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babel.config.js
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babel.config.js
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'use strict'; // eslint-disable-line strict
// eslint-disable-next-line import/no-commonjs
module.exports = api => {
const isTest = api.cache(() => process.env.NODE_ENV === 'test');
const babelEnv = api.cache(() => process.env.BABEL_ENV);
const isNodeTarget = api.cache(() => process.env.BABEL_TARGET === 'node');
const envTargets = isTest || isNodeTarget ? { node: 'current' } : undefined;
const envOpts = {
loose: true,
modules: babelEnv === 'cjs' || isTest ? 'commonjs' : false,
targets: envTargets,
exclude: [
'transform-typeof-symbol',
'transform-regenerator',
'transform-async-to-generator'
]
};
const presets = [['@babel/preset-env', envOpts], '@babel/preset-typescript'];
const plugins = [
['@babel/plugin-proposal-class-properties', { loose: true }],
!isNodeTarget && [
'@babel/plugin-transform-runtime',
{
regenerator: false,
useESModules: babelEnv === 'es'
}
],
!isNodeTarget && [
'@babel/plugin-transform-regenerator',
{
async: false
}
],
[
'transform-async-to-promises',
{
inlineHelpers: true
}
],
[
'@babel/plugin-proposal-optional-chaining',
{
loose: false
}
],
[
'@babel/plugin-proposal-nullish-coalescing-operator',
{
loose: false
}
],
babelEnv === 'cjs' && 'babel-plugin-add-module-exports'
].filter(Boolean);
return {
presets,
plugins,
ignore: babelEnv === 'cjs' || babelEnv === 'es' ? ['**/__tests__/**'] : []
};
};