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| # 🌐 svelte-web-components-template | ||
| # 🔎 samply.lens 🔍 | ||
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| > A base template for building a shareable web components library using [Vite](https://vitejs.dev), [Svelte 4](https://svelte.dev) and [TypeScript](https://www.typescriptlang.org). | ||
| samply.lens is a front-end library, that provides common functionalities necessary for building search-, exploration and visualization applications. The primary target of this library is to deliver a good amount of building blocks, while also being open to user specific extensions. | ||
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| This templates generates vanilla [web components](https://developer.mozilla.org/en-US/docs/Web/Web_Components) that can be used with [plain HTML](https://www.webcomponents.org/introduction#how-do-i-use-a-web-component-) or within any major frameworks, such as React, Angular, Vue or Svelte (see [compatibility](https://custom-elements-everywhere.com/)). | ||
| ## Important Notice | ||
| The library is currently undergoing a change in the technological stack. Because of this, the current api is not completly finalized and is subject to changes in the next months. | ||
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| It is based on [sinedieds](https://github.com/sinedied/svelte-web-components-template) version for Svelte 3 and shows a simple solution of two components using the same store. | ||
| Our main reasons for doing a complete rewrite of the samply.lens are that we wanted to make the provided components more adjustable for users and allow an framework independent usage. Because of this, we switched from writting a [PrimeNG](https://www.primefaces.org/primeng) based [Angular](https://angular.io/) component library, to writting a web components library based on [Svelte](https://svelte.dev/) and plain CSS. | ||
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| ## How to use this template | ||
| The old version of the library, will be no longer maintained. If you want to take a look at the source code, you can still find it [here](https://github.com/samply/lens-angular). | ||
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| You can directly create a new GitHub repo from this template by selecting the **Use this template** button on GitHub. | ||
| ## Development Setup | ||
| If you want to setup a development environment for the samply.lens library, you will need a recent version of [Node.js and npm](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm) installed on your system. | ||
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| You can also clone it locally with the following commands: | ||
| After that, you will need to clone this repository | ||
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| ```bash | ||
| npx degit https://github.com/matsjohansen87/svelte_4_web_component_library_boilerplate#main my-component-lib | ||
| cd my-component-lib | ||
| npm install | ||
| ``` | ||
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| Your components source code lives in `lib/` folder. Only components with the `.wc.svelte` extension will be exported as web components and available in your library. This means that you can also use regular Svelte components with the `.svelte` extension as child components for your implementation details. | ||
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| You can add additional components by adding them to the `lib` folder and editing `lib/index.js`. | ||
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| ## Testing your components | ||
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| You can start a development server with: | ||
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| ```bash | ||
| npm start | ||
| ``` | ||
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| Then open your browser to [localhost:5173](http://localhost:5173). | ||
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| This will build the demo application located in the `demo/` folder, in which you can use and test your web components during development. | ||
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| If you need unit tests, you can take a look at [Jest](https://jestjs.io) and [Jest testing library](https://github.com/testing-library/svelte-testing-library). | ||
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| ### Using the built web components with the demo app | ||
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| The demo application is provided for development and testing of your components, that's why it imports the `.svelte` files from the `lib/` folder directly by default. | ||
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| If you prefer, you can import the built web components from the `dist/` folder instead, by editing `demo/src/App.svelte` and replacing the `import '../../lib';` statement with `import '../../../dist/lib';` if you have the `bundleComponents` option enabled, or individually import your components with `import import '../../dist/MyComponent.wc.js';` otherwise. | ||
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| You'll also have to make sure to run the `npm run build` script to generate the `dist/lib/` folder first. | ||
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| ## Building the library | ||
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| The command `npm run build` will create the web components library in the `dist/lib/` folder. It creates both an ES module (`dist/lib/<your-lib>.js`) suitable for bundler (non-minified), a minified ES module (`dist/lib/<your-lib>.min.js`) and a regular UMD script (`dist/lib/<your-lib>.umd.js`). | ||
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| The build is automatically called when executing `npm publish` to distribute your library, thanks to the `prepublishOnly` script entry in `package.json`. | ||
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| ## Notes and limitations | ||
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| This template does not provide any web components polyfills for older browsers support. It's usually best to leave that task to the host application, hence why they're left out. | ||
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| ### Props | ||
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| Any props accepted by your web component are automatically transformed to element attributes. Since camelCase or PascalCase does not work in HTML, you have to make sure to name your props in lowercase. | ||
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| ```html | ||
| <script> | ||
| export let myvalue = "Default"; | ||
| </script> | ||
| ``` shell | ||
| git clone https://github.com/samply/lens.git | ||
| ``` | ||
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| ### Events | ||
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| The Svelte syntax event for listening to events like `on:myevent` doesn't work with events dispatched from a Svelte web component ([#3119](https://github.com/sveltejs/svelte/issues/3119)). | ||
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| You need to use a workaround for that, by creating a `CustomEvent` and dispatching it. | ||
| and then install all dependencies with npm. | ||
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| Here's an example: | ||
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| ```html | ||
| // MyComponent.wc.svelte | ||
| <svelte:options tag="my-component" /> | ||
| <script> | ||
| import { get_current_component } from "svelte/internal"; | ||
| const component = get_current_component(); | ||
| // example function for dispatching events | ||
| const dispatchEvent = (name, detail) => | ||
| component.dispatchEvent(new CustomEvent(name, { detail })); | ||
| </script> | ||
| <button on:click={() => dispatchEvent("test", "Hello!")}> | ||
| Click to dispatch event | ||
| </button> | ||
| ``` shell | ||
| npm install | ||
| ``` | ||
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| ## Building each component into its own module | ||
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| By default this template will build all components into a single module. | ||
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| If you prefer to build each component into its own module, you can do so by setting the environment variable `BUNDLE_COMPONENTS` to `false`, or editing `vite.config.js` and setting the `bundleComponents` option to `false`. | ||
| With this, you can now run | ||
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| Then you also need to replace the content of `packages/lib/index.ts` with: | ||
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| ```js | ||
| export default () => { | ||
| import('./MyComponent.wc.svelte'); | ||
| // Import each of your component this way | ||
| }; | ||
| ``` shell | ||
| npm start | ||
| ``` | ||
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| This will enable code-splitting and will generate an ES module for each component in the `dist/lib/` folder. | ||
| to start a development server, that will typically be available at [http://localhost:5173](http://localhost:5173). For further available npm scripts, you can review the [package.json](./package.json) | ||
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| As you changed the way components are exported, you also need to replace the `import '../../lib';` statement in `demo/src/App.svelte` to `import '../../lib/MyComponent.wc.svelte';`. | ||
| ## Roadmap | ||
| - On a short term, we plan on publishing the library on [npmjs](https://www.npmjs.com/). We plan to make it available as [@samply/lens](https://www.npmjs.com/package/@samply/lens) | ||
| - After making the library available on npm, we will move the `AppCCP.svelte`, `AppBBMRI.svelte` and `AppGBA.svelte` to their separate repositories that are just using this library. | ||
| - On the long term, we plan to stabilize the api and configuration options the library offers and will document them here. | ||
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| ## Why enable `allowJs` in the TS template? | ||
| ## Build With | ||
| - [Svelte](https://svelte.dev/) | ||
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| While `allowJs: false` would indeed prevent the use of `.js` files in the project, it does not prevent the use of JavaScript syntax in `.svelte` files. In addition, it would force `checkJs: false`, bringing the worst of both worlds: not being able to guarantee the entire codebase is TypeScript, and also having worse typechecking for the existing JavaScript. In addition, there are valid use cases in which a mixed codebase may be relevant. | ||
| ## License | ||
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| Copyright 2019 - 2023 The Samply Community | ||
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| ## Why is HMR not preserving my local component state? | ||
| Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at | ||
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| HMR state preservation comes with a number of gotchas! It has been disabled by default in both `svelte-hmr` and `@sveltejs/vite-plugin-svelte` due to its often surprising behavior. You can read the details [here](https://github.com/sveltejs/svelte-hmr/tree/master/packages/svelte-hmr#svelte-hmr). | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
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| If you have state that's important to retain within a component, consider creating an external store which would not be replaced by HMR. | ||
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| ```ts | ||
| // store.ts | ||
| // An extremely simple external store | ||
| import { writable } from 'svelte/store' | ||
| export default writable(0) | ||
| ``` | ||
| Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. |
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