From 96d05829002ef065b8fc84fe70de062cff0e95b3 Mon Sep 17 00:00:00 2001
From: Casper Beyer <caspervonb@pm.me>
Date: Tue, 29 Jun 2021 09:39:19 +0800
Subject: fix(cli): pretty print coverage files (#11157)

---
 cli/tools/coverage.rs | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'cli/tools/coverage.rs')

diff --git a/cli/tools/coverage.rs b/cli/tools/coverage.rs
index 9a64cd5f3..c7d7a2cb7 100644
--- a/cli/tools/coverage.rs
+++ b/cli/tools/coverage.rs
@@ -20,6 +20,9 @@ use serde::Deserialize;
 use serde::Serialize;
 use sourcemap::SourceMap;
 use std::fs;
+use std::fs::File;
+use std::io::BufWriter;
+use std::io::Write;
 use std::path::PathBuf;
 use swc_common::Span;
 use uuid::Uuid;
@@ -61,8 +64,12 @@ impl CoverageCollector {
     let script_coverages = take_coverage_result.result;
     for script_coverage in script_coverages {
       let filename = format!("{}.json", Uuid::new_v4());
-      let json = serde_json::to_string(&script_coverage)?;
-      fs::write(self.dir.join(filename), &json)?;
+      let filepath = self.dir.join(filename);
+
+      let mut out = BufWriter::new(File::create(filepath)?);
+      serde_json::to_writer_pretty(&mut out, &script_coverage)?;
+      out.write_all(b"\n")?;
+      out.flush()?;
     }
 
     self.session.post_message("Profiler.disable", None).await?;
-- 
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