From a31d142253c9c2100bf3d9ad2139098d8e877500 Mon Sep 17 00:00:00 2001
From: Brendan Dahl <brendan.dahl@gmail.com>
Date: Fri, 9 Apr 2021 10:34:15 -0700
Subject: [PATCH] Cache babel source map.

When source is already cached and you reload,
the source map is lost which makes debugging
async functions difficult.
---
 external/systemjs/plugin-babel-cached.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/external/systemjs/plugin-babel-cached.js b/external/systemjs/plugin-babel-cached.js
index 518dfa4ce..f39b718e0 100644
--- a/external/systemjs/plugin-babel-cached.js
+++ b/external/systemjs/plugin-babel-cached.js
@@ -43,7 +43,7 @@ function getDb() {
   return dbPromise;
 }
 
-function storeCache(address, hashCode, translated, format) {
+function storeCache(address, hashCode, translated, format, sourceMap) {
   return getDb().then(function (db) {
     var tx = db.transaction(dbCacheTable, "readwrite");
     var store = tx.objectStore(dbCacheTable);
@@ -53,6 +53,7 @@ function storeCache(address, hashCode, translated, format) {
       translated,
       expires: Date.now() + cacheExpiration,
       format,
+      sourceMap,
     });
     return new Promise(function (resolve, reject) {
       tx.oncomplete = function () {
@@ -80,6 +81,7 @@ function loadCache(address, hashCode) {
             ? {
                 translated: found.translated,
                 format: found.format,
+                sourceMap: found.sourceMap,
               }
             : null
         );
@@ -127,7 +129,8 @@ exports.translate = function (load, opt) {
               load.address,
               savedHashCode,
               translated,
-              load.metadata.format
+              load.metadata.format,
+              load.metadata.sourceMap
             ).then(function () {
               return translated;
             });