@eik/client

Eik Node Client

The Eik Node.js client facilitates switching between local and production assets in Node.js apps based on values provided by an assets.json metafile.

Install

npm install @eik/client

Basic usage

include the client in your node apps

const Client = require('@eik/client');

in production mode the client will build an object pointing to production assets

The client will read your local assets.json file and build a object based on the values found therein.

const client = new Client();

// client.js will be an object of the form:
/* 
[
    { type: 'module', value: 'http://<asset server>/finn/js/my-app/1.0.0/main/index.js' },
    { type: 'iife', value: 'http://<asset server>/finn/js/my-app/1.0.0/ie11/index.js' },
]
*/

// client.css will be an object of the form:
/*
[
    { type: 'text/css', value: 'http://<asset server>/finn/css/my-app/1.0.0/index.css' }
]
*/

In both cases, each object in the array also has a toHTML() method that can be used to render out the appropriate HTML tag for the object.

const client = new Client();

client.js[0].toHTML();
// <script type="module" src="http://<asset server>/finn/js/my-app/1.0.0/main/index.js"><script>

client.js[1].toHTML();
// <script src="http://<asset server>/finn/js/my-app/1.0.0/ie11/index.js"><script>

client.css[0].toHTML();
// <link rel="stylesheet" type="text/css" href="http://<asset server>/finn/js/my-app/1.0.0/main/index.css">

in development mode the client will build an object pointing to development assets provided

const client = new Client({ js: '/assets/scripts.js', css: '/assets/styles.css' development: true });

// client.js will be an array of the form [{ type: 'module', value: '/assets/script.js' }]
// client.css will be an array of the form [{ type: 'text/css', value: '/assets/styles.css' }]

It's up to you to make sure that these assets are available to the app. In an express app you might use express-static to serve the assets with your app

Example: Express app using express-static

app.use('/assets', express.static('assets'));

const client = new Client({
    js: '/assets/scripts.js',
    css: '/assets/styles.css'
    development: true
});

Or you might use webpack or some other bundling system that can also serve the assets in development mode for you (remembering to set appropriate CORS headers)

Example: Setup when using Webpack dev server

const client = new Client({
    js: 'http://localhost:8080/scripts.bundle.js',
    development: true,
});

Or you might just use an HTTP server to serve your files on a port such as 4000. (remembering to set appropriate CORS headers)

Example: Setup when using a standalone web server

const client = new Client({
    js: 'http://localhost:4000/assets/scripts.js',
    css: 'http://localhost:4000/assets/styles.css'
    development: true
});

API

Client

new Client(opts);

Creates a new instance of the client. Created instance have the accessor properties .js and .css as described below.

opts

name	description	type	default	required
development	switches the client between development and non development modes	boolean	false	false
path	modifies the default path to the assets.json meta file	string	./assets.json	false
js	URL or path to location of JavaScript assets to be used in development mode. An object can also be passed for additional configuration	`string	object`
css	URL or path to location of CSS assets to be used in development mode. An object can also be passed for additional configuration	`string	object`

Example

const client = new Client({
    path: './some/other/assets.json',
    development: true,
    js: '/assets/scripts.js',
    css: '/assets/styles.css',
});

Example

const client = new Client({
    development: true,
    js: { value: '/assets/scripts.js', type: 'module', async: true },
    css: { value: '/assets/styles.css', type: 'text/css' },
});

client.js

Returns an array of JavaScript asset objects for the given mode (development or non development) based on values in assets.json As asset object can be serialized using JSON.stringify or converted into an HTML script tag using the method .toHTML()

Examples

client.js; // [{ type: 'module', value: 'http://<asset server>/finn/js/my-app/1.0.0/index.js' }]

client.js[0].toHTML(); // <script type="module" src="http://<asset server>/finn/js/my-app/1.0.0/index.js">

client.css

Returns an array of CSS asset objects for the given mode (development or non development) based on values in assets.json As asset object can be serialized using JSON.stringify or converted into an HTML link tag using the method .toHTML()

Example

client.css; // [{ type: 'default', value: 'http://<asset server>/finn/css/my-app/1.0.0/index.css' }]

client.css[0].toHTML(); // <link type="text/stylesheet" rel="stylesheet" href="http://<asset server>/finn/css/my-app/1.0.0/index.css">

client.scripts

Returns JavaScript script tag markup for the given mode (development or non development) based on values in assets.json

Examples

client.scripts;
// <script src="http://localhost:4001/my-org/pkg/my-app-name/1.0.0/main/index.js" type="module"></script>
// <script src="http://localhost:4001/my-org/pkg/my-app-name/1.0.0/ie11/index.js"></script>`

client.styles

Returns CSS link tag markup for the given mode (development or non development) based on values in assets.json

Examples

client.styles;
// <link href="http://localhost:4001/my-org/pkg/my-app-name/1.0.0/main/index.css" type="text/css" rel="stylesheet">