accounts-frontend/babel.config.js

/* eslint-env node */
// @ts-nocheck
module.exports = function (api) {
    const env = api.env();
    const isProduction = api.env((envName) => envName.includes('production'));

    api.cache.using(() => env);

    const browserEnv = {
        plugins: ['react-hot-loader/babel'],
        presets: [
            [
                '@babel/preset-env',
                {
                    shippedProposals: true,
                    ignoreBrowserslistConfig: false,
                    modules: false,
                    useBuiltIns: 'usage', // or "entry"
                    corejs: 3,
                    include: ['proposal-class-properties'],
                },
            ],
        ],
    };

    return {
        presets: [
            '@babel/preset-react',
            [
                '@babel/preset-env',
                {
                    ignoreBrowserslistConfig: true,
                    targets: {
                        node: true,
                    },
                    modules: 'commonjs',
                },
            ],
            [
                // NOTE: preset-typescript must go before proposal-class-properties
                // in order to use allowDeclareFields option
                // proposal-class-properties is enabled by preset-env for browser env
                // preset-env for nodejs does not need it, because recent node versions support class fields
                //
                // but, due to some bugs (?), we must place preset-typescript here so that it loads as
                // last default preset, before loading browser presets.
                // Only this combination is working without errors
                '@babel/preset-typescript',
                {
                    allowDeclareFields: true,
                },
            ],
        ],
        plugins: [
            '@babel/plugin-syntax-dynamic-import',
            '@babel/plugin-proposal-function-bind',
            '@babel/plugin-proposal-optional-chaining',
            '@babel/plugin-transform-runtime',
            [
                'react-intl-auto',
                {
                    removePrefix: 'packages.app',
                    messagesDir: './build/messages/',
                    useKey: true,
                    removeDefaultMessage: isProduction,
                },
            ],
        ],
        env: {
            browser: browserEnv,
            'browser-development': browserEnv,
            'browser-production': browserEnv,
        },
    };
};