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next.js/build/babel/preset.js

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// Resolve styled-jsx plugins
function styledJsxOptions (opts) {
if (!opts) {
return {}
}
if (!Array.isArray(opts.plugins)) {
return opts
}
opts.plugins = opts.plugins.map(plugin => {
if (Array.isArray(plugin)) {
const [name, options] = plugin
return [
require.resolve(name),
options
]
}
return require.resolve(plugin)
})
return opts
}
module.exports = (context, opts = {}) => ({
presets: [
[require('@babel/preset-env'), {
modules: false,
...opts['preset-env']
}],
require('@babel/preset-react')
],
plugins: [
require('babel-plugin-react-require'),
require('./plugins/handle-import'),
require('@babel/plugin-proposal-class-properties'),
require('@babel/plugin-proposal-object-rest-spread'),
[require('@babel/plugin-transform-runtime'), opts['transform-runtime'] || {
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helpers: false,
polyfill: false,
regenerator: true
}],
[require('styled-jsx/babel'), styledJsxOptions(opts['styled-jsx'])],
process.env.NODE_ENV === 'production' && require('babel-plugin-transform-react-remove-prop-types')
].filter(Boolean)
})