From 9c95e2d21d444ce1d9494584d2ffd6a7fc91d5ac Mon Sep 17 00:00:00 2001
From: nickolay <nickolay8@gmail.com>
Date: Mon, 23 Mar 2020 13:31:03 +0300
Subject: [PATCH] fix: Merge reports with concurrency limit instead of fetching
 everything in memory (#1263)

---
 index.js | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/index.js b/index.js
index 6d74d0831..8bb560c9d 100755
--- a/index.js
+++ b/index.js
@@ -408,11 +408,16 @@ class NYC {
 
   async getCoverageMapFromAllCoverageFiles (baseDirectory) {
     const map = libCoverage.createCoverageMap({})
+    const files = await this.coverageFiles(baseDirectory)
 
-    const data = await this.coverageData(baseDirectory)
-    data.forEach(report => {
-      map.merge(report)
-    })
+    await pMap(
+      files,
+      async f => {
+        const report = await this.coverageFileLoad(f, baseDirectory)
+        map.merge(report)
+      },
+      { concurrency: os.cpus().length }
+    )
 
     map.data = await this.sourceMaps.remapCoverage(map.data)