cross platform fix paths in fixFontPaths

Signed-off-by: shmck <shawn.j.mckay@gmail.com>

Author: ShMcK

scripts/fixFontPaths.js

@@ -3,11 +3,12 @@
  * in order to load fonts and icons, these paths must be reconciled.
  */
 const fs = require('fs') // eslint-disable-line
+const path = require('path') // eslint-disable-line
 
 // find the generated main css file
 const getMainCSSFile = () => {
   const regex = /^main.[a-z0-9]+.chunk.css$/
-  const mainCss = fs.readdirSync('build/static/css').filter((filename) => filename.match(regex))
+  const mainCss = fs.readdirSync(path.resolve('build/static/css')).filter((filename) => filename.match(regex))
   if (!mainCss.length) {
     throw new Error('No main.css file found in build/static/css')
   }
@@ -17,10 +18,10 @@ const getMainCSSFile = () => {
 // remap the font paths from the borken /fonts/ => ../../fonts/
 const remapFontPaths = () => {
   const mainCSSFile = getMainCSSFile()
-  const file = fs.readFileSync(`build/static/css/${mainCSSFile}`, 'utf8')
+  const file = fs.readFileSync(path.join('build/static/css', mainCSSFile), 'utf8')
   const fontUrlRegex = /url\(\/fonts\//g
   const remappedFile = file.replace(fontUrlRegex, 'url(../../fonts/')
-  fs.writeFileSync(`build/static/css/${mainCSSFile}`, remappedFile)
+  fs.writeFileSync(path.join('build/static/css', mainCSSFile), remappedFile)
 }
 
 remapFontPaths()