proposal-import-attributes
custom-elements-everywhere
proposal-import-attributes | custom-elements-everywhere | |
---|---|---|
9 | 19 | |
555 | 1,156 | |
2.0% | 1.8% | |
5.9 | 8.7 | |
5 months ago | 1 day ago | |
HTML | JavaScript | |
Apache License 2.0 | GNU General Public License v3.0 or later |
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proposal-import-attributes
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The long path of JavaScript - from ES6 until today.
The proposal for import attributes aims to improve the import statement in JavaScript by allowing developers to assert certain conditions about the imported module. This can help catch errors at compile-time instead of runtime and make the code more robust. Currently this proposal is in Stage 3.
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Power of Partial Prerendering with Bun
Bun introduces the idea of Macros into JavaScript. Macros are a new paradigm that allows optimizations ahead of time just by adding an import attribute.
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How to use import attributes in TypeScript and JavaScript
TypeScript v5.3 builds on its JavaScript foundation by adding import attributes with the usual type safety and tooling benefits inherent to the language. You can follow the TypeScript proposal for import attributes on GitHub.
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CSS Modules Still a Thing?
Yup, in vanilla that's fine, but I'm not sure whether bundlers etc are able to understand import assertions yet, as the spec is still being finalised - for example: the 'assert' keyword has now been officially changed to 'with', but only 'assert' is implemented anywhere at the moment.
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If Web Components are so great, why am I not using them?
Things like HTML (and JSON) imports in ES modules, among other things, have been waiting on some safety signalling mechanics currently named "Import Attributes". Import Attributes are currently in Stage 3 [0].
The basic security story is that browsers never care about file extensions, they care about MIME types. A developer might add an import to a third-party HTML or JSON file somewhere and expect one "safe" behavior, but the third-party could just return a MIME type of "text/javascript" and inject an entire script and the browser is supposed to respect that MIME type.
To keep things safe, browsers want a way to signal that an import is supposed to JSON (or HTML or CSS) rather than JS and error if it gets back something "wrong" from a server request. That's one of the proposed uses for Import Attributes to suggest expected MIME types for non-JS modules in ES module imports.
Unfortunately, there are other proposed uses for Import Attributes (things like including hashes for integrity checks) and so there have been quite a few revisions (and multiple names) for Import Attributes trying to best support as many of the proposed uses as possible, and that has slowed progress on it a lot more than some people would wish.
[0] https://github.com/tc39/proposal-import-attributes
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[Showoff Saturday] Replacing Abandoned Dependencies
This was an idea that I came up with when thinking about how to handle import styles from './styles.css' with { type: 'css' } in @shgysk8zer0/rollup-import. Import assertions / import attributes are now back to stage 3, but only JSON is actually progressing. So I decided to wait until there's a stable spec.
- Rails Frontend Bundling - Which one should I choose?
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The Cost of Convenience
None of these examples will actually work in a browser, because they are non-standard. Some of you might have correctly spotted that a browser standard exists for two of the imports pointed out in the example, namely the Import Attributes proposal (previously known as Import Assertions), but these imports in their current shape will not work natively in a browser. Many of these non-standard imports exist for good reason; they are very convenient.
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Updates from the 95th TC39 meeting
import attribute: Import Assertions re-adanced to Stage-3. Proposal for syntax to import ES modules with assertions
custom-elements-everywhere
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Unlocking the frontend – a call for standardizing component APIs pt.2
With React (it seems) finally moving to support everything needed (they are the last major framework lagging behind substantially), too, we might be moving to a world post-framework discussions, and real interoperability on a technical level. I think Jake Lazaroff motivates this beautifully with his articles “Web Components Eliminate JavaScript Framework Lock-in” and “The Web Component Success Story”.
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Use web components for what they’re good at
Seems it doesn’t work in React, everything is sent as a string. There was a link in the article that shows how well web components work with various frameworks.
https://custom-elements-everywhere.com/
You can see how React fares for itself.
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If Web Components are so great, why am I not using them?
React supports Web Components, just some quirks to be aware of: https://custom-elements-everywhere.com/
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[AskJS] Asking advice on monorepo setup with multiple frameworks
You could wrap each component as a Web Component and then import them for each repo. Web Components are not native to frameworks, so the support for them could vary when passing props. Or you could wrap the render method of each framework as a function and then use the receiving frameworks life cycle method and inject it onto the page. If you use frameworks like Svelte or Lit that are "Web Component" based, then you'd need to see if the receiving framework supports Web Components inorder to import the seamlessly.
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Am I the only one that thinks that the direction of React is wrong?
Check compatibility of React with web components: https://custom-elements-everywhere.com/ It's not directly because of jsx, but because of synthetic "let's make it up" approach of React.
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Regarding converting svelte file into pure js file
I have been using this approach recently as well, working great thus far ! Some things to consider though: - I would recommend checking if the other frameworks you intend to use have good web components support (looking at you, react): https://custom-elements-everywhere.com/ - There are ways to do so without web components, but I wouldn't recommend them unless your framework has poor web components support.
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HTML with Superpowers: An Introduction to Web Components
VueJS actually fails some advanced tests for WebComponents: https://custom-elements-everywhere.com/
So, VueJS docs are actually incorrect when they say it scores 100%. The actual score is 90%.
I had reported this 8 months ago.
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Building Web Components 101 - Part 1
Since Web Components are supported natively by browsers, they can be used in any libraries and frameworks either directly or with configurations. https://custom-elements-everywhere.com/ is a great site to check custom elements support status by different libraries and frameworks.
- Check if a library/framework supports the usage of custom elements
- custom-elements-everywhere.com: Check if a library/framework supports the usage of custom elements
What are some alternatives?
proposal-class-method-parameter-decorators - Decorators for ECMAScript class method and constructor parameters
stencil - A toolchain for building scalable, enterprise-ready component systems on top of TypeScript and Web Component standards. Stencil components can be distributed natively to React, Angular, Vue, and traditional web developers from a single, framework-agnostic codebase.
unpkg - The CDN for everything on npm
hybrids - Extraordinary JavaScript UI framework with unique declarative and functional architecture
proposal-float16array - a proposal to add float16 TypedArrays to JavaScript
details-dialog-element - A modal dialog that's opened with <details>.
proposal-await-dictionary - A proposal to add Promise.ownProperties(), Promise.fromEntries() to ECMAScript
web-vitals - Essential metrics for a healthy site.
uibuilder - Typed HTML templates using TypeScript's TSX files
declarative-shadow-dom - Declarative Shadow DOM feature development
custom-elements - Using custom elements
feelback-integrations - Feelback SDKs, integrations libraries and samples