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Loosen Babel preset to use browserslist #3770

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merged 6 commits into from
Jan 13, 2018
Merged

Loosen Babel preset to use browserslist #3770

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15b91e2
Provide better defaults
Timer Jan 13, 2018
56c839e
Let babel determine features to compile
Timer Jan 13, 2018
f49973a
meh
Timer Jan 13, 2018
ee2db70
Remove setting of BABEL_ENV
Timer Jan 13, 2018
a0ac137
Revert "Remove setting of BABEL_ENV"
Timer Jan 13, 2018
ce32902
Set browsers to ie9
Timer Jan 13, 2018
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17 changes: 7 additions & 10 deletions packages/babel-preset-react-app/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -46,15 +46,12 @@ module.exports = function(api, opts) {
// Latest stable ECMAScript features
require('@babel/preset-env').default,
{
targets: {
// React parses on ie 9, so we should too
ie: 9,
},
// We currently minify with uglify
// Remove after https://github.com/mishoo/UglifyJS2/issues/448
forceAllTransforms: true,
// Disable polyfill transforms
useBuiltIns: false,
// `entry` transforms `@babel/polyfill` into individual requires for
// the targeted browsers. This is safer than `usage` which performs
// static code analysis to determine what's required.
// This is probably a fine default to help trim down bundles when
// end-users inevitably import '@babel/polyfill'.
useBuiltIns: 'entry',
// Do not transform modules to CJS
modules: false,
},
Expand Down Expand Up @@ -104,7 +101,7 @@ module.exports = function(api, opts) {
!isEnvTest && [
require('@babel/plugin-transform-regenerator').default,
{
// Async functions are converted to generators by babel-preset-env
// Async functions are converted to generators by @babel/preset-env
async: false,
},
],
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12 changes: 6 additions & 6 deletions packages/react-scripts/scripts/init.js
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Expand Up @@ -43,12 +43,12 @@ module.exports = function(
eject: 'react-scripts eject',
};

appPackage.browserslist = [
'>1%',
'last 4 versions',
'Firefox ESR',
'not ie < 9',
];
appPackage.browserslist = {
development: ['chrome', 'firefox', 'edge'].map(
browser => `last 2 ${browser} versions`
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Why this change? Does this correspond to any specific list we use elsewhere?

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Never mind, I got it.
Wish there was a shorter way to write this.
Maybe something like >5% is equivalent?

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I couldn't find a magic percent -- and I didn't want to discriminate browsers.

),
production: ['>1%', 'last 4 versions', 'Firefox ESR', 'not ie < 11'],
};

fs.writeFileSync(
path.join(appPath, 'package.json'),
Expand Down
4 changes: 4 additions & 0 deletions tasks/e2e-kitchensink.sh
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Expand Up @@ -22,6 +22,7 @@ original_yarn_registry_url=`yarn config get registry`

function cleanup {
echo 'Cleaning up.'
unset BROWSERSLIST
ps -ef | grep 'react-scripts' | grep -v grep | awk '{print $2}' | xargs kill -9
cd "$root_path"
# TODO: fix "Device or resource busy" and remove ``|| $CI`
Expand Down Expand Up @@ -114,6 +115,9 @@ yarn add test-integrity@^2.0.1
# Enter the app directory
cd "$temp_app_path/test-kitchensink"

# In kitchensink, we want to test all transforms
export BROWSERSLIST='ie 9'

# Link to test module
npm link "$temp_module_path/node_modules/test-integrity"

Expand Down