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chrome.action.onClicked.addListener((tab) => {
  chrome.scripting.executeScript({
    target: {tabId: tab.id},
    files: ['content.js']
  });
});

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chrome.runtime.onMessage.addListener(async ({ name, options }) => {
  if (name === 'inject-programmatic') {
    await chrome.storage.local.set({ options });
    await chrome.tabs.create({
      url: 'https://example.com/#inject-programmatic'
    });
  }
});

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document
  .querySelector('#inject-programmatic')
  .addEventListener('click', async () => {
    const world = document.querySelector("[name='world']").value;
    chrome.runtime.sendMessage({
      name: 'inject-programmatic',
      options: { world }
    });
  });

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"content_scripts": [
  {
    "matches": ["https://*.udemy.com/*"],
    "js": ["dist/js/injector.js"],
    "run_at": "document_end"
  }
]

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let color = '#3aa757';

chrome.runtime.onInstalled.addListener(() => {
  chrome.storage.sync.set({ color });
});

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const path = require('path');

function resolve (dir) {
  return path.join(__dirname, '.', dir);
}

module.exports = function override(config) {
  config.resolve.alias = {
    ...config.resolve.alias,
    '@': resolve('src'),

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function Example() {
  // 宣告一個新的 state 變數，我們稱作為「count」。
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>

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import React from 'react';
import { mount } from 'enzyme';
import App from 'components/App';
import Root from 'root';
import moxios from 'moxios';

let wrapped;

beforeEach(() => {
    moxios.install();

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import commentsReducer from 'reducers/comments';
const SAVE_COMMENT = 'save_comment';

it('handles actions of type SAVE_COMMENT', () => {
    const action = {
        type: SAVE_COMMENT,
        payload: 'new comment'
    }

    const newState = commentsReducer([], action);

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const SAVE_COMMENT = 'save_comment';

export default(state = [], action) => {
    switch(action.type) {
        case SAVE_COMMENT:
            return [...state, action.payload]
        default:
            return state;
    }
}