@cara/porter-cli
Toolkit of Porter that helps browser modules development.
Last updated a month ago by dotnil .
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Porter CLI

Porter CLI is the command line interface of Porter the middleware. Web developers can use Porter CLI to spin up servers for two kinds of projects:

  • Standalone web applications that manage dependencies with NPM and consumes browser modules in Node.js fashion.
  • Isolated browser modules that share the same conveniency.

Porter CLI may be installed globally:

➜  ~ npm install @cara/porter-cli -g
➜  ~ cd /path/to/project
➜  ~ porter serve

or as one of the project's devDependencies:

➜  ~ cd /path/to/project
➜  ~ npm install @cara/porter-cli --save-dev
➜  ~ npx porter serve

Developing Web Application

Conventionally, the structure of web application should look like below:

➜  demo-cli git:(master) tree -L 2
.
├── components        # browser modules
│   ├── app.css
│   └── app.js
├── node_modules      # dependencies
│   ├── @cara
│   ├── jquery
│   └── prismjs
├── package.json
└── public
    └── index.html    # homepage

It's worth noting that the frontend code of the web application above is in the directory ./components, which is the default load paths for browser modules. To start the web app, the default settings shall suffice:

➜  demo-cli git:(master) npx porter serve
Server started at 5000

The equivalent command of the above is:

➜  demo-cli git:(master) npx porter serve --paths components --dest public --port 5000
Server started at 5000

Developing Browser Modules

Unlike web applications, when developing isolated browser modules (that is meant to be shared as an npm package), the code resides in package root rather than ./components. Take demo-component for example.

➜  demo-component git:(master) tree . -I node_modules
.
├── index.js
├── package.json
└── test
    └── suite.js

To start the server for this browser module, we need to change the default paths.

➜  demo-component git:(master) npx porter serve --paths .
Server started at 5000

A default /runner.html is provided as well, which use Mocha as the test framework. With test cases laid out in test/suite.js, developers may see the test run at http://localhost:5000/runner.html, which loads a built-in entry called /runner.js to start the process.

To run the test cases automatically at command line, just pass the --headless option.

➜  demo-component git:(master) npx porter serve --paths . --headless --suite test/suite.js

> @cara/demo-component@2.0.0-3 test /Users/nil/Projects/erzu/porter/packages/demo-component
> DEBUG=porter,$DEBUG porter serve --paths . --headless

Server started at 50106

  ✔ yen.fn.reveal() removeClass("hidden") (2ms)

  1 test completed (7ms)

Test Runner

Porter CLI has Mocha opt-in, which means with the default setup, we can start writing test cases right away. To take a quick look of this feature, we can start the server and visit http://localhost:5000/runner.html. Here's what happens:

  1. /runner.html loads mocha.js, the entry /runner.js?main (which has the loader bundled in).
  2. /runner.js sets up parameters of mocha, such as ui, reporter, and timeout, by calling mocha.setup({ ui, reporter, timeout }).
  3. /runner.js tries to load test/suite.js, which is the default entry of current package's test cases.
  4. mocha.run() at last.

As the developer of current package, no matter it's web application or browser module, the only thing to worry about here is how to put down meaningful test cases into test/suite.js. Take the test cases of demo-app for example, test/suite.js is just an entry of test cases.

We can override the default Mocha settings by search parameters, such as http://localhost:5000/runner.html?ui=tdd&timeout=60000.

As demostrated in browser module section, when test cases are ready and we need to put them up with Continuous Integration, we can call Porter CLI with the --headless option:

➜  ~ porter serve --headless

This puts Porter CLI in headless mode, which not only start the server, but also tries to open the test page and log the test results, in CLI. If test passes with zero failure, the command exits with 0. On the contrary, the command exits with the number of failures. This makes the headless mode suitable to be put in npm scripts:

{
  "name": "@cara/demo-component",
  "devDependencies": {
    "@cara/porter-cli": "^2.0.0-3"
  },
  "scripts": {
    "start": "porter serve --paths .",
    "test": "DEBUG=porter,$DEBUG porter serve --paths . --headless"
  }
}

Options

--dest=public

The destination directory which holds temporary files, compile results, and (if you wish) static files. The default destination directory is public.

➜  ~ porter serve --dest www
Server started at 5000

--headless

Pass this option to run Porter CLI in headless mode. In this mode, Porter CLI performs followin tasks step by step:

  1. Start an http server with the port randomly picked.
  2. Open the test page http://localhost:${port}/runner.html in puppeteer.
  3. Output everything the runner page logs, with test suites recognized.

If test suites pass, exit with code 0. Otherwise, exit with the number of failed test cases.

--paths

The load paths of current package. In regular npm packages, the load paths is .. In web applications, the load paths is at your command although components is the recommended and the default one.

We can setup multiple load paths by repeating the --paths option, such as:

# paths => ["components", "browser_modules"]
➜  ~ porter serve --paths components --paths browser_modules
Server started at 5000

--port

The port which the server started by Porter CLI listens to. The default is 5000.

When --headless option is on, this option is trumped.

--suite

The entry of test suites that /runner.html tries to load. By default, when visiting http://localhost:5000/runner.html, test/suite.js of current package will be tried to load. If loaded successfully, and test/suite.js did setup a few test cases, /runner.html shows the result.

If a different name is preferred, you may pass the name to --suite option, such as:

# test => tests
➜  ~ porter serve --suite tests/suite.js
Server started at 5000

--timeout

The timeout on test runner, which defaults to 15000.

# a minute
➜  ~ porter serve --timeout 60000
Server started at 5000

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