@tradie/node-package-template

A tradie template for creating packages that run on NodeJS.

Featuring:

• linting with eslint
• type checking with flow
• transpilation with babel
• testing with jest

Usage

1. Create a new package:

   npx --package @tradie/node-package-template tradie create

2. Build the files:

   yarn run build

3. Run the tests:

   yarn run test

4. Publish the package:

   yarn publish

Commands

tradie create

Create the package files.

tradie clean

Remove generated files.

Will remove files matching lib/** and coverage/**.

tradie lint

Lint source and test files.

tradie build [--watch]

Lint and transpile source files.

Will lint and transpile source files matching src/**/*.{js,jsx} and write the result to lib/. Will copy Flow types to lib/.

Will ignore test files, fixtures and mocks matching {src,test}/**/*.test.{js,jsx}, {src/test}/**/__mocks__/ or {src/test}/**/__fixtures__/.

tradie test [--watch] [--coverage]

Run test files.

Will run test files matching {src,test}/**/*.test.{js,jsx}.

How to

Setup Flowtype

1. Create the config file:

   • .flowconfig

   [ignore]
   
   # ignore transpiled code
   <PROJECT_ROOT>/lib
   
   

   You can learn more about configuring Flow here.

2. Install the types for jest:

   flow-typed install jest@^20 --flowVersion 0.48.0

   You can learn more about installing Flow types here.

3. Annotate your files:

   • src/index.js

   // @flow
   ...

   • src/index.test.js

   // @flow
   ...

   You can learn more about writing code for Flow here.

Write tests

1. Create a test file and write some assertions

   • src/index.test.js

   describe('lame example()', () => {
     it('should pass', () => {
       expect(true).toBeTruthy();
     });
   });

   You can learn more about writing assertions with Jest here.

   Jest provides mock functions and manual mock functions which are worth learning!

Customising the test environment

Occasionally you'll need to run some code to setup your test environment before running your tests. Jest will try running src/_.test.js and test/_.test.js before it runs your tests. You can place any necessary test setup in here.

e.g.

import {shallow} from 'enzyme';

//allow global access to `shallow()` in test files
// to avoid `import`ing it in every file
global.shallow = shallow;

Include other ty[es of files

1. Create a new directory for your files

   e.g. files/

2. Reference your files from your sources using require.resolve()

   e.g. fs.readFileSync(require.resolve('../files/data.txt'));

3. Update the files key in your package.json so NPM publishes the files in the package

   e.g. "files": ["lib", "files"],