fix(mapper): specs fail in win32 due to double slash notation

src/config/getOsPath.spec.ts

@@ -0,0 +1,11 @@
+import { getWinPath } from './getOsPath'
+
+describe('getWinPath', () => {
+  it('returns win32 paths on windows', () => {
+    const input = `C:\\\\Users\\travis\\build\\kulshekhar\\ts-jest\\src\\config\\__helpers__\\project-1`
+
+    expect(getWinPath(input)).toMatchInlineSnapshot(
+      `"C:\\\\\\\\Users\\\\\\\\travis\\\\\\\\build\\\\\\\\kulshekhar\\\\\\\\ts-jest\\\\\\\\src\\\\\\\\config\\\\\\\\__helpers__\\\\\\\\project-1"`,
+    )
+  })
+})

src/config/getOsPath.ts

@@ -1,7 +1,12 @@
 import * as path from 'path'
 
-export const getOsPath = (...paths: string[]): string => {
+const MatchWinSeparator = /(?<!\\)(\\)(?!\\)/gm
+
+export const getWinPath = (...paths: string[]): string => {
   const joinedPath = path.join(...paths)
 
-  return process.platform === 'win32' ? joinedPath.replace('\\', '\\\\') : joinedPath
+  return joinedPath.replace(MatchWinSeparator, '\\\\')
 }
+
+export const getOsPath = (...paths: string[]): string =>
+  process.platform === 'win32' ? getWinPath(...paths) : path.join(...paths)