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babel.config.js
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module.exports = function (api) {
var validEnv = ["development", "test", "production"];
var currentEnv = api.env();
var isProductionEnv = api.env("production");
var isTestEnv = api.env("test");
if (!validEnv.includes(currentEnv)) {
throw new Error(
"Please specify a valid `NODE_ENV` or " +
'`BABEL_ENV` environment variables. Valid values are "development", ' +
'"test", and "production". Instead, received: ' +
JSON.stringify(currentEnv) +
"."
);
}
return {
// Correctly import CommonJS modules
sourceType: "unambiguous",
presets: [
[
"@babel/preset-env",
{
useBuiltIns: "usage",
corejs: 3,
// See https://browsersl.ist/?q=defaults for a full list of browsers
// included as defaults.
targets: "defaults",
exclude: ["transform-typeof-symbol"],
forceAllTransforms: true,
modules: false,
loose: true,
},
],
"@babel/preset-react",
"@babel/preset-typescript",
],
plugins: [
"babel-plugin-macros",
"@babel/plugin-syntax-dynamic-import",
"@babel/plugin-transform-destructuring",
["@babel/plugin-proposal-class-properties", { loose: true }],
["@babel/plugin-proposal-object-rest-spread", { useBuiltIns: true }],
[
"@babel/plugin-transform-runtime",
{
// NOTE: Unable to specify this since react-google-maps
// depends on the old @babel/runtime
// corejs: 3,
helpers: false,
regenerator: true,
},
],
["@babel/plugin-transform-regenerator", { async: false }],
isProductionEnv && [
"babel-plugin-transform-react-remove-prop-types",
{ removeImport: true },
],
["@babel/plugin-proposal-private-methods", { loose: true }],
["@babel/plugin-proposal-private-property-in-object", { loose: true }],
isTestEnv && "babel-plugin-dynamic-import-node",
isTestEnv && "@babel/plugin-transform-modules-commonjs",
"@babel/plugin-proposal-nullish-coalescing-operator",
"react-hot-loader/babel",
].filter(Boolean),
};
};