Switch to more robust existing CSS escaping library

__tests__/escapeClassName.test.js

@@ -0,0 +1,5 @@
+import escapeClassName from '../src/util/escapeClassName'
+
+test('invalid characters are escaped', () => {
+  expect(escapeClassName('w:_$-1/2')).toEqual('w\\:_\\$-1\\/2')
+})

package.json

@@ -43,6 +43,7 @@
   },
   "dependencies": {
     "commander": "^2.11.0",
+    "css.escape": "^1.5.1",
     "fs-extra": "^4.0.2",
     "lodash": "^4.17.5",
     "perfectionist": "^2.4.0",

src/util/escapeClassName.js

@@ -1,3 +1,5 @@
+import escape from 'css.escape'
+
 export default function escapeClassName(className) {
-  return className.replace(/([^A-Za-z0-9\-])/g, '\\$1')
+  return escape(className)
 }

yarn.lock

@@ -1246,6 +1246,10 @@ cross-spawn@^5.0.1, cross-spawn@^5.1.0:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
+css.escape@^1.5.1:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/css.escape/-/css.escape-1.5.1.tgz#42e27d4fa04ae32f931a4b4d4191fa9cddee97cb"
+
 cssom@0.3.x, "cssom@>= 0.3.2 < 0.4.0":
   version "0.3.2"
   resolved "https://registry.yarnpkg.com/cssom/-/cssom-0.3.2.tgz#b8036170c79f07a90ff2f16e22284027a243848b"