Reland Remove redundant initial of isArray (#21188)

* Remove redundant initial of isArray (#21163)

* Reapply prettier

* Type the isArray function with refinement support

This ensures that an argument gets refined just like it does if isArray is
used directly.

I'm not sure how to express with just a direct reference so I added a
function wrapper and confirmed that this does get inlined properly by
closure compiler.

* A few more

* Rename unit test to internal

This is not testing a bundle.

Co-authored-by: Behnam Mohammadi <[email protected]>

Author: sebmarkbage

packages/eslint-plugin-react-hooks/src/ExhaustiveDeps.js

@@ -145,6 +145,8 @@ export default {
         componentScope = currentScope;
       }
 
+      const isArray = Array.isArray;
+
       // Next we'll define a few helpers that helps us
       // tell if some values don't have to be declared as deps.
 
@@ -157,7 +159,7 @@ export default {
       //       ^^^ true for this reference
       // False for everything else.
       function isStableKnownHookValue(resolved) {
-        if (!Array.isArray(resolved.defs)) {
+        if (!isArray(resolved.defs)) {
           return false;
         }
         const def = resolved.defs[0];
@@ -226,7 +228,7 @@ export default {
           if (
             id.type === 'ArrayPattern' &&
             id.elements.length === 2 &&
-            Array.isArray(resolved.identifiers)
+            isArray(resolved.identifiers)
           ) {
             // Is second tuple value the same reference we're checking?
             if (id.elements[1] === resolved.identifiers[0]) {
@@ -253,10 +255,7 @@ export default {
             }
           }
         } else if (name === 'useTransition') {
-          if (
-            id.type === 'ArrayPattern' &&
-            Array.isArray(resolved.identifiers)
-          ) {
+          if (id.type === 'ArrayPattern' && isArray(resolved.identifiers)) {
             // Is first tuple value the same reference we're checking?
             if (id.elements[0] === resolved.identifiers[0]) {
               // Setter is stable.
@@ -270,7 +269,7 @@ export default {
 
       // Some are just functions that don't reference anything dynamic.
       function isFunctionWithoutCapturedValues(resolved) {
-        if (!Array.isArray(resolved.defs)) {
+        if (!isArray(resolved.defs)) {
           return false;
         }
         const def = resolved.defs[0];

packages/jest-react/src/JestReact.js

@@ -8,6 +8,7 @@
 import {REACT_ELEMENT_TYPE, REACT_FRAGMENT_TYPE} from 'shared/ReactSymbols';
 
 import invariant from 'shared/invariant';
+import isArray from 'shared/isArray';
 
 function captureAssertion(fn) {
   // Trick to use a Jest matcher inside another Jest matcher. `fn` contains an
@@ -42,7 +43,7 @@ export function unstable_toMatchRenderedOutput(root, expectedJSX) {
   let actualJSX;
   if (actualJSON === null || typeof actualJSON === 'string') {
     actualJSX = actualJSON;
-  } else if (Array.isArray(actualJSON)) {
+  } else if (isArray(actualJSON)) {
     if (actualJSON.length === 0) {
       actualJSX = null;
     } else if (actualJSON.length === 1) {

packages/react-devtools-shared/src/backend/renderer.js

@@ -105,6 +105,7 @@ import type {
   ElementType,
 } from 'react-devtools-shared/src/types';
 import is from 'shared/objectIs';
+import isArray from 'shared/isArray';
 
 type getDisplayNameForFiberType = (fiber: Fiber) => string | null;
 type getTypeSymbolType = (type: any) => Symbol | number;
@@ -1137,7 +1138,7 @@ export function attach(
       memoizedState.hasOwnProperty('create') &&
       memoizedState.hasOwnProperty('destroy') &&
       memoizedState.hasOwnProperty('deps') &&
-      (memoizedState.deps === null || Array.isArray(memoizedState.deps)) &&
+      (memoizedState.deps === null || isArray(memoizedState.deps)) &&
       memoizedState.hasOwnProperty('next')
     );
   }

packages/react-devtools-shared/src/backend/utils.js

@@ -9,6 +9,7 @@
 
 import {copy} from 'clipboard-js';
 import {dehydrate} from '../hydration';
+import isArray from 'shared/isArray';
 
 import type {DehydratedData} from 'react-devtools-shared/src/devtools/views/Components/types';
 
@@ -61,9 +62,9 @@ export function copyWithDelete(
   index: number = 0,
 ): Object | Array<any> {
   const key = path[index];
-  const updated = Array.isArray(obj) ? obj.slice() : {...obj};
+  const updated = isArray(obj) ? obj.slice() : {...obj};
   if (index + 1 === path.length) {
-    if (Array.isArray(updated)) {
+    if (isArray(updated)) {
       updated.splice(((key: any): number), 1);
     } else {
       delete updated[key];
@@ -84,12 +85,12 @@ export function copyWithRename(
   index: number = 0,
 ): Object | Array<any> {
   const oldKey = oldPath[index];
-  const updated = Array.isArray(obj) ? obj.slice() : {...obj};
+  const updated = isArray(obj) ? obj.slice() : {...obj};
   if (index + 1 === oldPath.length) {
     const newKey = newPath[index];
     // $FlowFixMe number or string is fine here
     updated[newKey] = updated[oldKey];
-    if (Array.isArray(updated)) {
+    if (isArray(updated)) {
       updated.splice(((oldKey: any): number), 1);
     } else {
       delete updated[oldKey];
@@ -111,7 +112,7 @@ export function copyWithSet(
     return value;
   }
   const key = path[index];
-  const updated = Array.isArray(obj) ? obj.slice() : {...obj};
+  const updated = isArray(obj) ? obj.slice() : {...obj};
   // $FlowFixMe number or string is fine here
   updated[key] = copyWithSet(obj[key], path, value, index + 1);
   return updated;

packages/react-dom/src/client/ReactDOMSelect.js

@@ -12,6 +12,7 @@ import {getCurrentFiberOwnerNameInDevOrNull} from 'react-reconciler/src/ReactCur
 
 import {checkControlledValueProps} from '../shared/ReactControlledValuePropTypes';
 import {getToStringValue, toString} from './ToStringValue';
+import isArray from 'shared/isArray';
 
 let didWarnValueDefaultValue;
 
@@ -45,15 +46,15 @@ function checkSelectPropTypes(props) {
       if (props[propName] == null) {
         continue;
       }
-      const isArray = Array.isArray(props[propName]);
-      if (props.multiple && !isArray) {
+      const propNameIsArray = isArray(props[propName]);
+      if (props.multiple && !propNameIsArray) {
         console.error(
           'The `%s` prop supplied to <select> must be an array if ' +
             '`multiple` is true.%s',
           propName,
           getDeclarationErrorAddendum(),
         );
-      } else if (!props.multiple && isArray) {
+      } else if (!props.multiple && propNameIsArray) {
         console.error(
           'The `%s` prop supplied to <select> must be a scalar ' +
             'value if `multiple` is false.%s',

packages/react-dom/src/client/ReactDOMTextarea.js

@@ -8,12 +8,12 @@
  */
 
 import invariant from 'shared/invariant';
+import isArray from 'shared/isArray';
 
 import {checkControlledValueProps} from '../shared/ReactControlledValuePropTypes';
 import {getCurrentFiberOwnerNameInDevOrNull} from 'react-reconciler/src/ReactCurrentFiber';
 import {getToStringValue, toString} from './ToStringValue';
 import type {ToStringValue} from './ToStringValue';
-
 import {disableTextareaChildren} from 'shared/ReactFeatureFlags';
 
 let didWarnValDefaultVal = false;
@@ -100,7 +100,7 @@ export function initWrapperState(element: Element, props: Object) {
           defaultValue == null,
           'If you supply `defaultValue` on a <textarea>, do not pass children.',
         );
-        if (Array.isArray(children)) {
+        if (isArray(children)) {
           invariant(
             children.length <= 1,
             '<textarea> can only have at most one child.',

packages/react-dom/src/server/ReactDOMServerFormatConfig.js

@@ -46,8 +46,7 @@ import hyphenateStyleName from '../shared/hyphenateStyleName';
 import invariant from 'shared/invariant';
 import hasOwnProperty from 'shared/hasOwnProperty';
 import sanitizeURL from '../shared/sanitizeURL';
-
-const isArray = Array.isArray;
+import isArray from 'shared/isArray';
 
 // Per response, global state that is not contextual to the rendering subtree.
 export type ResponseState = {

packages/react-dom/src/server/ReactPartialRenderer.js

@@ -14,6 +14,7 @@ import type {ReactProvider, ReactContext} from 'shared/ReactTypes';
 
 import * as React from 'react';
 import invariant from 'shared/invariant';
+import isArray from 'shared/isArray';
 import getComponentNameFromType from 'shared/getComponentNameFromType';
 import {describeUnknownElementTypeFrameInDEV} from 'shared/ReactComponentStackFrame';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
@@ -1438,7 +1439,7 @@ class ReactDOMServerRenderer {
             defaultValue == null,
             'If you supply `defaultValue` on a <textarea>, do not pass children.',
           );
-          if (Array.isArray(textareaChildren)) {
+          if (isArray(textareaChildren)) {
             invariant(
               textareaChildren.length <= 1,
               '<textarea> can only have at most one child.',
@@ -1467,14 +1468,14 @@ class ReactDOMServerRenderer {
           if (props[propName] == null) {
             continue;
           }
-          const isArray = Array.isArray(props[propName]);
-          if (props.multiple && !isArray) {
+          const propNameIsArray = isArray(props[propName]);
+          if (props.multiple && !propNameIsArray) {
             console.error(
               'The `%s` prop supplied to <select> must be an array if ' +
                 '`multiple` is true.',
               propName,
             );
-          } else if (!props.multiple && isArray) {
+          } else if (!props.multiple && propNameIsArray) {
             console.error(
               'The `%s` prop supplied to <select> must be a scalar ' +
                 'value if `multiple` is false.',
@@ -1515,7 +1516,7 @@ class ReactDOMServerRenderer {
           value = optionChildren;
         }
         selected = false;
-        if (Array.isArray(selectValue)) {
+        if (isArray(selectValue)) {
           // multiple
           for (let j = 0; j < selectValue.length; j++) {
             if ('' + selectValue[j] === value) {

packages/react-dom/src/test-utils/ReactTestUtils.js

@@ -24,6 +24,7 @@ import {
   rethrowCaughtError,
   invokeGuardedCallbackAndCatchFirstError,
 } from 'shared/ReactErrorUtils';
+import isArray from 'shared/isArray';
 
 // Keep in sync with ReactDOM.js, and ReactTestUtilsAct.js:
 const EventInternals =
@@ -97,7 +98,7 @@ function validateClassInstance(inst, methodName) {
   }
   let received;
   const stringified = '' + inst;
-  if (Array.isArray(inst)) {
+  if (isArray(inst)) {
     received = 'an array';
   } else if (inst && inst.nodeType === ELEMENT_NODE && inst.tagName) {
     received = 'a DOM node';
@@ -197,7 +198,7 @@ function scryRenderedDOMComponentsWithClass(root, classNames) {
       }
       const classList = className.split(/\s+/);
 
-      if (!Array.isArray(classNames)) {
+      if (!isArray(classNames)) {
         invariant(
           classNames !== undefined,
           'TestUtils.scryRenderedDOMComponentsWithClass expects a ' +
@@ -365,7 +366,7 @@ function executeDispatch(event, listener, inst) {
 function executeDispatchesInOrder(event) {
   const dispatchListeners = event._dispatchListeners;
   const dispatchInstances = event._dispatchInstances;
-  if (Array.isArray(dispatchListeners)) {
+  if (isArray(dispatchListeners)) {
     for (let i = 0; i < dispatchListeners.length; i++) {
       if (event.isPropagationStopped()) {
         break;

packages/react-native-renderer/src/ReactNativeAttributePayload.js

@@ -12,6 +12,7 @@ import {
   deepDiffer,
   flattenStyle,
 } from 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface';
+import isArray from 'shared/isArray';
 
 import type {AttributeConfiguration} from './ReactNativeTypes';
 
@@ -51,7 +52,7 @@ function restoreDeletedValuesInNestedArray(
   node: NestedNode,
   validAttributes: AttributeConfiguration,
 ) {
-  if (Array.isArray(node)) {
+  if (isArray(node)) {
     let i = node.length;
     while (i-- && removedKeyCount > 0) {
       restoreDeletedValuesInNestedArray(
@@ -163,12 +164,12 @@ function diffNestedProperty(
     return updatePayload;
   }
 
-  if (!Array.isArray(prevProp) && !Array.isArray(nextProp)) {
+  if (!isArray(prevProp) && !isArray(nextProp)) {
     // Both are leaves, we can diff the leaves.
     return diffProperties(updatePayload, prevProp, nextProp, validAttributes);
   }
 
-  if (Array.isArray(prevProp) && Array.isArray(nextProp)) {
+  if (isArray(prevProp) && isArray(nextProp)) {
     // Both are arrays, we can diff the arrays.
     return diffNestedArrayProperty(
       updatePayload,
@@ -178,7 +179,7 @@ function diffNestedProperty(
     );
   }
 
-  if (Array.isArray(prevProp)) {
+  if (isArray(prevProp)) {
     return diffProperties(
       updatePayload,
       // $FlowFixMe - We know that this is always an object when the input is.
@@ -212,7 +213,7 @@ function addNestedProperty(
     return updatePayload;
   }
 
-  if (!Array.isArray(nextProp)) {
+  if (!isArray(nextProp)) {
     // Add each property of the leaf.
     return addProperties(updatePayload, nextProp, validAttributes);
   }
@@ -242,7 +243,7 @@ function clearNestedProperty(
     return updatePayload;
   }
 
-  if (!Array.isArray(prevProp)) {
+  if (!isArray(prevProp)) {
     // Add each property of the leaf.
     return clearProperties(updatePayload, prevProp, validAttributes);
   }