Merge pull request #2064 from reduxjs/warning-stack

Author: markerikson

src/hooks/useSelector.ts

@@ -99,6 +99,12 @@ export function createSelectorHook(context = ReactReduxContext): UseSelector {
             ) {
               const toCompare = selector(state)
               if (!equalityFn(selected, toCompare)) {
+                let stack: string | undefined = undefined
+                try {
+                  throw new Error()
+                } catch (e) {
+                  ;({ stack } = e as Error)
+                }
                 console.warn(
                   'Selector ' +
                     (selector.name || 'unknown') +
@@ -108,6 +114,7 @@ export function createSelectorHook(context = ReactReduxContext): UseSelector {
                     state,
                     selected,
                     selected2: toCompare,
+                    stack,
                   }
                 )
               }
@@ -120,11 +127,18 @@ export function createSelectorHook(context = ReactReduxContext): UseSelector {
             ) {
               // @ts-ignore
               if (selected === state) {
+                let stack: string | undefined = undefined
+                try {
+                  throw new Error()
+                } catch (e) {
+                  ;({ stack } = e as Error)
+                }
                 console.warn(
                   'Selector ' +
                     (selector.name || 'unknown') +
                     ' returned the root state when called. This can lead to unnecessary rerenders.' +
-                    '\nSelectors that return the entire state are almost certainly a mistake, as they will cause a rerender whenever *anything* in state changes.'
+                    '\nSelectors that return the entire state are almost certainly a mistake, as they will cause a rerender whenever *anything* in state changes.',
+                  { stack }
                 )
               }
             }

test/hooks/useSelector.spec.tsx

@@ -805,6 +805,7 @@ describe('React', () => {
                 }),
                 selected: expect.any(Number),
                 selected2: expect.any(Number),
+                stack: expect.any(String),
               })
             )
           })
@@ -920,7 +921,10 @@ describe('React', () => {
             )
 
             expect(consoleSpy).toHaveBeenCalledWith(
-              expect.stringContaining('returned the root state when called.')
+              expect.stringContaining('returned the root state when called.'),
+              expect.objectContaining({
+                stack: expect.any(String),
+              })
             )
           })
         })