Upgrade to Babel 7 (#6942)

Babel 7 moved to a new configuration format, and they've scoped all of
their packages under `@babel/`. This brings MetaMask in-line with
dependencies we use that _already_ use Babel 7, and it eliminates a
few unfortunate edge cases that can prevent dependencies from being
correctly transpiled.

1 files changed, 24 insertions, 0 deletions

diff --git a/babel.config.js b/babel.config.js
new file mode 100644
index 000000000..173ebc41a
--- /dev/null
+++ b/babel.config.js
@@ -0,0 +1,24 @@
+module.exports = function (api) {
+  api.cache(false)
+  return {
+    presets: [
+      [
+        '@babel/preset-env',
+        {
+          targets: {
+            browsers: [
+              'chrome >= 58',
+              'firefox >= 60',
+            ],
+          },
+        },
+      ],
+      '@babel/preset-react',
+    ],
+    plugins: [
+      '@babel/plugin-transform-runtime',
+      '@babel/plugin-proposal-class-properties',
+      '@babel/plugin-proposal-object-rest-spread',
+    ],
+  }
+}