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Pan 2019-04-16 10:16:54 +08:00
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@ -14,11 +14,11 @@ const content = `<p>Last week at<a href="https://vuejs.london/summary" rel="nofo
<blockquote>TL;DR: better decoupled internal modules, TypeScript, and a codebase that is easier to contribute to.</blockquote>
<p>We are re-writing 3.0 from the ground up for a cleaner and more maintainable architecture, in particular trying to make it easier to contribute to. We are breaking some internal functionalities into individual packages in order to isolate the scope of complexity. For example, the observer module will become its own package, with its own public API and tests. Note this does not affect framework-level API— you will not have to manually import individual bits from multiple packages in order to use Vue. Instead, the final Vue package is assembled using these internal packages.</p>
<p>The codebase is also now written in TypeScript. Although this will make proficiency in TypeScript a pre-requisite for contributing to the new codebase, we believe the type information and IDE support will actually make it easier for a new contributor to make meaningful contributions.</p>
<p>Decoupling the observer and scheduler into separate packages also allows us to easily experiment with alternative implementations of these parts. For example, we can implement an IE11 compatible observer implementation with the same API, or an alternative scheduler that leverages<aside>requestIdleCallback</aside>to yield to the browser during long updates.*</p>
<p>Decoupling the observer and scheduler into separate packages also allows us to easily experiment with alternative implementations of these parts. For example, we can implement an IE11 compatible observer implementation with the same API, or an alternative scheduler that leverages<code>requestIdleCallback</code>to yield to the browser during long updates.*</p>
<p><img class=" wscnph" src="https://wpimg.wallstcn.com/4d0b5fb2-d7f9-48fd-8f1b-03362b534dd9.png" data-wscntype="image" data-wscnh="716" data-wscnw="460" /></p>
<h4>Observation Mechanism</h4>
<blockquote>TL;DR: more complete, precise, efficient and debuggable reactivity tracking &amp; API for creating observables.</blockquote>
<p>3.0 will ship with a Proxy-based observer implementation that provides reactivity tracking with full language coverage. This eliminates a number of limitations of Vue 2’s current implementation based on<aside>Object.defineProperty</aside>:</p>
<p>3.0 will ship with a Proxy-based observer implementation that provides reactivity tracking with full language coverage. This eliminates a number of limitations of Vue 2’s current implementation based on<code>Object.defineProperty</code>:</p>
<p>The new observer also features the following:</p>
<p>Easily understand why a component is re-rendering</p>
<p><img class=" wscnph" src="https://wpimg.wallstcn.com/a0c9d811-1ef9-4628-8976-f7c1aaa66da0.png" data-wscntype="image" data-wscnh="540" data-wscnw="789" /></p>
@ -28,7 +28,7 @@ const content = `<p>Last week at<a href="https://vuejs.london/summary" rel="nofo
<blockquote>TL;DR: tree-shaking friendly output, more AOT optimizations, parser with better error info and source map support.</blockquote>
<h4>IE11 Support*</h4>
<blockquote>TL;DR: it will be supported, but in a separate build with the same reactivity limitations of Vue 2.x.</blockquote>
<p>The new codebase currently targets evergreen browsers only and assumes baseline native ES2015 support. But alas, we know a lot of our users still need to support IE11 for the foreseeable future. Most of the ES2015 features used can be transpiled / polyfilled for IE11, with the exception for Proxies. Our plan is to implement an alternative observer with the same API, but using the good old ES5<aside>Object.defineProperty</aside>API. A separate build of Vue 3.x will be distributed using this observer implementation. However, this build will be subject to the same change detection caveats of Vue 2.x and thus not fully compatible with the “modern” build of 3.x. We are aware that this imposes some inconvenience for library authors as they will need to be aware of compatibility for two different builds, but we will make sure to provide clear guidelines on this when we reach that stage.</p>
<p>The new codebase currently targets evergreen browsers only and assumes baseline native ES2015 support. But alas, we know a lot of our users still need to support IE11 for the foreseeable future. Most of the ES2015 features used can be transpiled / polyfilled for IE11, with the exception for Proxies. Our plan is to implement an alternative observer with the same API, but using the good old ES5<code>Object.defineProperty</code>API. A separate build of Vue 3.x will be distributed using this observer implementation. However, this build will be subject to the same change detection caveats of Vue 2.x and thus not fully compatible with the “modern” build of 3.x. We are aware that this imposes some inconvenience for library authors as they will need to be aware of compatibility for two different builds, but we will make sure to provide clear guidelines on this when we reach that stage.</p>
<h3>How Do We GetThere</h3>
<p>First of all, although we are announcing it today, we do not have a definitive timeline yet. What we do know at the moment is the steps we will be taking to get there:</p>
<h4>1. Internal Feedback for the Runtime Prototype</h4>