make a new package for helpers

packages/helpers/convert-object-property-case.test.ts

@@ -0,0 +1,42 @@
+import type {
+  CamelCasedPropertiesDeep,
+  SnakeCasedPropertiesDeep,
+} from "type-fest"
+import { expect, test } from "vitest"
+import { camelCaseDeep, snakeCaseDeep } from "./convert-object-property-case"
+
+test("camelCaseDeep", () => {
+  const input = {
+    some_prop: {
+      some_deep_prop: "some_deep_value",
+    },
+    someOtherProp: "someOtherValue",
+  }
+
+  const expected: CamelCasedPropertiesDeep<typeof input> = {
+    someProp: {
+      someDeepProp: "some_deep_value",
+    },
+    someOtherProp: "someOtherValue",
+  }
+
+  expect(camelCaseDeep(input)).toEqual(expected)
+})
+
+test("snakeCaseDeep", () => {
+  const input = {
+    someProp: {
+      someDeepProp: "someDeepValue",
+    },
+    some_other_prop: "someOtherValue",
+  }
+
+  const expected: SnakeCasedPropertiesDeep<typeof input> = {
+    some_prop: {
+      some_deep_prop: "someDeepValue",
+    },
+    some_other_prop: "someOtherValue",
+  }
+
+  expect(snakeCaseDeep(input)).toEqual(expected)
+})