ajcrites

import { useContext } from 'react';
import parse from 'parse-color';

import { ColorAppContext } from '~/ColorApp';

export function useColor() {
  const { hex, rgba, setHex, setRgba } = useContext(ColorAppContext);

  const updateHex = hexValue => {
    const { hex, rgba } = parse(hexValue);

ajcrites

import React from 'react';
import { render, fireEvent, cleanup } from 'react-testing-library';

import { ColorToolContext } from '~/ColorToolContext';
import { updateHex } from '~/colorReducer';
import { HexInput } from '../HexInput';

describe('HexInput component', () => {
  test('dispatch updated hex value when input changes', () => {
    const testHex = '#abcef';

ajcrites

import { colorReducer, updateHex } from '../colorReducer';

describe('colorReducer', () => {
  test('update color with valid hex', () => {
    const initialState = {};
    const testHex = '#abcdef';

    const newState = colorReducer(initialState, updateHex(testHex));

    expect(newState).toEqual({

ajcrites

@@ -13,7 +13,7 @@ export const ColorInput = () => {
   }, []);

   const onChange = ({ target: { value } }) => {
-    dispatch({ type: 'UPDATE_HEX', payload: value })
+    dispatch(updateHex(value));
   };

   return show ? (

ajcrites

@@ -1,5 +1,5 @@
 export const ColorInput = () => {
-  const { hex, setHex, setRgba } = useContext(ColorToolContext);
+  const { hex, dispatch } = useContext(ColorToolContext);
   const input = useRef(null);

   const [show, setShow] = useState(true);
@@ -13,8 +13,7 @@ export const ColorInput = () => {
   }, []);

ajcrites

@@ -1,20 +1,25 @@
-import React, { useState, createContext } from 'react';
+import React, { useReducer, createContext, Dispatch } from 'react';

 import { HexInput } from '~/HexInput';
 import { RgbaInput } from '~/RgbaInput';
+import { colorReducer } from '~/colorReducer';

 interface ColorContextProps {
   hex: string;

ajcrites

import parse from 'parse-color';

export function colorReducer(state = {}, action): ColorContextProps {
  switch (action.type) {
    case 'UPDATE_HEX': {
      let nextState = { ...state };
      const hexColor = action.payload;
      if (/^#[a-f0-9]{6}$/i.test(hexColor)) {
        const { hex, rgba } = parse(action.payload);
        nextState = {

ajcrites

 interface ColorContextProps {
   hex: string;
   rgba: number[];
-
-  setHex: (value) => void;
-  setRgba: (value) => void;
 };

 const ColorContext = createContext<ColorContextProps>({} as any);

ajcrites

@@ -10,7 +10,7 @@ export const ColorInput = () => {
   useEffect(() => {
     input.current.value = '!';
     if ('!' === input.current.value) {
       setShow(false);
     }
-  });
+  }, []);

   const onChange = ({ target: { value } }) => {

ajcrites

export const ColorInput = () => {
  const { hex, setHex, setRgba } = useContext(ColorToolContext);
  const input = useRef(null);

  const [show, setShow] = useState(true);

  useEffect(() => {
    input.current.value = '!';
    // input[type=color] is not supported
    if ('!' === input.current.value) {