From a17b6ca48053f2b5ff7659f1d5794317187b51d9 Mon Sep 17 00:00:00 2001
From: Matt Lewis <matthew.lewis@socialsignin.co.uk>
Date: Wed, 23 May 2018 10:10:34 +0100
Subject: [PATCH] fix: don't log errors twice when using multiple reporters

Fixes #44
---
 src/reporter.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/reporter.js b/src/reporter.js
index bd825c9..b9c7f7e 100644
--- a/src/reporter.js
+++ b/src/reporter.js
@@ -19,6 +19,15 @@ function checkThresholds(thresholds, summary) {
 function CoverageIstanbulReporter(baseReporterDecorator, logger, config) {
   baseReporterDecorator(this);
 
+  // Copied from https://github.com/angular/angular-cli/pull/9529/files
+  // Fixes https://github.com/mattlewis92/karma-coverage-istanbul-reporter/issues/44
+  const reporterName = 'coverage-istanbul';
+  const hasTrailingReporters =
+    config.reporters.slice(-1).pop() !== reporterName;
+  if (hasTrailingReporters) {
+    this.writeCommonMsg = () => {};
+  }
+
   const log = logger.create('reporter.coverage-istanbul');
   const browserCoverage = new WeakMap();
   const coverageConfig = Object.assign({}, config.coverageIstanbulReporter);