refactor(compiler-sfc): destructure built-in properties ($emit,$attrs,$slots) in inline mode

[LittleSound]

In compiler inline mode, template globals that are implicitly declared will be obtained directly from the setup function parameters, but only when they are actually used in the template.

This applies to vDOM, Vapor, and SSR production builds. through this refactor, we've provided a unified way to cover multiple scenarios.

Minimal Reproduction in Playground

Example

Input:

<script setup>/* ... */</script>
<template>
  <div>
    <p>$props {{ $props }}</p>
    <p>$emit {{ $emit }}</p>
    <p>$attrs {{ $attrs }}</p>
    <p>$slots {{ Object.keys($slots) }}</p>
  </div>
</template>

Generated code:

export default {
  setup(__props, { emit: $emit, attrs: $attrs, slots: $slots }) {
    const $props = __props
    // ... rest of setup code
    return (_ctx, _cache) => {
      // template render function using $props, $emit, $attrs, $slots directly
    }
  }
}

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[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	84.1 kB	29.8 kB	26.3 kB
runtime-dom.global.prod.js	104 kB	39.1 kB	35.2 kB
vue.global.prod.js	162 kB	59.3 kB	52.8 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	47.1 kB	18.4 kB	16.9 kB
createApp	56 kB	21.6 kB	19.7 kB
createApp + vaporInteropPlugin	68.5 kB	25.8 kB	23.6 kB
createVaporApp	20.9 kB	8.26 kB	7.56 kB
createSSRApp	60.3 kB	23.3 kB	21.3 kB
defineCustomElement	61 kB	23.1 kB	21.1 kB
overall	70.5 kB	26.8 kB	24.4 kB

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commit: 904020a