feat: dont print escape backslash on strings containing escaped backs…

…lashes (#401)

* feat: dont print escape backslash on strings containing escaped backslashes

* fix: changing replace to work on node 14

* fix: grammar issues

lib/utils.js

@@ -405,16 +405,21 @@ function prettifyObject ({
       result += colorizer.greyMessage(stringifySafe(plain))
     }
     result += eol
+    // Avoid printing the escape character on escaped backslashes.
+    result = result.replace(/\\\\/gi, '\\')
   } else {
     // Put each object entry on its own line
     Object.entries(plain).forEach(([keyName, keyValue]) => {
       // custom prettifiers are already applied above, so we can skip it now
-      const lines = typeof customPrettifiers[keyName] === 'function'
+      let lines = typeof customPrettifiers[keyName] === 'function'
         ? keyValue
         : stringifySafe(keyValue, null, 2)
 
       if (lines === undefined) return
 
+      // Avoid printing the escape character on escaped backslashes.
+      lines = lines.replace(/\\\\/gi, '\\')
+
       const joinedLines = joinLinesWithIndentation({ input: lines, ident, eol })
       result += `${ident}${keyName}:${joinedLines.startsWith(eol) ? '' : ' '}${joinedLines}${eol}`
     })

test/lib/utils.public.test.js

@@ -270,6 +270,16 @@ tap.test('prettifyObject', t => {
     t.equal(str, '    foo: "bar"\n')
   })
 
+  t.test('ignores escaped backslashes in string values', async t => {
+    const str = prettifyObject({ input: { foo_regexp: '\\[^\\w\\s]\\' } })
+    t.equal(str, '    foo_regexp: "\\[^\\w\\s]\\"\n')
+  })
+
+  t.test('ignores escaped backslashes in string values (singleLine option)', async t => {
+    const str = prettifyObject({ input: { foo_regexp: '\\[^\\w\\s]\\' }, singleLine: true })
+    t.equal(str, '{"foo_regexp":"\\[^\\w\\s]\\"}\n')
+  })
+
   t.test('works with error props', async t => {
     const err = Error('Something went wrong')
     const serializedError = {