mode)', () => {\n };\n \n \/\/ 1. Capture the expected render result.\n- let snapshots = [];\n+ const snapshots = [];\n let container = document.createElement('div');\n for (let i = 0; i < steps.length; i++) {\n act(() => ReactDOM.render({steps[i]}<\/Root>, container));\n@@ -308,7 +308,7 @@ describe('StoreStress (Legacy Mode)', () => {\n \n \/\/ 1. For each step, check Suspense can render them as initial primary content.\n \/\/ This is the only step where we use Jest snapshots.\n- let snapshots = [];\n+ const snapshots = [];\n let container = document.createElement('div');\n for (let i = 0; i < steps.length; i++) {\n act(() =>\n@@ -719,7 +719,7 @@ describe('StoreStress (Legacy Mode)', () => {\n \n \/\/ 1. For each step, check Suspense can render them as initial primary content.\n \/\/ This is the only step where we use Jest snapshots.\n- let snapshots = [];\n+ const snapshots = [];\n let container = document.createElement('div');\n for (let i = 0; i < steps.length; i++) {\n act(() =>\n@@ -744,7 +744,7 @@ describe('StoreStress (Legacy Mode)', () => {\n \/\/ 2. Verify check Suspense can render same steps as initial fallback content.\n \/\/ We don't actually assert here because the tree includes \n \/\/ which is different from the snapshots above. So we take more snapshots.\n- let fallbackSnapshots = [];\n+ const fallbackSnapshots = [];\n for (let i = 0; i < steps.length; i++) {\n act(() =>\n ReactDOM.render(\ndiff --git a\/packages\/react-devtools-shared\/src\/__tests__\/storeStressTestConcurrent-test.js b\/packages\/react-devtools-shared\/src\/__tests__\/storeStressTestConcurrent-test.js\nindex fc4fe8bc1e..b972cf3177 100644\n--- a\/packages\/react-devtools-shared\/src\/__tests__\/storeStressTestConcurrent-test.js\n+++ b\/packages\/react-devtools-shared\/src\/__tests__\/storeStressTestConcurrent-test.js\n@@ -42,7 +42,7 @@ describe('StoreStressConcurrent', () => {\n \/\/ We'll be manually flipping this component back and forth in the test.\n \/\/ We only do this for a single node in order to verify that DevTools\n \/\/ can handle a subtree switching alternates while other subtrees are memoized.\n- let [showX, _setShowX] = React.useState(false);\n+ const [showX, _setShowX] = React.useState(false);\n setShowX = _setShowX;\n return showX ? : 'c';\n };\n@@ -115,7 +115,7 @@ describe('StoreStressConcurrent', () => {\n \/\/ These cases are picked so that rendering them sequentially in the same\n \/\/ container results in a combination of mounts, updates, unmounts, and reorders.\n \/\/ prettier-ignore\n- let cases = [\n+ const cases = [\n [a, b, c, d, e],\n [[a], b, c, d, e],\n [[a, b], c, d, e],\n@@ -215,7 +215,7 @@ describe('StoreStressConcurrent', () => {\n const e = ;\n \n \/\/ prettier-ignore\n- let steps = [\n+ const steps = [\n a,\n b,\n c,\n@@ -239,7 +239,7 @@ describe('StoreStressConcurrent', () => {\n };\n \n \/\/ 1. Capture the expected render result.\n- let snapshots = [];\n+ const snapshots = [];\n let container = document.createElement('div');\n \/\/ $FlowFixMe\n let root = ReactDOM.createRoot(container);\n@@ -401,7 +401,7 @@ describe('StoreStressConcurrent', () => {\n \n \/\/ 1. For each step, check Suspense can render them as initial primary content.\n \/\/ This is the only step where we use Jest snapshots.\n- let snapshots = [];\n+ const snapshots = [];\n let container = document.createElement('div');\n \/\/ $FlowFixMe\n let root = ReactDOM.createRoot(container);\n@@ -890,7 +890,7 @@ describe('StoreStressConcurrent', () => {\n \n \/\/ 1. For each step, check Suspense can render them as initial primary content.\n \/\/ This is the only step where we use Jest snapshots.\n- let snapshots = [];\n+ const snapshots = [];\n let container = document.createElement('div');\n \/\/ $FlowFixMe\n let root = ReactDOM.createRoot(container);\n@@ -915,7 +915,7 @@ describe('StoreStressConcurrent', () => {\n \/\/ 2. Verify check Suspense can render same steps as initial fallback content.\n \/\/ We don't actually assert here because the tree includes \n \/\/ which is different from the snapshots above. So we take more snapshots.\n- let fallbackSnapshots = [];\n+ const fallbackSnapshots = [];\n for (let i = 0; i < steps.length; i++) {\n act(() =>\n root.render(\ndiff --git a\/packages\/react-devtools-shared\/src\/__tests__\/treeContext-test.js b\/packages\/react-devtools-shared\/src\/__tests__\/treeContext-test.js\nindex 67e7ddf01a..b42fb0a9b6 100644\n--- a\/packages\/react-devtools-shared\/src\/__tests__\/treeContext-test.js\n+++ b\/packages\/react-devtools-shared\/src\/__tests__\/treeContext-test.js\n@@ -482,7 +482,7 @@ describe('TreeListContext', () => {\n utils.act(() => (renderer = TestRenderer.create()));\n expect(state).toMatchSnapshot('1: initial state');\n \n- let parentID = ((store.getElementIDAtIndex(1): any): number);\n+ const parentID = ((store.getElementIDAtIndex(1): any): number);\n utils.act(() => dispatch({type: 'SELECT_OWNER', payload: parentID}));\n utils.act(() => renderer.update());\n expect(state).toMatchSnapshot('2: parent owners tree');\n@@ -507,7 +507,7 @@ describe('TreeListContext', () => {\n utils.act(() => (renderer = TestRenderer.create()));\n expect(state).toMatchSnapshot('1: initial state');\n \n- let parentID = ((store.getElementIDAtIndex(1): any): number);\n+ const parentID = ((store.getElementIDAtIndex(1): any): number);\n utils.act(() => dispatch({type: 'SELECT_OWNER', payload: parentID}));\n utils.act(() => renderer.update());\n expect(state).toMatchSnapshot('2: parent owners tree');\n@@ -545,7 +545,7 @@ describe('TreeListContext', () => {\n utils.act(() => (renderer = TestRenderer.create()));\n expect(state).toMatchSnapshot('1: initial state');\n \n- let childID = ((store.getElementIDAtIndex(1): any): number);\n+ const childID = ((store.getElementIDAtIndex(1): any): number);\n utils.act(() => dispatch({type: 'SELECT_OWNER', payload: childID}));\n utils.act(() => renderer.update());\n expect(state).toMatchSnapshot('2: child owners tree');\n@@ -553,7 +553,7 @@ describe('TreeListContext', () => {\n await utils.actAsync(() => ReactDOM.render(, container));\n expect(state).toMatchSnapshot('3: remove child');\n \n- let parentID = ((store.getElementIDAtIndex(0): any): number);\n+ const parentID = ((store.getElementIDAtIndex(0): any): number);\n utils.act(() => dispatch({type: 'SELECT_OWNER', payload: parentID}));\n utils.act(() => renderer.update());\n expect(state).toMatchSnapshot('4: parent owners tree');\ndiff --git a\/packages\/react-devtools-shared\/src\/backend\/NativeStyleEditor\/setupNativeStyleEditor.js b\/packages\/react-devtools-shared\/src\/backend\/NativeStyleEditor\/setupNativeStyleEditor.js\nindex afa189f122..35b313e160 100644\n--- a\/packages\/react-devtools-shared\/src\/backend\/NativeStyleEditor\/setupNativeStyleEditor.js\n+++ b\/packages\/react-devtools-shared\/src\/backend\/NativeStyleEditor\/setupNativeStyleEditor.js\n@@ -171,7 +171,7 @@ function measureStyle(\n \n function shallowClone(object: Object): Object {\n const cloned = {};\n- for (let n in object) {\n+ for (const n in object) {\n cloned[n] = object[n];\n }\n return cloned;\ndiff --git a\/packages\/react-devtools-shared\/src\/backend\/agent.js b\/packages\/react-devtools-shared\/src\/backend\/agent.js\nindex f457f43199..030fe0b69d 100644\n--- a\/packages\/react-devtools-shared\/src\/backend\/agent.js\n+++ b\/packages\/react-devtools-shared\/src\/backend\/agent.js\n@@ -211,7 +211,7 @@ export default class Agent extends EventEmitter<{|\n }\n \n getIDForNode(node: Object): number | null {\n- for (let rendererID in this._rendererInterfaces) {\n+ for (const rendererID in this._rendererInterfaces) {\n const renderer = ((this._rendererInterfaces[\n (rendererID: any)\n ]: any): RendererInterface);\n@@ -389,7 +389,7 @@ export default class Agent extends EventEmitter<{|\n \n setTraceUpdatesEnabled(traceUpdatesEnabled);\n \n- for (let rendererID in this._rendererInterfaces) {\n+ for (const rendererID in this._rendererInterfaces) {\n const renderer = ((this._rendererInterfaces[\n (rendererID: any)\n ]: any): RendererInterface);\n@@ -413,7 +413,7 @@ export default class Agent extends EventEmitter<{|\n startProfiling = (recordChangeDescriptions: boolean) => {\n this._recordChangeDescriptions = recordChangeDescriptions;\n this._isProfiling = true;\n- for (let rendererID in this._rendererInterfaces) {\n+ for (const rendererID in this._rendererInterfaces) {\n const renderer = ((this._rendererInterfaces[\n (rendererID: any)\n ]: any): RendererInterface);\n@@ -425,7 +425,7 @@ export default class Agent extends EventEmitter<{|\n stopProfiling = () => {\n this._isProfiling = false;\n this._recordChangeDescriptions = false;\n- for (let rendererID in this._rendererInterfaces) {\n+ for (const rendererID in this._rendererInterfaces) {\n const renderer = ((this._rendererInterfaces[\n (rendererID: any)\n ]: any): RendererInterface);\n@@ -456,7 +456,7 @@ export default class Agent extends EventEmitter<{|\n };\n \n updateComponentFilters = (componentFilters: Array) => {\n- for (let rendererID in this._rendererInterfaces) {\n+ for (const rendererID in this._rendererInterfaces) {\n const renderer = ((this._rendererInterfaces[\n (rendererID: any)\n ]: any): RendererInterface);\ndiff --git a\/packages\/react-devtools-shared\/src\/backend\/console.js b\/packages\/react-devtools-shared\/src\/backend\/console.js\nindex 7bd7efbcd5..ab0f1349c6 100644\n--- a\/packages\/react-devtools-shared\/src\/backend\/console.js\n+++ b\/packages\/react-devtools-shared\/src\/backend\/console.js\n@@ -27,7 +27,7 @@ const injectedRenderers: Map<\n \n let targetConsole: Object = console;\n let targetConsoleMethods = {};\n-for (let method in console) {\n+for (const method in console) {\n targetConsoleMethods[method] = console[method];\n }\n \n@@ -40,7 +40,7 @@ export function dangerous_setTargetConsoleForTesting(\n targetConsole = targetConsoleForTesting;\n \n targetConsoleMethods = {};\n- for (let method in targetConsole) {\n+ for (const method in targetConsole) {\n targetConsoleMethods[method] = console[method];\n }\n }\n@@ -77,7 +77,7 @@ export function patch(): void {\n const originalConsoleMethods = {};\n \n unpatchFn = () => {\n- for (let method in originalConsoleMethods) {\n+ for (const method in originalConsoleMethods) {\n try {\n \/\/ $FlowFixMe property error|warn is not writable.\n targetConsole[method] = originalConsoleMethods[method];\n@@ -101,7 +101,7 @@ export function patch(): void {\n \/\/ If there's a component stack for at least one of the injected renderers, append it.\n \/\/ We don't handle the edge case of stacks for more than one (e.g. interleaved renderers?)\n \/\/ eslint-disable-next-line no-for-of-loops\/no-for-of-loops\n- for (let {\n+ for (const {\n getCurrentFiber,\n getDisplayNameForFiber,\n } of injectedRenderers.values()) {\ndiff --git a\/packages\/react-devtools-shared\/src\/backend\/describeComponentFrame.js b\/packages\/react-devtools-shared\/src\/backend\/describeComponentFrame.js\nindex b9830fdf71..1be9d86494 100644\n--- a\/packages\/react-devtools-shared\/src\/backend\/describeComponentFrame.js\n+++ b\/packages\/react-devtools-shared\/src\/backend\/describeComponentFrame.js\n@@ -21,7 +21,7 @@ export default function describeComponentFrame(\n ) {\n let sourceInfo = '';\n if (source) {\n- let path = source.fileName;\n+ const path = source.fileName;\n let fileName = path.replace(BEFORE_SLASH_RE, '');\n if (__DEV__) {\n \/\/ In DEV, include code for a common special case:\ndiff --git a\/packages\/react-devtools-shared\/src\/backend\/legacy\/renderer.js b\/packages\/react-devtools-shared\/src\/backend\/legacy\/renderer.js\nindex 6c78d481c7..093fa83122 100644\n--- a\/packages\/react-devtools-shared\/src\/backend\/legacy\/renderer.js\n+++ b\/packages\/react-devtools-shared\/src\/backend\/legacy\/renderer.js\n@@ -87,7 +87,7 @@ function getElementType(internalInstance: InternalInstance): ElementType {\n }\n \n function getChildren(internalInstance: Object): Array {\n- let children = [];\n+ const children = [];\n \n \/\/ If the parent is a native node without rendered children, but with\n \/\/ multiple string children, then the `element` that gets passed in here is\n@@ -106,7 +106,7 @@ function getChildren(internalInstance: Object): Array {\n }\n } else if (internalInstance._renderedChildren) {\n const renderedChildren = internalInstance._renderedChildren;\n- for (let name in renderedChildren) {\n+ for (const name in renderedChildren) {\n const child = renderedChildren[name];\n if (getElementType(child) !== ElementTypeOtherOrUnknown) {\n children.push(child);\n@@ -386,8 +386,8 @@ export function attach(\n ? getID(internalInstance._currentElement._owner)\n : 0;\n \n- let displayNameStringID = getStringID(displayName);\n- let keyStringID = getStringID(key);\n+ const displayNameStringID = getStringID(displayName);\n+ const keyStringID = getStringID(key);\n pushOperation(TREE_OPERATION_ADD);\n pushOperation(id);\n pushOperation(type);\n@@ -447,7 +447,7 @@ export function attach(\n renderer.Mount._instancesByReactRootID ||\n renderer.Mount._instancesByContainerID;\n \n- for (let key in roots) {\n+ for (const key in roots) {\n const internalInstance = roots[key];\n const id = getID(internalInstance);\n crawlAndRecordInitialMounts(id, 0, id);\n@@ -455,8 +455,8 @@ export function attach(\n }\n }\n \n- let pendingOperations: Array = [];\n- let pendingStringTable: Map = new Map();\n+ const pendingOperations: Array = [];\n+ const pendingStringTable: Map = new Map();\n let pendingUnmountedIDs: Array = [];\n let pendingStringTableLength: number = 0;\n let pendingUnmountedRootID: number | null = null;\ndiff --git a\/packages\/react-devtools-shared\/src\/backend\/legacy\/utils.js b\/packages\/react-devtools-shared\/src\/backend\/legacy\/utils.js\nindex 2634ab1edf..dcf6b969be 100644\n--- a\/packages\/react-devtools-shared\/src\/backend\/legacy\/utils.js\n+++ b\/packages\/react-devtools-shared\/src\/backend\/legacy\/utils.js\n@@ -29,7 +29,7 @@ export function decorateMany(\n }\n \n export function restoreMany(source: Object, olds: Object): void {\n- for (let name in olds) {\n+ for (const name in olds) {\n source[name] = olds[name];\n }\n }\ndiff --git a\/packages\/react-devtools-shared\/src\/backend\/renderer.js b\/packages\/react-devtools-shared\/src\/backend\/renderer.js\nindex d0012684af..17e5930f29 100644\n--- a\/packages\/react-devtools-shared\/src\/backend\/renderer.js\n+++ b\/packages\/react-devtools-shared\/src\/backend\/renderer.js\n@@ -543,7 +543,7 @@ export function attach(\n \n \/\/ Highlight updates\n let traceUpdatesEnabled: boolean = false;\n- let traceUpdatesForNodes: Set = new Set();\n+ const traceUpdatesForNodes: Set = new Set();\n \n function applyComponentFilters(componentFilters: Array) {\n hideElementsWithTypes.clear();\n@@ -675,7 +675,7 @@ export function attach(\n const displayName = getDisplayNameForFiber(fiber);\n if (displayName != null) {\n \/\/ eslint-disable-next-line no-for-of-loops\/no-for-of-loops\n- for (let displayNameRegExp of hideElementsWithDisplayNames) {\n+ for (const displayNameRegExp of hideElementsWithDisplayNames) {\n if (displayNameRegExp.test(displayName)) {\n return true;\n }\n@@ -686,7 +686,7 @@ export function attach(\n if (_debugSource != null && hideElementsWithPaths.size > 0) {\n const {fileName} = _debugSource;\n \/\/ eslint-disable-next-line no-for-of-loops\/no-for-of-loops\n- for (let pathRegExp of hideElementsWithPaths) {\n+ for (const pathRegExp of hideElementsWithPaths) {\n if (pathRegExp.test(fileName)) {\n return true;\n }\n@@ -960,7 +960,7 @@ export function attach(\n const keys = new Set([...Object.keys(prev), ...Object.keys(next)]);\n const changedKeys = [];\n \/\/ eslint-disable-next-line no-for-of-loops\/no-for-of-loops\n- for (let key of keys) {\n+ for (const key of keys) {\n if (prev[key] !== next[key]) {\n changedKeys.push(key);\n }\n@@ -994,11 +994,11 @@ export function attach(\n }\n }\n \n- let pendingOperations: Array = [];\n- let pendingRealUnmountedIDs: Array = [];\n- let pendingSimulatedUnmountedIDs: Array = [];\n+ const pendingOperations: Array = [];\n+ const pendingRealUnmountedIDs: Array = [];\n+ const pendingSimulatedUnmountedIDs: Array = [];\n let pendingOperationsQueue: Array> | null = [];\n- let pendingStringTable: Map = new Map();\n+ const pendingStringTable: Map = new Map();\n let pendingStringTableLength: number = 0;\n let pendingUnmountedRootID: number | null = null;\n \n@@ -1173,12 +1173,12 @@ export function attach(\n ? getFiberID(getPrimaryFiber(parentFiber))\n : 0;\n \n- let displayNameStringID = getStringID(displayName);\n+ const displayNameStringID = getStringID(displayName);\n \n \/\/ This check is a guard to handle a React element that has been modified\n \/\/ in such a way as to bypass the default stringification of the \"key\" property.\n- let keyString = key === null ? null : '' + key;\n- let keyStringID = getStringID(keyString);\n+ const keyString = key === null ? null : '' + key;\n+ const keyStringID = getStringID(keyString);\n \n pushOperation(TREE_OPERATION_ADD);\n pushOperation(id);\n@@ -1974,7 +1974,7 @@ export function attach(\n return null;\n }\n \n- let alternate = fiber.alternate;\n+ const alternate = fiber.alternate;\n if (!alternate) {\n \/\/ If there is no alternate, then we only need to check if it is mounted.\n const state = isFiberMountedImpl(fiber);\n@@ -1992,12 +1992,12 @@ export function attach(\n let a: Fiber = fiber;\n let b: Fiber = alternate;\n while (true) {\n- let parentA = a.return;\n+ const parentA = a.return;\n if (parentA === null) {\n \/\/ We're at the root.\n break;\n }\n- let parentB = parentA.alternate;\n+ const parentB = parentA.alternate;\n if (parentB === null) {\n \/\/ There is no alternate. This is an unusual case. Currently, it only\n \/\/ happens when a Suspense component is hidden. An extra fragment fiber\n@@ -2131,7 +2131,7 @@ export function attach(\n }\n \n function prepareViewElementSource(id: number): void {\n- let fiber = idToFiberMap.get(id);\n+ const fiber = idToFiberMap.get(id);\n if (fiber == null) {\n console.warn(`Could not find Fiber with id \"${id}\"`);\n return;\n@@ -2163,7 +2163,7 @@ export function attach(\n }\n \n function getOwnersList(id: number): Array | null {\n- let fiber = findCurrentFiberUsingSlowPathById(id);\n+ const fiber = findCurrentFiberUsingSlowPathById(id);\n if (fiber == null) {\n return null;\n }\n@@ -2200,7 +2200,7 @@ export function attach(\n let instance = null;\n let style = null;\n \n- let fiber = findCurrentFiberUsingSlowPathById(id);\n+ const fiber = findCurrentFiberUsingSlowPathById(id);\n if (fiber !== null) {\n instance = fiber.stateNode;\n \n@@ -2213,7 +2213,7 @@ export function attach(\n }\n \n function inspectElementRaw(id: number): InspectedElement | null {\n- let fiber = findCurrentFiberUsingSlowPathById(id);\n+ const fiber = findCurrentFiberUsingSlowPathById(id);\n if (fiber == null) {\n return null;\n }\n@@ -2328,7 +2328,7 @@ export function attach(\n const originalConsoleMethods = {};\n \n \/\/ Temporarily disable all console logging before re-running the hook.\n- for (let method in console) {\n+ for (const method in console) {\n try {\n originalConsoleMethods[method] = console[method];\n \/\/ $FlowFixMe property error|warn is not writable.\n@@ -2343,7 +2343,7 @@ export function attach(\n );\n } finally {\n \/\/ Restore original console functionality.\n- for (let method in originalConsoleMethods) {\n+ for (const method in originalConsoleMethods) {\n try {\n \/\/ $FlowFixMe property error|warn is not writable.\n console[method] = originalConsoleMethods[method];\n@@ -2462,7 +2462,7 @@ export function attach(\n function updateSelectedElement(inspectedElement: InspectedElement): void {\n const {hooks, id, props} = inspectedElement;\n \n- let fiber = idToFiberMap.get(id);\n+ const fiber = idToFiberMap.get(id);\n if (fiber == null) {\n console.warn(`Could not find Fiber with id \"${id}\"`);\n return;\n@@ -2912,7 +2912,7 @@ export function attach(\n return false;\n }\n \n- let forceFallbackForSuspenseIDs = new Set();\n+ const forceFallbackForSuspenseIDs = new Set();\n function shouldSuspendFiberAccordingToSet(fiber) {\n const id = getFiberID(getPrimaryFiber(((fiber: any): Fiber)));\n return forceFallbackForSuspenseIDs.has(id);\ndiff --git a\/packages\/react-devtools-shared\/src\/backend\/views\/Highlighter\/Overlay.js b\/packages\/react-devtools-shared\/src\/backend\/views\/Highlighter\/Overlay.js\nindex 00c300e362..7e6cc59565 100644\n--- a\/packages\/react-devtools-shared\/src\/backend\/views\/Highlighter\/Overlay.js\n+++ b\/packages\/react-devtools-shared\/src\/backend\/views\/Highlighter\/Overlay.js\n@@ -155,11 +155,11 @@ export default class Overlay {\n \n constructor() {\n \/\/ Find the root window, because overlays are positioned relative to it.\n- let currentWindow = window.__REACT_DEVTOOLS_TARGET_WINDOW__ || window;\n+ const currentWindow = window.__REACT_DEVTOOLS_TARGET_WINDOW__ || window;\n this.window = currentWindow;\n \n \/\/ When opened in shells\/dev, the tooltip should be bound by the app iframe, not by the topmost window.\n- let tipBoundsWindow = window.__REACT_DEVTOOLS_TARGET_WINDOW__ || window;\n+ const tipBoundsWindow = window.__REACT_DEVTOOLS_TARGET_WINDOW__ || window;\n this.tipBoundsWindow = tipBoundsWindow;\n \n const doc = currentWindow.document;\ndiff --git a\/packages\/react-devtools-shared\/src\/backend\/views\/TraceUpdates\/index.js b\/packages\/react-devtools-shared\/src\/backend\/views\/TraceUpdates\/index.js\nindex 1861b7d155..e94d4fd5c1 100644\n--- a\/packages\/react-devtools-shared\/src\/backend\/views\/TraceUpdates\/index.js\n+++ b\/packages\/react-devtools-shared\/src\/backend\/views\/TraceUpdates\/index.js\n@@ -135,7 +135,7 @@ function measureNode(node: Object): Rect | null {\n return null;\n }\n \n- let currentWindow = window.__REACT_DEVTOOLS_TARGET_WINDOW__ || window;\n+ const currentWindow = window.__REACT_DEVTOOLS_TARGET_WINDOW__ || window;\n \n return getNestedBoundingClientRect(node, currentWindow);\n }\ndiff --git a\/packages\/react-devtools-shared\/src\/devtools\/ProfilerStore.js b\/packages\/react-devtools-shared\/src\/devtools\/ProfilerStore.js\nindex 12299a9219..b2e4ad051d 100644\n--- a\/packages\/react-devtools-shared\/src\/devtools\/ProfilerStore.js\n+++ b\/packages\/react-devtools-shared\/src\/devtools\/ProfilerStore.js\n@@ -297,7 +297,7 @@ export default class ProfilerStore extends EventEmitter<{|\n \n \/\/ Record all renderer IDs initially too (in case of unmount)\n \/\/ eslint-disable-next-line no-for-of-loops\/no-for-of-loops\n- for (let rendererID of this._store.rootIDToRendererID.values()) {\n+ for (const rendererID of this._store.rootIDToRendererID.values()) {\n if (!this._initialRendererIDs.has(rendererID)) {\n this._initialRendererIDs.add(rendererID);\n }\ndiff --git a\/packages\/react-devtools-shared\/src\/devtools\/store.js b\/packages\/react-devtools-shared\/src\/devtools\/store.js\nindex 1e246cab0b..3d98d0ff15 100644\n--- a\/packages\/react-devtools-shared\/src\/devtools\/store.js\n+++ b\/packages\/react-devtools-shared\/src\/devtools\/store.js\n@@ -479,7 +479,7 @@ export default class Store extends EventEmitter<{|\n \n getOwnersListForElement(ownerID: number): Array {\n const list = [];\n- let element = this._idToElement.get(ownerID);\n+ const element = this._idToElement.get(ownerID);\n if (element != null) {\n list.push({\n ...element,\ndiff --git a\/packages\/react-devtools-shared\/src\/devtools\/utils.js b\/packages\/react-devtools-shared\/src\/devtools\/utils.js\nindex c5a07f3146..bd281d28e1 100644\n--- a\/packages\/react-devtools-shared\/src\/devtools\/utils.js\n+++ b\/packages\/react-devtools-shared\/src\/devtools\/utils.js\n@@ -44,7 +44,8 @@ export function printElement(element: Element, includeWeight: boolean = false) {\n }\n }\n \n- let hocs = hocDisplayNames === null ? '' : ` [${hocDisplayNames.join('][')}]`;\n+ const hocs =\n+ hocDisplayNames === null ? '' : ` [${hocDisplayNames.join('][')}]`;\n \n let suffix = '';\n if (includeWeight) {\ndiff --git a\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/InspectedElementContext.js b\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/InspectedElementContext.js\nindex 454d574a79..9e62f9e262 100644\n--- a\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/InspectedElementContext.js\n+++ b\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/InspectedElementContext.js\n@@ -76,7 +76,7 @@ const resource: Resource<\n InspectedElementFrontend,\n > = createResource(\n (element: Element) => {\n- let request = inProgressRequests.get(element);\n+ const request = inProgressRequests.get(element);\n if (request != null) {\n return request.promise;\n }\n@@ -351,16 +351,19 @@ function hydrateHelper(\n path?: Array,\n ): Object | null {\n if (dehydratedData !== null) {\n- let {cleaned, data, unserializable} = dehydratedData;\n+ const {cleaned, data, unserializable} = dehydratedData;\n \n if (path) {\n const {length} = path;\n if (length > 0) {\n \/\/ Hydration helper requires full paths, but inspection dehydrates with relative paths.\n \/\/ In that event it's important that we adjust the \"cleaned\" paths to match.\n- cleaned = cleaned.map(cleanedPath => cleanedPath.slice(length));\n- unserializable = unserializable.map(unserializablePath =>\n- unserializablePath.slice(length),\n+ return hydrate(\n+ data,\n+ cleaned.map(cleanedPath => cleanedPath.slice(length)),\n+ unserializable.map(unserializablePath =>\n+ unserializablePath.slice(length),\n+ ),\n );\n }\n }\ndiff --git a\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/KeyValue.js b\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/KeyValue.js\nindex 54726c7e04..3a102a8e34 100644\n--- a\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/KeyValue.js\n+++ b\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/KeyValue.js\n@@ -217,7 +217,7 @@ export default function KeyValue({\n const hasChildren = entries.length > 0;\n const displayName = getMetaValueLabel(value);\n \n- let areChildrenReadOnly = isReadOnly || !!value[meta.readonly];\n+ const areChildrenReadOnly = isReadOnly || !!value[meta.readonly];\n children = entries.map>(([key, keyValue]) => (\n = createResource(\n (element: Element) => {\n- let request = inProgressRequests.get(element);\n+ const request = inProgressRequests.get(element);\n if (request != null) {\n return request.promise;\n }\n@@ -108,7 +108,7 @@ function NativeStyleContextController({children}: Props) {\n \/\/ This effect handler invalidates the suspense cache and schedules rendering updates with React.\n useEffect(() => {\n const onStyleAndLayout = ({id, layout, style}: StyleAndLayoutBackend) => {\n- let element = store.getElementByID(id);\n+ const element = store.getElementByID(id);\n if (element !== null) {\n const styleAndLayout: StyleAndLayoutFrontend = {\n layout,\ndiff --git a\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/OwnersListContext.js b\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/OwnersListContext.js\nindex 493ee8d966..a979d0fa3d 100644\n--- a\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/OwnersListContext.js\n+++ b\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/OwnersListContext.js\n@@ -35,7 +35,7 @@ type InProgressRequest = {|\n const inProgressRequests: WeakMap = new WeakMap();\n const resource: Resource> = createResource(\n (element: Element) => {\n- let request = inProgressRequests.get(element);\n+ const request = inProgressRequests.get(element);\n if (request != null) {\n return request.promise;\n }\ndiff --git a\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/Tree.js b\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/Tree.js\nindex 07c779d758..43114cd4d9 100644\n--- a\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/Tree.js\n+++ b\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/Tree.js\n@@ -409,7 +409,7 @@ function updateIndentationSizeVar(\n let maxIndentationSize: number = indentationSizeRef.current;\n \n \/\/ eslint-disable-next-line no-for-of-loops\/no-for-of-loops\n- for (let child of innerDiv.children) {\n+ for (const child of innerDiv.children) {\n const depth = parseInt(child.getAttribute('data-depth'), 10) || 0;\n \n let childWidth: number = 0;\ndiff --git a\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/TreeContext.js b\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/TreeContext.js\nindex 8d23660dbc..61de6eaa97 100644\n--- a\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/TreeContext.js\n+++ b\/packages\/react-devtools-shared\/src\/devtools\/views\/Components\/TreeContext.js\n@@ -157,7 +157,8 @@ type State = {|\n |};\n \n function reduceTreeState(store: Store, state: State, action: Action): State {\n- let {numElements, ownerID, selectedElementIndex, selectedElementID} = state;\n+ let {numElements, selectedElementIndex, selectedElementID} = state;\n+ const ownerID = state.ownerID;\n \n let lookupIDForIndex = true;\n \n@@ -277,13 +278,13 @@ function reduceTreeState(store: Store, state: State, action: Action): State {\n \n function reduceSearchState(store: Store, state: State, action: Action): State {\n let {\n- ownerID,\n searchIndex,\n searchResults,\n searchText,\n selectedElementID,\n selectedElementIndex,\n } = state;\n+ const ownerID = state.ownerID;\n \n const prevSearchIndex = searchIndex;\n const prevSearchText = searchText;\n@@ -452,10 +453,8 @@ function reduceOwnersState(store: Store, state: State, action: Action): State {\n selectedElementIndex,\n ownerID,\n ownerFlatTree,\n- searchIndex,\n- searchResults,\n- searchText,\n } = state;\n+ const {searchIndex, searchResults, searchText} = state;\n \n let prevSelectedElementIndex = selectedElementIndex;\n \n@@ -734,7 +733,7 @@ function TreeContextController({\n prevSelectedElementID.current = state.selectedElementID;\n \n if (state.selectedElementID !== null) {\n- let element = store.getElementByID(state.selectedElementID);\n+ const element = store.getElementByID(state.selectedElementID);\n if (element !== null && element.parentID > 0) {\n store.toggleIsCollapsed(element.parentID, false);\n }\ndiff --git a\/packages\/react-devtools-shared\/src\/devtools\/views\/DevTools.js b\/packages\/react-devtools-shared\/src\/devtools\/views\/DevTools.js\nindex 28714cb927..56f11a1c3f 100644\n--- a\/packages\/react-devtools-shared\/src\/devtools\/views\/DevTools.js\n+++ b\/packages\/react-devtools-shared\/src\/devtools\/views\/DevTools.js\n@@ -107,11 +107,13 @@ export default function DevTools({\n viewAttributeSourceFunction,\n viewElementSourceFunction,\n }: Props) {\n- let [tab, setTab] = useLocalStorage(\n+ const [currentTab, setTab] = useLocalStorage(\n 'React::DevTools::defaultTab',\n defaultTab,\n );\n \n+ let tab = currentTab;\n+\n if (overrideTab != null) {\n tab = overrideTab;\n }\ndiff --git a\/packages\/react-devtools-shared\/src\/devtools\/views\/Profiler\/CommitFlamegraphListItem.js b\/packages\/react-devtools-shared\/src\/devtools\/views\/Profiler\/CommitFlamegraphListItem.js\nindex c998998cb4..5b94c94e2d 100644\n--- a\/packages\/react-devtools-shared\/src\/devtools\/views\/Profiler\/CommitFlamegraphListItem.js\n+++ b\/packages\/react-devtools-shared\/src\/devtools\/views\/Profiler\/CommitFlamegraphListItem.js\n@@ -64,7 +64,7 @@ function CommitFlamegraphListItem({data, index, style}: Props) {\n \n const row = rows[index];\n \n- let selectedNodeOffset = scaleX(\n+ const selectedNodeOffset = scaleX(\n selectedChartNode !== null ? selectedChartNode.offset : 0,\n width,\n );\ndiff --git a\/packages\/react-devtools-shared\/src\/events.js b\/packages\/react-devtools-shared\/src\/events.js\nindex aacffb3845..c1b82e025a 100644\n--- a\/packages\/react-devtools-shared\/src\/events.js\n+++ b\/packages\/react-devtools-shared\/src\/events.js\n@@ -14,7 +14,7 @@ export default class EventEmitter {\n event: Event,\n listener: (...$ElementType) => any,\n ): void {\n- let listeners = this.listenersMap.get(event);\n+ const listeners = this.listenersMap.get(event);\n if (listeners === undefined) {\n this.listenersMap.set(event, [listener]);\n } else {\ndiff --git a\/packages\/react-devtools-shared\/src\/hydration.js b\/packages\/react-devtools-shared\/src\/hydration.js\nindex e7d7630cde..c134f7797d 100644\n--- a\/packages\/react-devtools-shared\/src\/hydration.js\n+++ b\/packages\/react-devtools-shared\/src\/hydration.js\n@@ -287,7 +287,7 @@ export function dehydrate(\n return createDehydrated(type, true, data, cleaned, path);\n } else {\n const object = {};\n- for (let name in data) {\n+ for (const name in data) {\n object[name] = dehydrate(\n data[name],\n cleaned,\ndiff --git a\/packages\/react-devtools-shared\/src\/utils.js b\/packages\/react-devtools-shared\/src\/utils.js\nindex 19b6ece3a7..f4982e814b 100644\n--- a\/packages\/react-devtools-shared\/src\/utils.js\n+++ b\/packages\/react-devtools-shared\/src\/utils.js\n@@ -49,7 +49,7 @@ const cachedDisplayNames: WeakMap = new WeakMap();\n \n \/\/ On large trees, encoding takes significant time.\n \/\/ Try to reuse the already encoded strings.\n-let encodedStringCache = new LRU({max: 1000});\n+const encodedStringCache = new LRU({max: 1000});\n \n export function alphaSortKeys(a: string, b: string): number {\n if (a > b) {\n@@ -96,7 +96,7 @@ export function utfDecodeString(array: Array): string {\n }\n \n export function utfEncodeString(string: string): Array {\n- let cached = encodedStringCache.get(string);\n+ const cached = encodedStringCache.get(string);\n if (cached !== undefined) {\n return cached;\n }\n@@ -281,12 +281,12 @@ export function separateDisplayNameAndHOCs(\n \/\/ Pulled from react-compat\n \/\/ https:\/\/github.com\/developit\/preact-compat\/blob\/7c5de00e7c85e2ffd011bf3af02899b63f699d3a\/src\/index.js#L349\n export function shallowDiffers(prev: Object, next: Object): boolean {\n- for (let attribute in prev) {\n+ for (const attribute in prev) {\n if (!(attribute in next)) {\n return true;\n }\n }\n- for (let attribute in next) {\n+ for (const attribute in next) {\n if (prev[attribute] !== next[attribute]) {\n return true;\n }\ndiff --git a\/packages\/react-devtools-shell\/src\/app\/SuspenseTree\/index.js b\/packages\/react-devtools-shell\/src\/app\/SuspenseTree\/index.js\nindex 0044485b8b..4e910e1698 100644\n--- a\/packages\/react-devtools-shell\/src\/app\/SuspenseTree\/index.js\n+++ b\/packages\/react-devtools-shell\/src\/app\/SuspenseTree\/index.js\n@@ -47,13 +47,13 @@ function PrimaryFallbackTest({initialSuspend}) {\n }\n \n function useTestSequence(label, T1, T2) {\n- let [step, setStep] = useState(0);\n- let next = (\n+ const [step, setStep] = useState(0);\n+ const next = (\n

dillon1000/react

Files changed