index.js

module.exports = (api, options) => {
		const {
				debug = false,
				modules = 'auto',
				shippedProposals = true,
				spec = true,
				useBuiltIns = 'usage',
				targets
		} = options;

		return {
				presets: [
						[
								require('@babel/preset-env'),
								{
										debug,
										modules,
										shippedProposals,
										spec,
										useBuiltIns,
										targets,
										corejs: {
												version: 3,
												proposals: true
										}
								}
						],
						require('@babel/preset-react'),
						require('@babel/preset-typescript')
				].filter(Boolean),
				plugins: [
						require('@babel/plugin-proposal-optional-chaining'),
						require('babel-plugin-styled-components'),
						require('@babel/plugin-transform-react-constant-elements'),
						require('@babel/plugin-proposal-class-properties'),
						require('@babel/plugin-proposal-json-strings'),
						require('@babel/plugin-syntax-dynamic-import'),
						require('@babel/plugin-syntax-import-meta'),
						api.env('test') && require('babel-plugin-dynamic-import-node')
				].filter(Boolean)
		};
};