Have you ever heard of ‘Shims’?
Conventionally speaking, shim means a thin piece of material used for filling small gaps or spaces between objects. Typically these are used to provide better support and fit to an existing structure. In the tech world, ‘shim‘ has been used to refer to polyfills or libraries that help a particular software/code support a newer environment.
In this blog we are going to talk a bit more of tech and share about ‘Project Shims’ in the context of ui5 tooling.
Shims in UI5
If you are aware about UI5 (OpenUI5/SAPUI5), then you already know that UI5 provides us a powerful development toolkit for developing apps. But it can’t provide everything and also it should not re-invent everything which already exists. Every framework solves this problem by using third party tools. Some of the popular examples are bootstrap library for responsive UI, lodash for JS utility functions, d3 for charts and diagrams etc. These third party libraries are shims which will help UI5 framework for building better apps.
- Using CDN script in index.html of the UI5 application.
- Downloading the library files and loading it in project.
A project shim extension can be used to define or extend a project configuration of a module. The most popular use case is probably to add UI5 project configuration to a third party module that otherwise could not be used with the UI5 Tooling.
The below part of blog assumes that you have a basic understanding about ui5-tooling and yarn. If not, then go through UI5 Tooling documentation and yarn documentation.
(1) Preparing a sample UI5 project:
If you don’t have a ui5-tooling based project with you, then just follow the below steps:
- Clone or download UI5 boilerplate project from ‘https://github.com/integrtr/ui5-boilerplate‘
- Install project dependencies using
yarn startto start local development server. Once started you would be able to view your app running in default browser at http://localhost:8080
Voila! We have our ui5-starter-app built with the new ui5-tooling ready !
(2) Enhancing with NPM packages
momentjs to our current project. You can do so by running the below commands in your terminal:
yarn add lodash yarn add moment
UI5 tooling needs all dependencies to be maintained in
ui5 > dependencies section of
Package.json. Lets add that configuration to our
Package.json. Below is how your final
Package.json file should look like.
Tip: You can verify your dependencies using
ui5 treecommand in the terminal
Now new modules should be maintained in
ui5.yaml file. This can be done using UI5 tooling extension project-shim. At the end of your
ui5.yaml file below code should be placed. Since we are adding a project extension, below code should be separated by new line with 3 dashes (- – -)
--- specVersion: '2.1' kind: extension type: project-shim metadata: name: thirdparty # this can be your project shim name shims: configurations: lodash: # name as defined in package.json specVersion: '2.1' type: module # Use module type metadata: name: lodash resources: configuration: paths: /resources/thirdparty/lodash/: '' # location where modules are stored moment: # name as defined in package.json specVersion: '2.1' type: module # Use module type metadata: name: moment resources: configuration: paths: /resources/thirdparty/moment/: '' # location where modules are stored
/resources/thirdparty/lodash will be the location inside dist folder where your modules will be stored. Location inside
/resources/ folder can be customized further similar to
/resources/<custom_folder_path>/. Same path will be used in
component file to import node modules.
Now we have our NPM modules and that should be imported in project. These can be imported in any JS file such as component or controller files. If you are using some package globally and need it as soon as you load application, then it is better to require in
Component.js, otherwise it can be required in any controllers file.
Below is a sample controller file where we are using
momentjs for demonstration purpose.
While importing you need to use the same path which was provided in
ui5.yaml file after omitting
lodash.js is the file inside
lodash folder. If you are having confusion with file name you can always build project using
yarn build-all to view folder structure and find file name.
That’s it! Now go ahead and include your favorite
npm packages inside your UI5 projects and make use of amazing third party libraries to build your awesome UI5 applications.