babel.config.js

/** @type {import('@babel/core/src/config/files').ConfigFile} */
module.exports = {
    presets: [
        [
            '@babel/preset-env',
            {
                useBuiltIns: 'usage',
                corejs: {
                    version: '3.21',
                    proposals: true,
                },
                shippedProposals: true,
                targets: {
                    node: 'current',
                    browsers: '> 0.25%, not dead',
                },
                bugfixes: true,
            },
        ],
        [
            '@babel/preset-typescript',
            {
                allowDeclareFields: true, // sets class fields with only types to `undefined`, e.g. `class X { val: string; }; {...new X()} => { val: undefined }`
                // onlyRemoveTypeImports: true, // removes all `import/export type {...}` lines. This is done by default in tsconfig, but if issues exist in Babel, uncomment this
            },
        ],
    ],
    plugins: [
        '@babel/plugin-transform-runtime',
    ],
};