module.exports = { presets: [ [ "@babel/preset-env", { corejs: 3, loose: true, // Loose mode for…of loops are 5× faster in Firefox useBuiltIns: "usage", }, ], "@babel/typescript", ], plugins: [ "@babel/proposal-class-properties", ["@babel/plugin-proposal-unicode-property-regex", {useUnicodeFlag: false}], ], sourceType: "unambiguous", };