es-module-shims
Angular
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es-module-shims | Angular | |
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13 | 699 | |
1,481 | 94,541 | |
- | 0.9% | |
6.5 | 10.0 | |
9 days ago | about 16 hours ago | |
JavaScript | TypeScript | |
MIT License | MIT License |
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es-module-shims
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ā° Itās time to talk about Import Map, Micro Frontend, and Nx Monorepo
For full compatibility and extra features, we usually use the library es-module-shims.
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JavaScript import maps are now supported cross-browser
You can polyfill for unsupported browsers, it works surprisingly well: https://github.com/guybedford/es-module-shims
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Modern SPAs without bundlers, CDNs, or Node.js
https://github.com/guybedford/es-module-shims has a polyfill. (But it is fairly large: 53KB raw, 15KB gzipped, 32KB minified, 11KB minified+gzipped. Itās providing a lot of likely-unnecessary functionality. Iād prefer a stripped-down polyfill that can also be lazily-loaded, controlled by a snippet of at most a few hundred bytes that you can drop into the document, only loading the polyfill in the uncommon case that itās neededālike how five years ago as part of modernising some of the code of Fastmailās webmail, I had it fetch and execute core-js before loading the rest iff !Object.values (choosing that as a convenient baseline), so that the cost to new browsers of supporting old browsers was a single trivial branch, and maybe fifty bytes in added payload.)
- Writing JavaScript without a build system
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Modern SPAs without bundlers, CDNs, or NodeJS
If we call the shim a framework, would you be ok with it then?
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Import maps 101
If you want import maps to be supported in any browser, there is an ES Module Shims polyfill which is compatible with any browser that has baseline ES Module Support (i.e. Edge 17+, Firefox 60+, Safari 10.1+, and Chrome 61+).
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Everything You Need to Know About JavaScript Import Maps
An example of a polyfill that can be used is the ES Module Shims polyfill that adds support for import maps and other new module features to any browser with baseline support for ES modules (about 94% of browsers). All you need to do is include the es-module-shim script in your HTML file before your import map script:
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How bad is it to not use a bundler?
i often use es-module-shims so i can load npm packages in browsers without a bundler š
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Fresh ā The next-gen web framework
I explored using client-side service workers for build-less deployment workflows a while back, but the blocker was the initial visit when the service worker hasn't been installed yet. Ended up using es-module-shim's fetch hook (https://github.com/guybedford/es-module-shims#fetch-hook) instead, which worked quite well.
I kept the demo repo around here, in case it's helpful to anyone: https://github.com/lewisl9029/buildless-hot-reload-demo.
The repo itself is quite out of date at this point, but my current project, Reflame, is essentially the spiritual successor: https://reflame.app/
Reflame has the same ideals of achieving the developer experience I've always wanted for building client rendered React apps:
- instant production deployments (usually <200ms)
- instant preview environments that match production in pretty much every imaginable way (including the URL), that can also be flipped into development mode for fast-refresh (for the seamless feedback loop we're used to in local dev) and dev-mode dependencies (for better error messaging, etc)
- close-to-instant browser tests (1-3 seconds) that enable image snapshot comparisons that run with maximum parallelism and only rerun when their dependency graphs change
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Do you use Import-Map for your client-side ESM?
The problem of course is that browser-support for Import Maps is sadly lacking (only Chrome/Chromium-based at time of writing). There are tricks/shims to get around this, like ES-Module-Shims. I find these approaches to be a little too intrusive, personally.
Angular
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Angular Signals, Reactive Context, and Dynamic Dependency Tracking
/** * https://github.com/angular/angular/blob/75a186e321cb417685b2f13e9961906fc0aed36c/packages/core/src/render3/reactivity/untracked.ts#L15 * * packages/core/src/render3/reactivity/untracked.ts * **/ export function untracked(nonReactiveReadsFn: () => T): T { const prevConsumer = setActiveConsumer(null); try { return nonReactiveReadsFn(); } finally { setActiveConsumer(prevConsumer); } }
- Episode 24/15: Wiz behind the curtain, Copilot in VSCode
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Always unsubscribe. No exceptions. Debate closed.
source: https://github.com/angular/angular/issues/46542
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Angular Signals: Best Practices
Besides the dangers, mentioned by Angular docs (infinite loops, change detection errors), there is another thing, that might be quite nasty: effects are executed in a reactive context, and any code you call in effect, will be executed in a reactive context. If that code reads some signals, they will be added as dependencies to your effect. Here Alex Rickabaugh explains the details.
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Understanding control flow syntax in Angular 17
In June 2023, the Angular team raised a new RFC to implement control flow syntaxes within Angular. They gave the following rationale for introducing control flow syntax:
- Episode 24/09: Testing without TestBed, SSR & Hydration
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Preparing our Code for Zoneless Angular
For scheduling, I use awesome code I found in the Angular source code.
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ā° Itās time to talk about Import Map, Micro Frontend, and Nx Monorepo
Just to give you more context, I led the migration of several AngularJS applications to the newer Angular Framework. My client finally decided to make that move following the AngularJS deprecation announcement (stay up to date please š)ļø.
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Conventional commit specification
Link ā angular/CONTRIBUTING.md
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Angular Control Flow: the complete guide
Angular v17 was released some months ago with a ton of new features, a brand new logo and the new blog angular.dev.
What are some alternatives?
import-maps - How to control the behavior of JavaScript imports
Next.js - The React Framework
hyperscript - Create HyperText with JavaScript.
qwik - Instant-loading web apps, without effort
Rust Language Server - Repository for the Rust Language Server (aka RLS)
SvelteKit - web development, streamlined
stampino-element
Alpine.js - A rugged, minimal framework for composing JavaScript behavior in your markup.
import-remap - Rewrite ES module import specifiers using an import-map.
solid - A declarative, efficient, and flexible JavaScript library for building user interfaces.
mercury - A truly modular frontend framework
lit - Lit is a simple library for building fast, lightweight web components.