1.2.0 • Public • Published


    This library can be used for managing server- and client-side configs.

    All configs are stored in .json files (see examples in sample-config) in a config folder in your working directory. This path can be overridden via the CALYPSO_CONFIG_PATH environment variable.

    At boot-up time, the server decides which config file to use based on the NODE_ENV environment variable. The default value is development. For values shared across environments, add them to the _shared.json file. Local-only values can be added via a {environment}.local.json file (e.g. development.local.json).

    The entire configuration is available on the server-side and certain keys can be exposed to the client.

    Server-side Usage

    Config values can be retrieved by invoking the config() exported function with the desired key name:

    import config from '@automattic/calypso-config';
    console.log( config( 'redirect_uri' ) );

    Client-side Usage

    To access config values on the client-side, add the property name to the client.json file, which is a whitelist of config properties that will be exposed to the client.

    A global configData object must also be output during the initial render. Here's an example using webpack and the interpolate

    In your webpack build config:

    const HtmlWebpackPlugin = require( 'html-webpack-plugin' );
    const InterpolateHtmlPlugin = require( 'react-dev-utils/InterpolateHtmlPlugin' );
    const clientData = require( '@automattic/calypso-config' ).clientData;
    // ...
    const interpolateHtmlData = Object.assign( {}, {
    	CALYPSO_CONFIG_DATA_AS_JSON: JSON.stringify( clientData ),
    } );
    // ...
    module.exports = {
    	// ...
    	plugins: [
    		new InterpolateHtmlPlugin( interpolateHtmlData ),
    		new HtmlWebpackPlugin( {
    			inject: true,
    			template: '/path/to/index.html',
    		} ),
    	// ...

    Then, in your index.html template:

      <script>var configData = %CALYPSO_CONFIG_DATA_AS_JSON%;</script>

    And finally, to access the configs:

    import config from '@automattic/calypso-config/client';
    console.log( config( 'redirect_uri' ) );
    console.log( config.isEnabled( 'secret-features' ) );

    Feature Flags

    The config files contain a features object that can be used to determine whether to enable a feature for certain environments. This allows us to merge in-progress features without launching them to production. The config module adds a method to detect this: config.isEnabled(). Please make sure to add new feature flags alphabetically so they are easy to find.

    	"features": {
    		"manage/posts": true,
    		"reader": true

    Testing Feature Flags Locally

    If you want to temporarily enable/disable some feature flags for a given build, you can do so by setting the ENABLE_FEATURES and/or DISABLE_FEATURES environment variables. Set them to a comma separated list of features you want to enable/disable, respectively:

    ENABLE_FEATURES=manage/plugins/compatibility-warning DISABLE_FEATURES=code-splitting,reader npm start

    Testing Feature Flags via URLs

    If you want to temporarily enable/disable some feature flags you can add a ?flags= query parameter to the URL.

    Note that this only works on development, staging, and calypso.live, not in production (this functionality is not suitable for public use on *.wordpress.com).

    • ?flags=foo enables feature foo.
    • ?flags=-bar disables feature bar.
    • ?flags=foo,-bar enables feature foo and disables feature bar.

    E.g. http://calypso.localhost:3000/?flags=manage/plugins/compatibility-warning




    npm i @automattic/calypso-config

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