Unit tests for data equality comparison

packages/db/package.json

@@ -52,6 +52,7 @@
     "typescript": ">=4.7"
   },
   "devDependencies": {
+    "@tanstack/config": "^0.22.2",
     "@vitest/coverage-istanbul": "^3.2.4",
     "arktype": "^2.1.28",
     "mitt": "^3.0.1",

packages/db/tests/query/compiler/evaluators.test.ts

@@ -506,6 +506,36 @@ describe(`evaluators`, () => {
             }
           })
 
+          it(`handles eq with Date objects (should compare by getTime(), not reference)`, () => {
+            // Create two Date objects with the same time value
+            // They are different object instances but represent the same moment
+            const date1 = new Date(`2024-01-15T10:30:45.123Z`)
+            const date2 = new Date(`2024-01-15T10:30:45.123Z`)
+
+            // Verify they are different object references
+            expect(date1).not.toBe(date2)
+            // But they have the same time value
+            expect(date1.getTime()).toBe(date2.getTime())
+
+            const func = new Func(`eq`, [new Value(date1), new Value(date2)])
+            const compiled = compileExpression(func)
+
+            // Should return true because they represent the same time
+            // Currently this fails because eq() does referential comparison
+            expect(compiled({})).toBe(true)
+          })
+
+          it(`handles eq with Date objects with different times`, () => {
+            const date1 = new Date(`2024-01-15T10:30:45.123Z`)
+            const date2 = new Date(`2024-01-15T10:30:45.124Z`) // 1ms later
+
+            const func = new Func(`eq`, [new Value(date1), new Value(date2)])
+            const compiled = compileExpression(func)
+
+            // Should return false because they represent different times
+            expect(compiled({})).toBe(false)
+          })
+
           it(`handles eq with Uint8Arrays created with length (repro case)`, () => {
             // Reproduction of user's issue: new Uint8Array(5) creates [0,0,0,0,0]
             const array1 = new Uint8Array(5) // Creates array of length 5, all zeros