feat: make injection optional

Author: Justineo

.stylelintignore

@@ -1,2 +1,3 @@
 test
 dist
+*.js

package-lock.json

@@ -31,7 +31,7 @@
     "eslint": "^5.16.0",
     "eslint-config-prettier": "^4.3.0",
     "eslint-config-standard": "^12.0.0",
-    "eslint-plugin-import": "^2.17.3",
+    "eslint-plugin-import": "^2.22.0",
     "eslint-plugin-node": "^9.1.0",
     "eslint-plugin-promise": "^4.1.1",
     "eslint-plugin-standard": "^4.0.0",
@@ -40,6 +40,7 @@
     "kolor": "^1.1.9",
     "less": "^3.9.0",
     "lodash.camelcase": "^4.3.0",
+    "lodash.memoize": "^4.1.2",
     "pkg-dir": "^4.2.0",
     "postcss-values-parser": "^3.0.4",
     "prettier": "^1.17.1",

package.json

@@ -27,6 +27,10 @@ class Injector {
   }
 }
 
-export default function inject (less, pluginManager) {
-  pluginManager.addPreProcessor(new Injector())
+export default function inject (_, pluginManager) {
+  const { inject = true } = this.options || {}
+
+  if (inject) {
+    pluginManager.addPreProcessor(new Injector())
+  }
 }