refactor: remove unused deepEqual function (#999)

Author: tatchi

src/core/tests/utils.test.tsx

@@ -1,9 +1,4 @@
-import {
-  deepEqual,
-  replaceEqualDeep,
-  deepIncludes,
-  isPlainObject,
-} from '../utils'
+import { replaceEqualDeep, deepIncludes, isPlainObject } from '../utils'
 import { setConsole, queryCache } from '..'
 import { queryKey } from '../../react/tests/utils'
 
@@ -66,26 +61,6 @@ describe('core/utils', () => {
     })
   })
 
-  describe('deepEqual', () => {
-    it('should return `true` for equal objects', () => {
-      const a = { a: { b: 'b' }, c: 'c', d: [{ d: 'd ' }] }
-      const b = { a: { b: 'b' }, c: 'c', d: [{ d: 'd ' }] }
-      expect(deepEqual(a, b)).toEqual(true)
-    })
-
-    it('should return `false` for non equal objects', () => {
-      const a = { a: { b: 'b' }, c: 'c' }
-      const b = { a: { b: 'c' }, c: 'c' }
-      expect(deepEqual(a, b)).toEqual(false)
-    })
-
-    it('return `false` for equal dates', () => {
-      const date1 = new Date(2020, 3, 1)
-      const date2 = new Date(2020, 3, 1)
-      expect(deepEqual(date1, date2)).toEqual(false)
-    })
-  })
-
   describe('replaceEqualDeep', () => {
     it('should return the previous value when the next value is an equal primitive', () => {
       expect(replaceEqualDeep(1, 1)).toBe(1)

src/core/utils.ts

@@ -140,10 +140,6 @@ export function getQueryArgs<TResult, TError, TOptions = undefined>(
   return [queryKey, config, options]
 }
 
-export function deepEqual(a: any, b: any): boolean {
-  return replaceEqualDeep(a, b) === a
-}
-
 /**
  * This function returns `a` if `b` is deeply equal.
  * If not, it will replace any deeply equal children of `b` with those of `a`.