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fix(babel): set useBuiltins to false during MODERN_BUILD #1758

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merged 3 commits into from Jul 8, 2018
Merged

fix(babel): set useBuiltins to false during MODERN_BUILD #1758

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09eb248
fix(babel): set useBuiltins to false dring MODERN_BUILD
LinusBorg Jul 4, 2018
8756cf0
refactor(babel): use `ignoreBrowserslistConfig`
LinusBorg Jul 4, 2018
ebf5ad2
fix: don't override user options
Jul 8, 2018
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32 changes: 32 additions & 0 deletions packages/@vue/babel-preset-app/__tests__/babel-preset.spec.js
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Expand Up @@ -35,6 +35,38 @@ test('polyfill detection', () => {
expect(code).toMatch(`import "core-js/modules/es6.map"`)
})

test('modern mode always skips polyfills', () => {
process.env.VUE_CLI_MODERN_BUILD = true
let { code } = babel.transformSync(`
const a = new Map()
`.trim(), {
babelrc: false,
presets: [[preset, {
targets: { ie: 9 },
useBuiltIns: 'usage'
}]]
})
// default includes
expect(code).not.toMatch(`import "core-js/modules/es6.promise"`)
// usage-based detection
expect(code).not.toMatch(`import "core-js/modules/es6.map"`)

;({ code } = babel.transformSync(`
const a = new Map()
`.trim(), {
babelrc: false,
presets: [[preset, {
targets: { ie: 9 },
useBuiltIns: 'entry'
}]]
}))
// default includes
expect(code).not.toMatch(`import "core-js/modules/es6.promise"`)
// usage-based detection
expect(code).not.toMatch(`import "core-js/modules/es6.map"`)
delete process.env.VUE_CLI_MODERN_BUILD
})

test('object spread', () => {
const { code } = babel.transformSync(`
const a = { ...b }
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2 changes: 1 addition & 1 deletion packages/@vue/babel-preset-app/index.js
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Expand Up @@ -42,7 +42,7 @@ module.exports = (context, options = {}) => {
modules = false,
targets: rawTargets,
spec,
ignoreBrowserslistConfig,
ignoreBrowserslistConfig = !!process.env.VUE_CLI_MODERN_BUILD,
configPath,
include,
exclude,
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