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index.js
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index.js
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const r = require(`./resolver`)
function preset(context, options = {}) {
const { browser = false, debug = false, nodeVersion = `12.13.0`, esm = false } = options
const { NODE_ENV, BABEL_ENV } = process.env
const IS_TEST = (BABEL_ENV || NODE_ENV) === `test`
const browserConfig = {
useBuiltIns: false,
}
if (browser) {
if (esm) {
browserConfig.targets = {
esmodules: true
}
} else {
browserConfig.targets = {
browsers: [`last 2 versions`, `not ie <= 11`, `not android 4.4.3`]
}
}
}
const nodeConfig = {
corejs: 3,
useBuiltIns: `entry`,
targets: {
node: nodeVersion,
},
}
return {
presets: [
[
r(`@babel/preset-env`),
Object.assign(
{
loose: true,
debug: !!debug,
shippedProposals: true,
modules: esm ? false : `commonjs`,
bugfixes: esm,
},
browser ? browserConfig : nodeConfig
),
],
[r(`@babel/preset-react`)],
r(`@babel/preset-flow`),
],
plugins: [
r(`@babel/plugin-proposal-nullish-coalescing-operator`),
r(`@babel/plugin-proposal-optional-chaining`),
r(`@babel/plugin-transform-runtime`),
r(`@babel/plugin-syntax-dynamic-import`),
IS_TEST && r(`babel-plugin-dynamic-import-node`),
].filter(Boolean),
overrides: [
{
test: [`**/*.ts`, `**/*.tsx`],
plugins: [[`@babel/plugin-transform-typescript`, { isTSX: true }]],
},
],
}
}
module.exports = preset