feat(withErrorIfNeeded): add new hoc for easier error handling

src/__tests__/withErrorIfNeeded.js

@@ -0,0 +1,60 @@
+import React from "react";
+import { compose } from "recompose";
+import { TextInput } from "react-native";
+import { mount } from "enzyme";
+
+import { withErrorNew as withErrorIfNeeded } from "../..";
+import withFormikMock from "../testUtils/withFormikMock";
+
+console.error = jest.fn();
+
+const TOUCHED_INPUT_NAME = "TOUCHED_INPUT_NAME";
+const TOUCHED_INPUT_ERROR = "TOUCHED_INPUT_ERROR";
+const UNTOUCHED_INPUT_NAME = "UNTOUCHED_INPUT_NAME";
+const UNTOUCHED_INPUT_ERROR = "UNTOUCHED_INPUT_ERROR";
+
+const formikContext = {
+  errors: {
+    [TOUCHED_INPUT_NAME]: TOUCHED_INPUT_ERROR,
+    [UNTOUCHED_INPUT_NAME]: UNTOUCHED_INPUT_ERROR
+  },
+  touched: {
+    [TOUCHED_INPUT_NAME]: true
+  },
+  submitCount: 0
+};
+const Input = compose(
+  withFormikMock(formikContext),
+  withErrorIfNeeded
+)(TextInput);
+
+const testInputError = (inputName, expectedError) => {
+  const input = mount(<Input name={inputName} />);
+  expect(input.find(TextInput).props().error).toEqual(expectedError);
+};
+
+describe("withError", () => {
+  it("displays error for all inputs if the form is submitted", () => {
+    formikContext.submitCount = 1;
+    testInputError(UNTOUCHED_INPUT_NAME, UNTOUCHED_INPUT_ERROR);
+    testInputError("valid input", undefined);
+  });
+
+  it("displays error for touched inputs if the form is not submitted", () => {
+    formikContext.submitCount = 0;
+    testInputError(UNTOUCHED_INPUT_NAME, undefined);
+    testInputError(TOUCHED_INPUT_NAME, TOUCHED_INPUT_ERROR);
+  });
+
+  it("keeps other props", () => {
+    const wrapper = mount(<Input name="inputName" someProp="someValue" />);
+    expect(wrapper.find(TextInput).props().someProp).toEqual("someValue");
+  });
+
+  it("allows overriding error prop", () => {
+    const erroredInput = mount(
+      <Input name={TOUCHED_INPUT_NAME} error="override!!" />
+    );
+    expect(erroredInput.find(TextInput).props().error).toEqual("override!!");
+  });
+});

src/withErrorIfNeeded.js

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+import { compose, mapProps } from "recompose";
+import { connect } from "formik";
+import withError from "./withError";
+import withTouched from "./withTouched";
+
+const withErrorIfNeeded = compose(
+  withError,
+  withTouched,
+  connect,
+  mapProps(({ formik: { submitCount }, error, touched, ...props }) => {
+    const shouldDisplayError = touched || submitCount > 0;
+
+    return {
+      touched,
+      error: shouldDisplayError ? error : undefined,
+      ...props
+    };
+  })
+);
+
+export default withErrorIfNeeded;