From 050737bb0e425eb5444c0f17281e5bdb79319430 Mon Sep 17 00:00:00 2001
From: Matt Broadstone <mbroadst@mongodb.com>
Date: Fri, 27 Mar 2020 19:17:05 -0400
Subject: [PATCH] feat: introduce rollup-plugin-babel to maintain legacy node
 support

This patch pipes the build process through babel, ensuring the
resulting output can still be used in all of the environments
supported by v1.x of esquery.
---
 .babelrc         | 5 +++++
 package.json     | 6 +++---
 rollup.config.js | 4 +++-
 3 files changed, 11 insertions(+), 4 deletions(-)
 create mode 100644 .babelrc

diff --git a/.babelrc b/.babelrc
new file mode 100644
index 0000000..95f66ec
--- /dev/null
+++ b/.babelrc
@@ -0,0 +1,5 @@
+{
+  "presets": [
+      "@babel/env"
+  ]
+}
\ No newline at end of file
diff --git a/package.json b/package.json
index 12f62b3..5f65304 100644
--- a/package.json
+++ b/package.json
@@ -51,6 +51,9 @@
     "query"
   ],
   "devDependencies": {
+    "@babel/core": "^7.9.0",
+    "@babel/preset-env": "7.8.7",
+    "rollup-plugin-babel": "^4.4.0",
     "@rollup/plugin-commonjs": "^11.0.2",
     "@rollup/plugin-json": "^4.0.2",
     "@rollup/plugin-node-resolve": "^7.1.1",
@@ -65,9 +68,6 @@
     "rollup-plugin-terser": "^5.2.0"
   },
   "license": "BSD-3-Clause",
-  "engines": {
-    "node": ">=8.0"
-  },
   "dependencies": {
     "estraverse": "^5.0.0"
   }
diff --git a/rollup.config.js b/rollup.config.js
index dedfb2d..44fdc25 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -3,6 +3,7 @@ import { terser } from 'rollup-plugin-terser';
 import nodeResolve from '@rollup/plugin-node-resolve';
 import commonjs from '@rollup/plugin-commonjs';
 import json from '@rollup/plugin-json';
+import babel from 'rollup-plugin-babel';
 
 /**
  * @external RollupConfig
@@ -30,7 +31,8 @@ function getRollupObject ({ minifying, format = 'umd' } = {}) {
         plugins: [
             json(),
             nodeResolve(),
-            commonjs()
+            commonjs(),
+            babel({ exclude: 'node_modules/**' })
         ]
     };
     if (minifying) {