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feat(plugin-legacy): make terser optional if renderLegacyChunk false #9453

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feat(plugin-legacy): make terser optional if renderLegacyChunk false #9453

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5f50693
feat(plugin-legacy): make terser optional if renderLegacyChunk false
bluwy Jul 30, 2022
22f5658
docs: update text
bluwy Aug 2, 2022
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2 changes: 1 addition & 1 deletion packages/plugin-legacy/README.md
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Expand Up @@ -27,7 +27,7 @@ export default {
}
```

Terser must be installed because plugin-legacy uses Terser for minification.
If [renderLegacyChunks](#renderlegacychunks) is `true` (default), Terser must be installed because plugin-legacy uses Terser to minify legacy chunks.

```sh
npm add -D terser
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5 changes: 5 additions & 0 deletions packages/plugin-legacy/package.json
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Expand Up @@ -45,6 +45,11 @@
"terser": "^5.4.0",
"vite": "^3.0.0"
},
"peerDependenciesMeta": {
"terser": {
"optional": true
}
},
"devDependencies": {
"@babel/core": "^7.18.9",
"vite": "workspace:*"
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4 changes: 3 additions & 1 deletion packages/plugin-legacy/src/index.ts
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Expand Up @@ -648,7 +648,9 @@ async function buildPolyfillChunk(
excludeSystemJS?: boolean
) {
let { minify, assetsDir } = buildOptions
minify = minify ? 'terser' : false
if (format === 'iife') {
minify = minify ? 'terser' : false
}
Comment on lines +651 to +653
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Note: This function is only called in two places. One for building the modern polyfilll chunk, two for legacy polyfill chunk. They pass es and iife respectively. So this changes that modern polyfills uses esbuild instead, which should be fine.

const res = await build({
// so that everything is resolved from here
root: path.dirname(fileURLToPath(import.meta.url)),
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