From 585dd97c38c34c3d8cdda7d47635606cdbe443fa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Robin=20M=C3=A9tral?= <robin@metral.ch>
Date: Wed, 4 Mar 2020 21:32:02 +0100
Subject: [PATCH] fix: avoid array.prototype.flat (#15)

Update tsconfig to reflect that we are using ES2018 (Node 10). Array.prototype.flat is only available in Node 11. Instead of using a polyfill, we will use concat to flatten the array of object arrays
---
 src/gatsby-node.ts | 7 +++++--
 tsconfig.json      | 2 +-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/gatsby-node.ts b/src/gatsby-node.ts
index 53ab6a6b..7e00000d 100644
--- a/src/gatsby-node.ts
+++ b/src/gatsby-node.ts
@@ -50,13 +50,16 @@ export async function sourceNodes(
   };
 
   try {
-    const objects = await Promise.all(
+    let objects: Array<any> = await Promise.all(
       buckets.map(bucket => listObjects(bucket))
     );
+    // flatten objects
+    // flat() is not supported in node 10
+    objects = [].concat(...objects);
 
     // create file nodes
     // todo touch nodes if they exist already
-    objects?.flat().forEach(async object => {
+    objects?.forEach(async object => {
       const { Key, Bucket } = object;
       const { region } = awsConfig;
 
diff --git a/tsconfig.json b/tsconfig.json
index 6befb10d..3778b818 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "lib": ["ESNext"],
+    "lib": ["ES2018"],
     "module": "CommonJS",
     // support node 10 and newer
     "target": "ES2018",