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babel.config.js
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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 isDevelopmentEnv = api.env("development");
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 {
presets: [
isTestEnv && [
"@babel/preset-env",
{
targets: {
node: "current",
},
},
],
(isProductionEnv || isDevelopmentEnv) && [
"@babel/preset-env",
{
forceAllTransforms: true,
useBuiltIns: "entry",
corejs: 3,
modules: false,
exclude: ["transform-typeof-symbol"],
},
],
].filter(Boolean),
plugins: [
"babel-plugin-macros",
"@babel/plugin-syntax-dynamic-import",
isTestEnv && "babel-plugin-dynamic-import-node",
"@babel/plugin-transform-destructuring",
[
"@babel/plugin-proposal-class-properties",
{
loose: true,
},
],
[
"@babel/plugin-proposal-object-rest-spread",
{
useBuiltIns: true,
},
],
[
"@babel/plugin-transform-runtime",
{
helpers: false,
},
],
[
"@babel/plugin-transform-regenerator",
{
async: false,
},
],
["@babel/plugin-proposal-private-methods", { loose: true }],
].filter(Boolean),
};
};