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/* eslint-disable import/no-commonjs, filenames/match-regex */
const BABEL_ENV = process.env.BABEL_ENV || process.env.NODE_ENV || null;
let presets = [
[
'@babel/preset-env',
{
useBuiltIns: 'usage',
corejs: { version: 3, proposals: true },
modules: false,
/**
* This list of browsers is a conservative first definition, based on
* https://docs.gitlab.com/ee/install/requirements.html#supported-web-browsers
* with the following reasoning:
*
* - Edge: Pick the last two major version before the Chrome switch
* - Rest: We should support the latest ESR of Firefox: 68, because it used quite a lot.
* For the rest, pick browser versions that have a similar age to Firefox 68.
*
* See also this follow-up epic:
* https://gitlab.com/groups/gitlab-org/-/epics/3957
*/
targets: {
chrome: '73',
edge: '17',
firefox: '68',
safari: '12',
},
},
],
];
// include stage 3 proposals
const plugins = [
'@babel/plugin-syntax-import-meta',
'@babel/plugin-proposal-class-properties',
'@babel/plugin-proposal-json-strings',
'@babel/plugin-proposal-private-methods',
// See: https://gitlab.com/gitlab-org/gitlab/-/issues/229146
'@babel/plugin-transform-arrow-functions',
'lodash',
];
// add code coverage tooling if necessary
if (BABEL_ENV === 'coverage') {
plugins.push([
'babel-plugin-istanbul',
{
exclude: ['spec/javascripts/**/*', 'app/assets/javascripts/locale/**/app.js'],
},
]);
}
// Jest is running in node environment, so we need additional plugins
const isJest = Boolean(process.env.JEST_WORKER_ID);
if (isJest) {
plugins.push('@babel/plugin-transform-modules-commonjs');
/*
without the following, babel-plugin-istanbul throws an error:
https://gitlab.com/gitlab-org/gitlab-foss/issues/58390
*/
plugins.push('babel-plugin-dynamic-import-node');
presets = [
[
'@babel/preset-env',
{
targets: {
node: 'current',
},
},
],
];
}
module.exports = { presets, plugins, sourceType: 'unambiguous' };
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