Chrome i18n testing shim

This project is an attempt to mimic the chrome.i18n.getMessage function for testing. It's easy to stub out getMessage with something like jest.fn but we actually want to mimic the implementation so we can verify tokens.

Setup

Install the dependency

yarn add -D chrome-extension-i18n-shim

In a Jest setup file (when used in conjunction with jest-webextension-mock):

// jest.setup.js
import { setupGetMessageSim } from 'chrome-extension-i18n-shim';
// We want to load our default translations into our tests. See: https://twitter.com/kentcdodds/status/1181591171518230528
import * as enMessages from './_locales/en/messages.json';

const getMessage = setupGetMessageSim(enMessages);

global.chrome = {
  ...global.chrome,
  i18n: {
    ...global.chrome.i18n,
    getMessage: getMessage,
  },
};

Local Development

Below is a list of commands you will probably find useful.

npm start or yarn start

Runs the project in development/watch mode. Your project will be rebuilt upon changes. TSDX has a special logger for you convenience. Error messages are pretty printed and formatted for compatibility VS Code's Problems tab.

Your library will be rebuilt if you make edits.

npm run build or yarn build

Bundles the package to the dist folder. The package is optimized and bundled with Rollup into multiple formats (CommonJS, UMD, and ES Module).

npm test or yarn test

Runs the test watcher (Jest) in an interactive mode. By default, runs tests related to files changed since the last commit.