Transpile @gitlab/ui for Jest

1 files changed, 47 insertions, 0 deletions

diff --git a/babel.config.js b/babel.config.js
new file mode 100644
index 00000000000..e3de8ef2d83
--- /dev/null
+++ b/babel.config.js
@@ -0,0 +1,47 @@
+/* eslint-disable import/no-commonjs, filenames/match-regex */
+
+const BABEL_ENV = process.env.BABEL_ENV || process.env.NODE_ENV || null;
+
+const presets = [
+  [
+    '@babel/preset-env',
+    {
+      modules: false,
+      targets: {
+        ie: '11',
+      },
+    },
+  ],
+];
+
+// include stage 3 proposals
+const plugins = [
+  '@babel/plugin-syntax-dynamic-import',
+  '@babel/plugin-syntax-import-meta',
+  '@babel/plugin-proposal-class-properties',
+  '@babel/plugin-proposal-json-strings',
+  '@babel/plugin-proposal-private-methods',
+];
+
+// add code coverage tooling if necessary
+if (BABEL_ENV === 'coverage') {
+  plugins.push([
+    'babel-plugin-istanbul',
+    {
+      exclude: ['spec/javascripts/**/*', 'app/assets/javascripts/locale/**/app.js'],
+    },
+  ]);
+}
+
+// add rewire support when running tests
+if (BABEL_ENV === 'karma' || BABEL_ENV === 'coverage') {
+  plugins.push('babel-plugin-rewire');
+}
+
+// Jest is running in node environment
+if (BABEL_ENV === 'jest') {
+  plugins.push('transform-es2015-modules-commonjs');
+  plugins.push('dynamic-import-node');
+}
+
+module.exports = { presets, plugins };