From 3c459de1b0f3a2074feaa5cb889d8c989a644172 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ma=C3=ABl=20Nison?= <nison.mael@gmail.com>
Date: Tue, 21 Feb 2017 18:19:33 +0000
Subject: [PATCH] Unescapes ESC character, fixing #2439 (#2745)

---
 __tests__/reporters/base-reporter.js | 6 ++++++
 src/reporters/base-reporter.js       | 5 ++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/__tests__/reporters/base-reporter.js b/__tests__/reporters/base-reporter.js
index 53a45e3ed7..636e27f954 100644
--- a/__tests__/reporters/base-reporter.js
+++ b/__tests__/reporters/base-reporter.js
@@ -113,3 +113,9 @@ test('BaseReporter.disableProgress', () => {
   reporter.disableProgress();
   expect(reporter.noProgress).toBeTruthy();
 });
+
+test('BaseReporter.termstrings', () => {
+  const reporter = new BaseReporter();
+  const expected = '"\u001b[2mjsprim#\u001b[22mjson-schema" not installed';
+  expect(reporter.lang('packageNotInstalled', '\u001b[2mjsprim#\u001b[22mjson-schema')).toEqual(expected);
+});
diff --git a/src/reporters/base-reporter.js b/src/reporters/base-reporter.js
index 722158d914..b65bff3e67 100644
--- a/src/reporters/base-reporter.js
+++ b/src/reporters/base-reporter.js
@@ -37,7 +37,10 @@ export function stringifyLangArgs(args: Array<any>): Array<string> {
       return val.inspect();
     } else {
       try {
-        return JSON.stringify(val) || val + '';
+        const str = JSON.stringify(val) || val + '';
+	// should match all "u001b" that follow an odd number of backslashes and convert them to ESC
+	// we do this because the JSON.stringify process has escaped these characters
+        return str.replace(/((?:^|[^\\])(?:\\{2})*)\\u001[bB]/g, '$1\u001b');
       } catch (e) {
         return util.inspect(val);
       }