element-web/babel.config.js

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module.exports = {
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sourceMaps: true,
presets: [
[
"@babel/preset-env",
{
targets: [
"last 2 Chrome versions",
"last 2 Firefox versions",
"last 2 Safari versions",
"last 2 Edge versions",
],
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},
],
"@babel/preset-typescript",
"@babel/preset-react",
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],
plugins: [
"@babel/plugin-proposal-export-default-from",
"@babel/plugin-proposal-numeric-separator",
"@babel/plugin-proposal-class-properties",
"@babel/plugin-proposal-object-rest-spread",
"@babel/plugin-proposal-optional-chaining",
"@babel/plugin-proposal-nullish-coalescing-operator",
// transform logical assignment (??=, ||=, &&=). preset-env doesn't
// normally bother with these (presumably because all the target
// browsers support it natively), but they make our webpack version (or
// something downstream of babel, at least) fall over.
"@babel/plugin-proposal-logical-assignment-operators",
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"@babel/plugin-syntax-dynamic-import",
"@babel/plugin-transform-runtime",
],
};