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fix(plugin-legacy): turn off babel loose mode #3406

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merged 2 commits into from
May 17, 2021
Merged

fix(plugin-legacy): turn off babel loose mode #3406

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732120a
fix: turn off babel loose mode
nihalgonsalves May 13, 2021
bd10d60
test: add set down-transpile test
nihalgonsalves May 13, 2021
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5 changes: 5 additions & 0 deletions packages/playground/legacy/__tests__/legacy.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,3 +7,8 @@ test('should work', async () => {
test('import.meta.env.LEGACY', async () => {
expect(await page.textContent('#env')).toMatch(isBuild ? 'true' : 'false')
})

// https://github.com/vitejs/vite/issues/3400
test('transpiles down iterators correctly', async () => {
expect(await page.textContent('#iterators')).toMatch('hello')
})
1 change: 1 addition & 0 deletions packages/playground/legacy/index.html
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
<h1 id="app"></h1>
<div id="env"></div>
<div id="iterators"></div>
<script type="module" src="./main.js"></script>
6 changes: 6 additions & 0 deletions packages/playground/legacy/main.js
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Expand Up @@ -15,3 +15,9 @@ if (import.meta.env.LEGACY) {
}

document.getElementById('env').textContent = `is legacy: ${isLegacy}`

// Iterators

document.getElementById('iterators').textContent = [...new Set(['hello'])].join(
''
)
2 changes: 1 addition & 1 deletion packages/plugin-legacy/index.js
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Expand Up @@ -248,7 +248,7 @@ function viteLegacyPlugin(options = {}) {
targets,
modules: false,
bugfixes: true,
loose: true,
loose: false,
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suggestion (idea): Don't know if it's useful in anycase or why we need to set loose mode to false here, but on some places we already often have the possibility to let users decide to override such options 🤔
So we may do something like loose: options.babelTransformOptions?.loose ?? false here, could we?
Maybe there is also a better name than babelTransformOptions

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