# frint [![npm](https://img.shields.io/npm/v/frint.svg)](https://www.npmjs.com/package/frint) > The base of Frint - [Guide](#guide) - [Installation](#installation) - [Terminologies](#terminologies) - [Usage](#usage) - [Creating and registering apps](#creating-and-registering-apps) - [Understanding Providers](#understanding-providers) - [API](#api) - [App](#app) - [createApp](#createapp) - [app](#app-1) --- # Guide ## Installation With [npm](https://www.npmjs.com/): ``` $ npm install --save frint ``` Via [unpkg](https://unpkg.com) CDN: ```html ``` ## Terminologies * `Root App`: The top-most parent App, where other Apps get registered to. * `App`: Apps that register themselves to Root App. * `Provider`: Dependency for your apps. ## Usage Let's import the necessary functions from the library first: ```js const Frint = require('frint'); const { createApp } = Frint; ``` Now we can create our App: ```js const RootApp = createApp({ name: 'MyAppName' }); ``` Instantiate the Root app: ```js const app = new RootApp(); // now you have the Root app's instance // usually we set the root app to `window.app`, // so apps coming in from separate bundles can register themselves window.app = app; ``` ## Creating and registering apps ```js const { createApp } = Frint; const MyApp = createApp({ name: 'MyAppName' }); ``` To register the App in your Root App: ```js window.app.registerApp(MyApp); ``` ## Understanding Providers Providers are dependencies for your Frint application (not to be confused with `npm` packages). They can be set at Root app level, at App level, or even only at Root app level but cascade them to other Apps. ### Direct values For values that are already known: ```js const RootApp = createApp({ name: 'MyAppName', providers: [ { name: 'foo', useValue: 'foo value here' } ] }); const app = new RootApp(); app.get('foo') === 'foo value here'; ``` ### Generated values from factories If you want to get the value from a function (will be called only once during App construction): ```js const RootApp = createApp({ name: 'MyAppName', providers: [ { name: 'bar', useFactory: function () { return 'bar value'; } }, ] }); const app = new RootApp(); app.get('bar') === 'bar value'; ``` ### Classes You can also have classes defined as providers. They will be instantiated when the App is constructed, and then made available to you: ```js class Baz { getValue() { return 'baz value'; } } const RootApp = createApp({ name: 'MyAppName', providers: [ { name: 'baz', useClass: Baz } ] }); const app = new RootApp(); app.get('baz').getValue() === 'baz value'; ``` ### Cascading If you wish to cascade a provider from Root App to other Apps, you can: ```js const RootApp = createApp({ name: 'MyRootApp', providers: [ { name: 'window', useValue: window, // the global `window` object cascade: true, } ] }); const MyApp = createApp({ name: 'MyApp' }); const app = new RootApp(); app.registerApp(MyApp); app.get('window') === window; app.getAppInstance('MyApp').get('window') === window; ``` ### Reserved provider names * `app`: The current App in scope * `rootApp`: Always refers to the top-most App (which is Root) ### Dependencies Providers can also list their dependencies (by their names). ```js class Baz { constructor({ foo, bar, app }) { // I have access to both `foo` and `bar` here. // And I can access the scoped `app` instance too. } } const RootApp = createApp({ name: 'MyRootApp', providers: [ { name: 'foo', useValue: 'foo value' }, { name: 'bar', useFactory: function ({ foo }) { return `In bar, I have foo's value: ${foo}` }, deps: ['foo'] // value's of provider names listed here will be fed as arguments }, { name: 'baz', useClass: Baz, deps: ['foo', 'bar', 'app'] } ], }) ``` ### Scoped When cascading providers from Root to other Apps, it is likely you may want to scope those values by the App they are targeting. It is applicable in only `useFactory` and `useClass` usage, since they generate values. ```js const RootApp = createApp({ name: 'MyRootApp', providers: [ { name: 'theNameOfTheApp', useFactory: function ({ app }) { return app.app.getName(); }, deps: ['app'], cascade: true, scoped: true, } ] }); const MyApp = createApp({ name: 'MyApp' }); const app = new RootApp(); app.registerApp(MyApp); app.get('theNameOfTheApp') === 'MyRootApp'; app.getAppInstance('MyApp').get('theNameOfTheApp') === 'MyApp'; ``` --- # API ## App > App The base App class. ## createApp > createApp(options) ### Arguments 1. `options` (`Object`) * `options.name`: (`String` [required]): Name of your App. * `options.methods`: (`Object` [optional]): Object with the methods your App exposes on the instance level. * `options.initialize`: (`Function` [optional]): Called when App is constructed. * `options.beforeDestroy`: (`Function` [optional]): Called when App is about to be destroyed. * `options.providers`: (`Array` [optional]): Array of provider objects. ### Returns `App`: App class. ## app > const app = new App(); The `App` instance ### app.getOption > app.getOption(key) #### Arguments 1. `key` (`String`) #### Returns `Any`. #### Example `app.getOption('name')` would give you `MyAppName` string. ### app.getName > app.getName() #### Returns `String`: The App's name. ### app.getRootApp > app.getRootApp() #### Returns `App`: Gives you the Root App instance. ### app.getParentApp > app.getParentApp() #### Returns `App`: Gives you the immediate Parent App instance. ### app.getParentApps > app.getParentApps() ### Returns `Array`: Array of parent apps, with immediate parent app as first element and the root app being the last. ### app.getProviders > app.getProviders() Gives you an array of provider definitions as passed while creating the App class. #### Returns `Array`: Array of provider definitions as passed while creating the App class. ### app.getProvider > app.getProvider(name) Gives you the provider's original definition. #### Arguments 1. `name` (`String`): The name of the provider that you want #### Returns `Object`: The provider definition Not to be confused with the computed value of the provider. ### app.get > app.get(name) Gives you the computed value of the provider. #### Arguments 1. `name` (`String`): The name of the provider #### Returns `Any`: The computed value of the provider. ### app.getApps$ > app.getApps$(regionName = null) #### Arguments 1. `regionName` (`String` [optional]): Filter the list of apps by region names if needed #### Returns `Observable`: That emits an array of most recent available Apps. ### app.registerApp > app.registerApp(App, options = {}) Register App class to Root app. #### Arguments 1. `App` (`App`): The App class. 1. `options` (`Object` [optional]) * `name` (`String` [optional]): If the App's name needs to be overridden. * `multi` (`Boolean` [optional]): If the App is a multi-instance app (defaults to `false`) #### Returns `void` ### app.hasAppInstance > app.hasAppInstance(name, region = null, regionKey = null) Check if App instance is available or not. #### Arguments 1. `name` (`String`): The name of the App that you are looking for 1. `region` (`String` [optional]): If you want the App of a specific region 1. `regionKey` (`String` [optional]): If it is a multi-instance App, then the lookup can be scoped by region's keys. #### Returns `Boolean`: A flag indicating whether an App instance whose name matches the provided `name` parameter is available or not ### app.getAppInstance > app.getAppInstance(name, region = null, regionKey = null) Gets the App instance if available. #### Arguments 1. `name` (`String`): The name of the App that you are looking for 1. `region` (`String` [optional]): If you want the App of a specific region 1. `regionKey` (`String` [optional]): If it is a multi-instance App, then the lookup can be scoped by region's keys. #### Returns `App|Boolean`: The app instance, or false if not availble. ### app.getAppOnceAvailable$ > app.getAppOnceAvailable$(name, region = null, regionKey = null) Returns an Observable, which emits with the App's instance once it is available. #### Arguments 1. `name` (`String`): The name of the App that you are looking for 1. `region` (`String` [optional]): If you want the App of a specific region 1. `regionKey` (`String` [optional]): If it is a multi-instance App, then the lookup can be scoped by region's keys. #### Returns `Observable`: Emits the App instance once found, only once. ### app.instantiateApp > app.instantiateApp(name, region = null, regionKey = null) Instantiates the registered App class, (for the targetted region/regionKey if it is a multi-instance App). #### Arguments 1. `name` (`String`): The name of the App that you are looking for 1. `region` (`String` [optional]): If you want the App of a specific region 1. `regionKey` (`String` [optional]): If it is a multi-instance App, then the lookup can be scoped by region's keys. #### Returns `Array`: The updated collection of apps. ### app.destroyApp > app.destroyApp(name, region = null, regionKey = null) Destroys App instance. #### Arguments 1. `name` (`String`): The name of the App that you are looking for 1. `region` (`String` [optional]): If you want the App of a specific region 1. `regionKey` (`String` [optional]): If it is a multi-instance App, then the lookup can be scoped by region's keys. #### Returns `void`.

	Stars	Issues	Version	Updated	Created
@luigi-project/core			2.12.0	a day ago	4 years ago
frint	751	61	5.7.2	6 years ago	8 years ago
oc	1,403	24	0.49.53	23 days ago	9 years ago
piral	1,626	11	1.5.4	11 days ago	5 years ago
single-spa	13,048	52	6.0.1	2 months ago	9 years ago

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